US2348146A - Telegraph signal translating system - Google Patents

Description

y 1944. M. POTTS 2,348,146

TELEGRAPH SIGNAL TRANSLATING" SYSTEM Original Filed NOV. 15, 1940 5 Sheets-Sheet 1 n s H U m m v P T wn t w. m M W mh wv V S wv 5 mm m m wNv TELEGRAPH SIGNAL TRANSLATING SYSTEM Original Filed Nov. 15, 1940 5 Sheets-Sheet 2 FI G.2

INVENTOR. LOUIS M. POTTS j I... M. POTTS 2,348,146

May 2, 1944; L. M. POTTS 2,348,146

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v L. M. POTTS TELEGRAPH SIGNAL TRANSLATING SYSTEM ori inal Filed Nov. 15, 1940' 5 Sheets-Sheet 5 R mm W m E vM w W A m 0 L Y B W Nvm mm b m5 1 Sn 3m Patented May 2, 1944 TELEGRAPH SIGNAL TRANSLATING SYSTEM 7 Louis M. Potts, Evanston, Ill., assignor to Tele- 1 type Corporation, Chicago, 11]., a corporation of Delaware Original application November 15, 1940, Serial No. 365,730. Divided and this application November 9, 1942, Serial No. 464,994 1 16 Claims.

This invention relates to printing telegraph apparatus and systems and particularly to translating mechanisms for translating signal combinations according to one code into signal combinations according to another code.

This application is a division of copending application Serial No. 365,730; filed November 15, 1940', which matured on August 24, 1943, into Patent No. 2,327,369.

An object of this invention is to make possible the use of a keyboard transmitter operable according to one telegraph code and a recorder operable according to a different telegraph code to produce a complete station which includes simpler components than a station having a transmitter and recorder both operable according to the sam one of either of the codes.

Another object of the invention is to make possible the use of stations comprising transmitters operable according to one code and recorders operable according to a diiferent code in a telegraph exchange system including stations having transmitters and recorders both operable according to one of the codes, with full flexibility of intercommunication between any two stations associated with said exchange system.

Another object of the invention is to provide a printing telegraph station comprising a permutation code transmitter and a facsimile recorder interconnected through a remotely located translator whereby a printed facsimile record will be made of message material transmitted by permutation code signals.

According to one embodiment of the invention permutation code signals are received by a single magnet printing telegraph receiving. selector mechanism and slides are operated permutatively in accordance with the received signal combination to produce selectively apertures between a source of light and a scanning cylinder which houses a photoelectric cell and which has circumferential combinations of light transmitting and opaque areas according to the facsimile signaling code. Upon the reception of a permutation code signal combination and the setting of the slides, the scanning cylinder is set in rotation for one revolution. Facsimile telegraph signals are then generated according to the activation of the photoelectric cell under the control of the scanning cylinder.

According to another embodiment of the invention the permutation code signals are received by a multiple magnet receiving selector mechanism which has a selector magnet corresponding to each element of the code. Each of the selector magnets controls the positioning, of one of the slides which cooperatively establish individual apertures for alight beam to be scanned by the scanning cylinder. As'in the case of the first mentioned embodiment of the invention, the scanning cylinder is set in rotation for one revolution upon the reception of a permutation code signal combination bythe multiple magnet receiving selector mechanism.

The invention features a communication system including translating devices of the single magnet or multiple magnet controlled type whereby intercommunication may be had between a subscriber having. a permutation code transmitter and facsimile recorder and a subscriber having permutation code transmitter and recorder, or between two subscribers having permutation code transmitters and facsimile recorders. The invention also features communication systems for providing intercommunication between a central station and a plurality of subordinate stations and operable over metallic conductors or radio channels, ,said communication systems including translating devices as hereinbefore described generally and to be described hereinafter in detail for translating permutation code signals into facsimile signals.

For a complete understanding of the invention reference may be had to the following detailed description to be interpreted in the light of the accompanying drawings wherein,

Fig. 1 is a plan viewpartly' broken awayshowing a signal translating device operable under the control. of magnets individual to each impulse of a received signal combination;

Fig. 2 isa perspective view partly broken away showing structural details of the signal translating device shown in Fig. l;

Fig. 3 is an elevationalviewof the translating device shown in Fig. l;

Fig. 4 is a plan view partly broken away showing a modified formof signal translating device which is operable under the control. of a single receiving magnet;

Fig. 5 is an elevational viewpartly broken away taken at. the right-hand side "of Fig; 4;

Fig. 6 is an. elevational view taken at thelower edgeofFig..4;-:I .T

Figs. 7- and 8; when. placed end to'iend with Fig. 8 at the right' of Fig. 7, show a complete communication system including signaltranslating devices according to the previously identified figures; if 'f I. i I

Fig. 9 is a schematic wiring diagram of a communlcation system including signal translating numeral l6 indicates generally the signal generating mechanism of a photoelectric facsimile transmitter such as that shown in co'pending application Serial No. 261,4l8 filed March 13,

1939, by L. M. Potts, which matured on No-- vember 25, 1941, into Patent No. 2,263,592. Patent No. 2,263,592 discloses a keyboard controlled transmitter and keyboard, control is not of. interest in,connection with the present vention. Patent No. 2,263,592 for a detailed description of the photoelectric scanning and facsimile signal generating mechanism. 7

fl-he signal generating mechanism I6 includes a housing-l1 into which extends. from one end a etatable shaft l8. The end of shaft |8 presented inside cylindrical housing supports aiid has secure'd thereto by means of set screw |9a rotatablescanning cylinder 28. As shown in the Patent No. 2,263,592, cylinder 20 has circumferential rows of light transmitting aperturesor windows arranged according to the facsimile code of impulses for letters, figures, and symbols. The opposite ends of seamin cylindefc 20" and housing cylinder I! from that where shaft |8 enters-is open and the base 25' of a photoelectric cell 2| is. stationarily suppoztd ilith dpn end Of the housing cylinder i1. Photoelectric cell 2| is of'the elongated cylindrical type and has its cathode and anode at least coextensive with the portion of scanning cylinder 20 which has circumferential bands of scanning apertures.

*At apoint; just. clear o'f'the surface of scanning cylinder 20 the housing cylinder I1 is cut away on a vertical plane and to theflat surfaces resulting from the cutting away of the portion of thecylinder a guide. frame 22 for shutter slides is secured, as shownlin Fig.. 1. The guide frame 22 is 'shownin detail inFi'g. 2 by reference-to whichitwill be noted that the frame has a channel"23in.whichiaplurality of shutter I slides 24 are slidably. supported. The slides 24 are" 'onfined in .channel.23 by plate 26 which is securedfto the :inner facesJof. frame 22, and when the frame 'is "secured to housing cylinder l1, plate 'ZBidis'posedbetWeenthe frame and the flat surfacesprovidedlby cutting away aportion of the cylinder |'|.I Retainer plate 26 is provided with light transmitting apertures 21, there being an aperture 21. in alignment with each of the circumferential rows of. light trans mittingwindows or aperturesofrotatably scanning cylinder 28'. The apertures 21 are arranged intwo rows in staggered formation in order to minimize the space required for the full setiof apertures. g

The; slides 24 are movable endwisev individually' into "either or two positions. which may be designated as a marking and spacingposition. They are; provided with apertures. 28 arranged in twoirows spaced according. to;-the spacing of the rows of apertures ,21',.and the spacing of the apertures, 28..fr.o'm.-each other in each row is such that certain of the apertures will register'with apertures 2:l ,when theslideis in. the markin position and? others will: register with apertures However, reference may be had to the which supports apertured plate 26 there is a longitudinally extending slot 29 across which is titiolis 3 l disposed a plurality of vertically positioned par- The spacing of the partitions 3| corresponds to the spacing of apertures Tl longitudinally of plate 26 so that the partitions 3| define the entrances of light passages which may be completed through alignment of apertures 28 in slides 24' and through apertures 21. 'A- lamp 312. having a IOng filament 33 is mounted -in close proximity to the slot 29 in frame 22 (Fig; l) and serves as a source of light to be scanned by the rotatable cylinder 20 for activating the' photoelectric cell. 2| in accordance with the facsimile code of apertures in the cylinder 2|! which maybe exposed tothe' light as a result of the permutational positioning of slides 24.

' Shaft |8 which carries scanning cylinder 28 is rotatably supported in one end. 'of stationary cylinder l1 and remotely therefrom in bracket 36. Shaft I8 has secured thereto sleeve 31 to which is s'lidably splined' driven. element 38 of a positive clutch mechanism. Driven clutch element 38 isurg'e'd; by compression spring 39 to move longitudinall'y'of shaft |8"to engage" driving element 4| which is sleeved on shaft I8; A gear 42 is secured to driving clutch element 4| and a motor driven pinion 43 meshes with and imparts continuous rotation togear'42 and through it to driving. clutch element. 4 I

Driven clutch" element 38 is normally restrained from engagement with driving element 4-l'by clutch throwoutleyer 44 urged by tension spring 46. into'the' path of clutch throwout cam 41f associated with. flange. 48 of driven clutch "element 38.

sleeve3'l'hasisecured thereto a cam 5| which is engagedby a roller 52. carried by a lever arm 53' which is spring biased' to maintain roller 52 in engagement. with cam 5|. When the clutch mechanismis in rest condition the roller 52 is restingl upon cam 5| near the top of. a descendirig. slope. thereof, andthus. imparts a torque to the cam and thus to sleeve3'l and driven clutch element 38 to hold them in such angular position that clutchthrowoutz lever 44 pulls driven clutch elelnent;38. entirely: out of engagement with driving-i element 4|, andv rubbing of the teeth. ofoneclutch element upon those of the other. is avoided;

Clutch throwout lever '44 is provided with a leftwardly extending arm: 56 which terminates b'elowandlinthe"path ofone arm of a clutch tripping lever STI'TpiVOte'dat' 58. A downwardly extendin 'afmTEQ of. clutch tripping lever 51 is disposedgin the pathof a'hooked portion 6| of a"link.62 which. is movable rightwardlyto rock clutcht'ripping lever 51 counterclockwise to effect the withdrawal 'of clutch throwout lever 44' from engagement with clutch throwout cam 41 whereby compression spring 39 may move driven clutch element 38 into engagement with drivin element 4| to'receive rotation therefrom and thus impart rotation to shaft l8 and scanning cylinder 28.; Shaft IB' is rotated; throughone revolution whereupon driven clutch element 38-isdisengaged fromjcl-riving element 4| by the re=engagement of clutch throwout lever 44 with cam 41 and. shaft I8 and scanning cylinder 20 are brought to rest. The cooperation of link 62 with clutch tripping lever 51 is Of the nonrepeat species due to the downward camming of link 62 as it is moved rightwardly by virtue of engagement of an upwardly sloping cam portion of the upper edge of link 62 with the head of screw 63. A tension spring 64 maintains the upper edge of link 62 in engagement with the head of screw 63. The apparatus thus far described is fully disclosed in the hereinbefore identified application.

The bracket 36 which supports the right-hand end of shaft I8 also supports on the right-hand, side thereof the mounting brackets 66 for a plurality of selector magnets 61. The number of selector magnets 61 is equal to the number of impulses in the permutation code combination that the selector mechanism is adapted to receive and each selector magnet is provided with a pivoted armature 68. Each of the armatures 68 is provided at its free end with an adjustable abutment screw 69 which is aligned with the right-hand end of an associated slide II. Slides II are slidably supported in bracket 36 and each is urged to its rightward or spacing position by a tension spring I2.

Each of the slides 'II is connected by a rod I3 to a shutter slide 24 so that when any one of the slides II is moved to its left-hand or marking position its associated shutter slide 24 is correspondingly positioned. The slides II are provided with locking projections I4 and arm 53 which carries cam follower roller 52 supports a locking bail blade I6 which spans the slides II adjacent to the locking projections 14. Slides II which are in spacing or right-hand positions have their locking projections 14 presented to the right of locking bail blade 16, and those that are presented in their marking or left-hand position have their locking projections presented to the left of the locking bail blade I6. When shaft I8 begins to rotate, cam 5I lowers arm 53 so that the locking blade I6 is presented between those of the locking projections I4 that are to the right of it and those that are to the left of it. Thus, the slides II are blocked against movement until near the end of a cycle of rotation of shaft I8 when cam 5| lifts arm 53 to lift looking bail blade I6 clear of the top of locking projection I4.

Each of the slides II has a lug TI on the lower edge thereof (Fig. 3) and disposed in the path of the lugs 11 is a bail I8 pivoted at I9. Bail I8 has a depending arm BI to which the right-hand end of clutch tripping link 62 is pivotally connected. When any of the slides 'II is moved to its marking position by its associated selector magnet 61 the lug 11 will engage bail I8 and rock the bail in counterclockwise direction, thus shifting link 62 to the right to effect the tripping of the clutch comprising driven-element 38 and driving element 4|. From this it will be apparent that all of the selector magnets 61 that are to be energized for any given permutation code signal combination must be energized substantially simultaneously rather than in succession from a receiving distributor. The reason for this is that the first slide II to be operated would effect the tripping of the clutch for driving shaft I8 through the operation of bail -18, link 62, clutch tripping lever 51, and clutch throwout lever 44, and the slides II would become. lockedby the lowering Of locking bailv blade I6 before the remaining markingimpulses in the code combination could be received and perform their selective functions. The translatin device shown in Figs. 1 to 3, inclusive, is particularly adapted to operate in a system in which each of the selector magnets 61 is connected by an individual conductor to one of the transmitting contacts .of the transmitter mechanism. A system so arranged will be described later. 8 Figs. 4 to 6, inclusive, show that form of the invention which includes a single magnet receiving selector mechanism for controlling the operation of the photoelectric permutation code transmitter. The photoelectric scanning and facsimile signal generating mechanism is identical with thatshown in Figs. 1 to 3, inclusive, and the same reference characters have beenapplied thereto. Also, the driving mechanism for the scanning drum and the combined clutch antisingingdevice and lock bail for the slides which control the light valve slides are identical with those heretofore described and are identified by the same reference numerals.

The receiving selector mechanism for controlling the operation of' the light valve slides 24 is similar to that shown inPatent No. 1,937,376,

granted November 28, 1933, to W. J. Zenner. The

reference numeral 8| designates a mounting plate for the selector mechanism. A selector magnet assembly comprises a bracket 82, to which is secured by means of screws 83 a magnet core '84. Core 84' has two, arms, each of which supports a winding 86, which is connected to a telegraph line. At their outer end, the arms of core '84 terminate in pole faces 81. Bracket 82 supports opposed pivot screws 88, which in turn pivotally support an armature lever 89. Armature lever 89 has rigidly secured thereto armature 9| which is disposed in alignment with the pole faces 81. The other end of armature lever 89 terminates in a cam follower portion .(not shown),: which cooperates with an armature lever cam 92 included in a receiving selector cam assembly 93. Selector cam'assembly 93 is driven from gear 42 through a sleeve 94, which has a reduced portion rotatably supported in bracket .36. Cam assembly 93'is sleeved on sleeve 94 and is provided at its opposite ends with discs 99. To the. right of cam assembly 93 sleev 94 has disc 91 secured thereto, and to the left of cam assembly'93 disc 98 is splined on sleeve 94 and is slidable thereon. A friction disc of resilient material, such' as felt, is interposed between the disc 96 and the disc 91 at the right of receiving cam assembly 93, and another friction disc is interposed between the disc 94 and 96 at the left of cam assembly 93, the friction discs being identified by the numeral 99. A compression spring IEII urges disc 98 rightwardly of sleeve 94 and compresses friction discs 99, between their adjacent discs. Discs 96, 91, 98, and 99 form a friction clutch through which rotation may be imparted to cam assembly 93 from continuously driven sleeve 94.

Selector cam assembly 93, includes a stop arm I92 which is arranged to be arrested and released for rotation alternatively under the control of a stop gate I02 included in stop gate as-' sen1blyi94. Stop gate assembly N14 has as its foundation a plate I06, which is pivoted below a plate I91 by means of pivot screw I98, carried by plate I91, which is supported by posts I99 mounted on mounting plate BI. An arm III, mounted on pivot screw I68 above plate I07, has extending thereto the shank of a knurled-headed screw I I2 which threadedly engagesstop gate mounting plate I06. Plate I 06 maybe adjusted pivotally 'for orientation adjustment about pivot screwi'I08 and maybe clamped in anydesired position of adjustment by drawing plate I06 and'arm III into clamping engagement with plate TIO'I by means of screw II2. j "T I Stop gate I03 is pivotally mounted on. a stud carried by plate I06 and is biased into the path of stop arm I02 by a spring (not shown). Stop gate I03 may be latchedin blocking relation to stop arm I02 by shouldered latch lever" H3. Lever H3 is pivotally mounted on the underside of plate I06 and is urged by spring I I4 into latching engagementwithstop gate I03.

Latch lever H3 is rocked against the resist ance of compression spring I I4 to lift its shoulder out of latching engagement with the stop jgate by a plunger pin H9, in the operating path of which is disposed one arm of a bell crank lever N1, the other arm of which engages latch lever II3. A plunger operating screw II8, carried by extension II9 of armature lever 89 in alignment with plunger pin IIB, shifts the pin to effect the release of the stop gate when selector magnet 86 is de-energized and armature 9I is retracted. Plunger pin H9 is retracted by spring H4 and permits latching lever II3 to latch stop gate I03 when armature 9| is in engagement with pole faces 81.

The selector lever assembly comprises a mounting bracket I2I, secured to mounting plate 8| by screws I22, and a selector lever I23 pivotally supported by bracket I2I by means of pivot screws I24. The selector lever I23 becomes locked in extreme counterclockwise Or clockwise position (Fig. which are the marking and spacing positions respectively, by a lock lever I26 (Fig. 5), which is released by a cam included in receiving cam assembly 93 in timed relation to the reception of each impulse of a signal combination. As timed by the operation of lock lever I26, the selector lever I23 follows the movement of armature lever 89, being shifted to spacing position by an abutment screw I21 carried by armature lever 89 and being shifted to marking position by a tension spring (not shown) by which selector lever I23 is connected to armature lever 89. V

Selector cam assembly 93 is provided with cam projections I28, equal in number to the number of impulses in a code combination forindividually actuating sword lever bell cranks I29 (Fig. 5) to move sword lever I3I individually articulated to the sword lever bell cranks I29 leftwardly as viewed in Fig. 5. Adjacent to the point of articu-' tion of a sword lever I 3i by its bell crank I 29 and. engagement of the laterally extending arm with one of the depending arms I 32 of selector lever I23 before the sword lever has reached the limit of its travel, it will be rockedin clockwise or counterclockwise direction, depending upon whether the selector lever I23 is in marking or spacing position. The end of each sword lever I 3I,'oppo'site to that which is engaged by the sword lever bell crank I29, is pointed and normally engages a T-lever individual to the sword lever at one side or the other of adivide between two sloping surfaces of the T-lever. The T-levers, identified by the reference numeral I33 in Fig. 5, are pivotally supported upon a spindle I34. The sword levers I3I actuate their associated T-levers I33 to extreme clockwise or counterclockwise position, depending upon'whether the sword lever is in extreme counterclockwise or extreme clockwise position respectively, when'they are restored to engagement with their associated T-levers after having been retracted to cooperate with selector lever I23. Each T-lever is provided with an arm I39 for articulation to a permutation member to be controlled by the T-lever. The single magnet receiving selector mechanism, as described up to this point, is substantially identical with that shown in Patent 1,937,376.

The T-levers I33 control intermediate or transfer levers I4i that are bail-shaped. The levers I4I are nested. and are pivotally mounted upon pivot rod I42. One of the arms of each of the levers I4! is bent outwardly, as shown at the top of Fig. 4 and at the right of Fig. 5, at right angles to the arm and then upwardly, and near the extremity of the upwardly bent portion is a recess in which is disposed the disc-shaped extremity I31 of arm I36 of Tlever I33. The other arm of each of the bail-shaped levers I4I, shown near the middle of Fig. 4 and at the left of Fig. 5, has an upwardly extending projection I43 which terminates in a disc-shaped portion I44. Each of the disc-shaped extremities I44 of the upstanding arms I43 of levers MI is disposed in a socket at the lower end of a depending arm I-iiiintegral'with one of the slides I41 similar to the slides H of Figs. 1 to 3, inclusive, and similarly connected by rods I3 to light valve slides 24.

Upon the reception of a start-stop permutation code signal combination, the receiving selector mechanism is operated, as fully disclosed in Patent 1,937,376 to effect the permutational setting of the T-leve'rs I33 in accordance with the code combination. As the T-levers I33 are rocked to' extreme clockwise or counterclockwise position, the righthand ends of the outer arms of levers I4I, as viewed in Fig. 4, are rocked downwardly or upwardly, respectively, and the levers I41 are rocked clockwise or counterclockwise; respectively, as viewed in Fig. 6, to shift the slides I4? to extreme right-hand or left-hand position, respectively.

In addition to the cam projections I28 for operating the sword lever bell cranks I29, the selector cam assembly 93 is provided with a clutch tripping cam projection I 5|; which, near the end of a cycle of operation of selector'cam assembly 93, engages arm E52 of clutch throwout lever I53, pivoted at I54, to lift its clutch controlling arm I56 out of engagement with clutch throwout cam 41 to permit compression spring 39 to move driven clutch element 38 into engagement with driving element 4I. Thus, rotation is imparted to the light beam scanning cylinder contained in cylindrical housing I! to effect the transmission of a facsimile code signal combination corresponding to the character represented by the received permutation code combination. As cam 5i is rotated with the scanning cylinder, locking bail I9 is lowered into blocking relation to'the locking projections I4 of the slides I41. Upon thecompletion of one revolution of the scanning cylinder, locking bail 16 is lifted to permit the resetting of the slides I41 according to a new code signal combination and the clutch comprising elements 38 and M may be disengaged momentarily by arm I56 of clutchthrowout lever I53 to arrest correspondingly the scanning cylinder.

It will be noted that in the embodiment of the invention shown in Figs. 1 to 3, inclusive, six receiving selector magnets and six slides 1I controlled thereby are provided. This apparatus is operable upon a sixunit code which affords a maximum of sixty-four signal combinations, which is adequate for letters, figures, punctuation marks and other symbols. However, it will be noted that in the embodiment of the invention shown in Figs. 4 to 6, inclusive, referring particularly to Fig. 4, only five T-levers I33 and five bail-shaped levers I4I have been provided, which indicates that the apparatus is operable'in response to the very commonly employed fiveunit permutation code. This code affords a maximum thirty-two primary selective combination. However, as is well known, by allotting two of the code combinations to shift and unshift function, the code may be expanded i to accommodate all necessary letters, figures, punctuation and other symbol selections. Accordingly, a'sixth slide bar, designated by the reference numeral I51, and similar to the slide bars I41 is provided. The slide bar I 51 is connected to the sixth one of the light valve slides 24 by a rod 13 in the same manner as are the other slides designated I41. The sixth light valve slide in the embodiment of the invention shown in Figs. 4 to 6, inclusive, functions in exactly the same manner, as far as the transmission of facsimile combinations is concerned, as doesthe sixth light valve slide in Figs. 1 to 3. The difference is only in the method of controlling the sixth light valve slide and this difference is that in Figs. 1 to 3, the sixth slide is presented in one or the other of its two positions in accordance with the presence or absence in a signal combination of an impulse to operate the sixth magnet,

Referring to Fig. 6, it will be noted that in the lower edge of the foremost of the slide bars I41 controlled by the bail-shaped levers I4I two notches are provided. Each of the other of the five slide bars I41 is notched and the positioning of the notches on the bars is according to the permutation code so that when slide bars I41 have been positioned under the control of the receiving selector mechanism in accordance with a shift code' combination, an alignment of notches will result in one position and, when the slidebars I 41 have been set in accordance with the unshift code combination, an alignment of notches will result in the other position. Below the slide bars I41, and in registry with the position in which the alignments of notches may result, are selectable bails I6I and I 62 carried by levers I63 and I64, respectively, pivoted at I66 and I61, respectively. Each of the levers I63 and I64 has a downwardly extending arm and the extremities of the two arms are interconnected by a tension spring I66 which biases lever I63 in counterclockwise direction and lever I64 in clockwise direction. The levers I63 and I64 have fingers I69 extending toward each other and the extremities of the fingers I69 are disposed under oppositely extending flanges, I1I, carried by a retracting lever I12, pivoted at I13. Retracting lever I12 has an'arm I14 extending upwardly fromthe point of the pivotal mounting, with its extremities disposed in the path of arm I16 of locking bail lever 53. I

When cam 5| operates lever 53 to lift locking bail 16 out of locking position, it accomplishes this by rocking lever 53 clockwise, and arm I16 thereof rocks retracting lever I12 counterclockwise, with the result that the flanges I1I engage fingers of I 63 and I64 and draw the selectable bails I6I and I62 clear of the lower edges of the slide bars I41. Thus, the selectable bails I6I and I62 are prevented from interfering with the setting of the slide bars I41 according to received signal combinations. When locking bail lever 53 returns to normal position, which is the extreme counterclockwise position, as viewed in Fig. 6, it permits lever I12 to rotate in clockwise direction, this rotation being imparted by spring 168 operating through levers I63 and I64 and their opposed fingers upon flanges I1I. If the setting of the slide bars I41 represents neither the shift nor the unshift combination, both of the selectable bails I6I and I62 will come to rest against the lower edges of the slide bars I41. However, if either of the selectable bails finds an alignment of notches, it will enter the alignment of notches, thus moving lever I12 farther in clockwise direction than it is moved when neither of the selectable bails finds an alignment of notches.

Lever I63 is provided with an upwardly extending arm I8I and lever I64 is provided with a similar upstanding lever I82. The arms I8I and I62 of levers I63 and I64, respectively, are positioned adjacent to the sixth slide I51, and each of the lever arms has a laterally bent portion at its.

upper end which overlies the slide I 51. Slide I51 is provided on its upper edgewith a pair of spaced lugs I83 at its upper edge between which the laterally extending portionof arm I8I of lever I63 is disposed. 7 Similarly, slide I51 is pror vided with spaced lugs I84 betweenwhich the laterally extendingportion of arm I 82 of lever I64 is disposed. When lever I63 occupies its extreme counterclockwise position with its sensing .bail I6I in an alignment of notches in the five slides I41, the laterally extending portion of its arm I 8I has engaged the left-hand of the lugs I83 and has shifted slide I51 to its left-hand position, whereby the associated light valve slide is shifted to extreme left-hand position to block out-light from one entire set of circumferential rows of code apertures on cylinder 20, such set of rows of apertures being those assigned either to figures characters or to latters character's. However, when lever I64 isin extreme'clockwise position with its sensing bail I62 disposed in an alignment of notches in the slides I41, the transversely extending portionof its arm I8I will have engaged the right-hand one of the lugs I84 and will have shifted slide I51 to. its extreme righthand position, whereby the sixth light valve slide will be presented in extreme right-hand position to block out light from all of the circumferential rows of apertures which were unblocked when the slide I51 was in extreme left-hand position and to unblock those sets of apertures which were then blocked.

Lever I12 is biased in counterclockwise direction by a light tension spring I86 so that when looking bail lever53 is in extreme counterclockwise position, as viewed in Fig. '6, and its depending arm- I16 at the right-hand end has released the upper end of lever I12, the right-hand end of lever I12 will be under the control of fingers I69 of levers I63 and I64 and will not rise higher than either of those fingers move it, it being understood that spring I68 is stronger than spring I86 so that spring I68 will control the movement of lever I12.

At the upper end of the arm atthe right-hand end of lever I12 a slide I81 is pivotally connected thereto. Slide I81 is connected to a seventh light valve slide I88. Thus, when lever I12 is rocked counterclockwiseby'locking lever 53, slide I81 and light valve slide I88 aremoved to the left. Conversely, when lever-I I2 is rocked clockwise by spring I68, slides I81=and I88 are moved to the right, and depending on whether or not one of the sensing bails I61 and I62 enters an alignment of notches in slides I41, slide I01 and associated slide I88 will be presented in extreme or intermediate right-hand position.-

The purpose of light valve slide I08 is to nullify the effect of rotation of the scanning cylinder 20 in response to the shift and unshift signal combinations. Since, as is well known, a facsimile signal is a combination of impulses representing a character pattern and causes the character pattern to betraced on'the receiving medium, there is no case shift function corresponding to that which is employed when characters are printed by typed elements. Accordingly, no signal is to be transmitted in a cycle of operation of scanning cylinder 20 initiated as a result of the reception of a shift or unshift permutation code combination.

As disclosed in the Patent-No. 2,263,592 hereinbefore identified, the scanning cylinder 20 is provided with a light transmitting slot for the generation of a start signal located in an area on the periphery of the cylinder which includes no portion of any of the character signal transmitting code slots. Upon release of the scanning cylinder 20 for the transmission of any facsimile signal, the starting signal slot first scans the light beam and causes .the photoelectric cell to generate a signal for starting the receiving printer. Since no, signal is to be transmitted in response to the shift and unshift permutation code combinations, it is preferred that the scanning cylinder, which is released for rotation in response to the shift and unshift signal combinations in the same manner as for any other permutation code combinations,- shall not effect the generation of a start signal, since this would set the printer in operation and effect spacing of the receiving tape without recording anything in the space. The function of the slide I81 and its associated light. valve slide I88 i to block the light path in registry with the start signal slot of the scanning cylinder 20 when either of the selectable bails I6I or I62 is in the selected position. The blocking occurs when lever I12 is in extreme clockwise position, thus presentingslide I81 and light valve slide I88 in extreme right-hand position. At the points where apertures in the light valve slides 24 align when the slides are set according to the shift and unshift permutation code signals, there are no circumferential rows of apertures in the scanning cylinder 20. Thus, light is prevented from passing through the alignment of apertures in the light. valve slides 24 when the slides are set in accordance with the shift and un-shiftsignals and no impulses are generated in the photoelectric cell, the rotation of the scanning cylinder 20 being merely an idle operation applying no signals to the telegraph line and, therefore, having no effect on the receiving printer.

Referring now to Figs. 7 and 8, which, fitted together with Fig. 8 placed at the right of Fig. 7, show a complete telegraphic communication system, the reference letters A and B indicate subscribers stations. Subscribers stations A and B are identical and only one will be described in detail, which is the A station. At the subscribers station a facsimile recorder 20I is connected through the winding of relay 202 local to the station A to one end of telegraph line 203, the other end of which is connected to tip contact spring 204 of answering jack 206 at a central ofiice.

At the station A, a motor 201 is provided for driving the facsimile recorder 20I. One terminal of the motor 201 is connected directly to one side of a power line and the other terminal may be connected to the other side of the Power line through conductor 208, contact and tongue 209 of relay 202 and conductor 2 I I. Thus, when relay 202 is energized due to the transmission of facsimile signals from the central office over telegraph line 203, the circuit of motor 201 will be closed and facsimile recorder 20I will be driven. Relay 202 is preferably of the slow-to-release type so that its contact tongue will not operate in accordance with facsimile signals but will remain closed during the reception of signals to apply steady current to motor 201.

Station A is provided with a permutation code transmitter 2I2 which may be connected to a telegraph line 2 I3 through tongue 2I4 of key 2I6. Tongue 2I1 of key 2I6 completes the circuit for motor 201 which drives permutation code transmitter 2I2 as well as facsimile recorder 20I.

The other end of telegraph line H3 is connected to one end of one winding of a differential relay 2 I8 and this winding will be described for the sake of convenience as the upper winding. The other end of the upper winding of relay 2I8 is connected to tongue 2I9 of a relay 22I. The relays 2| 8 and 22I are located at the central station. When the system is idle, relay 22I is deenergized and its contact tongue 2I9 engages its back contact which is connected to one end of battery 222, the other end of which is connected to ground. Battery 222 supplies power for energizing the upper winding of relay 2I8 upon the closure of key 2I6 at subscribers station A, Key 2I6 is closed manually when the subscriber desides to operate permutation code transmitter 2 I 2 to transmit a message.

Upon the energization of the upper winding of relay 2I8, its tongue 223 which is connected to ground is brought into engagement with its front contact which is connected to one end of the winding of relay 224, the other end of which is connected to outer tongue 226 of relay 22I. Tongue 226 normally engages a back contact which is connected to a grounded battery 221. Upon the closure of energizing circuit for relay 224 at tongue 223 of relay 2I8, relay 224 attracts its contact tongue 228 which engages its front contact and completes a circuit for lamp 229 from battery 23 I.

Lamp 229 is associated with jack 206 and indicates to an operator at the central office that the subscriber at station A desires to transmit a message. The answering operator thereupon inserts plug 232 into jack 206. It will be understood that the operator could answer station B by inserting the same plug 232 into the jack associated with station B had the subscriber at station B closed his key l2l6 to effect the illumination of his jack lamp I229.

Upon the insertion of plug 232 into jack 266, plug tip 233 engages tip spring 204, outer ring 234 engages ring contact spring 236 of jack 286, inner ring 231 engages ring contact spring 238 of jack 286, and sleeve 239 engages bushing 24l'of jack 286.

The bushing 24! of jack 286 is connected to one end of the winding of relay 22l, the other end of which is connected to ground. Sleeve 239 of the plug, which engages bushing 24], is connected by a conductor 242 to one end of the winding 243, the other end of which is connected to one terminal of a grounded battery 244. Thus, upon the insertion of plug 232 into jack 286, relays 22| and 243 are energized in series. Relay 22l attracts its contact tongue 2l9 from engagement with back contact to engagement with front contact, attracts contact tongue 226 out of engagement with its back contact, thus interrupting the circuit for jack lamp controlling relay 224, and attracts its contact tongue 245 into engagement with a front contact. Contact tongue 245, upon engaging its front contact, completes the energizing circuit for the lower winding of 218 which neutralizes the efiect of the upper winding and releases contact tongue 223.

A further effect of the energization of relay 22! is that permutation code transmitter 2|2 is disconnected from battery 222 and is connected instead to outer ring contact spring 236 of jack '266. Since contact spring 236 is engaged by the outer-ring 234 of plug 232, the'circuit of the permutation code transmitter is extended to the operators cord circuit. This circuit includes conductor 246, winding of relay 241, key 255, conductor 25L winding of repeater relay 252, contact tongue 253 of repeater relays 254 and 256, front contact with which tongue 253 is normally engaged since relay 254 is normally energized, and grounded battery 251. A Y

Key 255 normally connects conductor 25! directly to the winding of relay 241 and holds relay 258 energized to complete acircuit from grounded local holding battery through operators keyboard transmitter 248 and permutation code printer magnet 249 to ground. Upon the operation of key 255, the circuit of relay .258 is opened so that the relay releases its'armatures and thus disconnects transmitter 248 and printer magnet 249 from the local holding battery. In make-before-break manner with respect to the circuit of relay 241, the key 255, when operated, also connects transmitter 248 and printer magnet 249 in series with relay 241 and with the repeater to which conductor 251 extends. With this arrangement, the operator may cut the transmitter 248 and receiver 249 into the permutation code communication circuit for setting up circuits desired by subscribers orfor-monitoring message transmission. Under normalconditions, when plug 232 is not inserted into any jack, the ground connection for maintaining holding current upon relay 252 of the repeater is obtained throughthe outer left-hand contact tongue 256 of a relay 252. This holding circuit includes the winding of relay 241, whichaswill presently appear, controls the operation of a translator mechanism, such as that shown in Figs. 4 to 6, inclusive. Upon the energization'of relays 22| and 262 the ground connection at the subscribers permutation code transmitter is sub-- stituted for the ground connection at the con-' tact tongue 250 of relay 262 so that permutation code signal transmission is initiated and the transmitter 2 l 2 will correspondingly energize and de-energize relay 241, operators receiving mag-.- net 249. and repeater relay 252.

In addition to the tongue 223, differential relay 2l8 has a contact tongue 225 connected to ground and engageable with a back contact when neither or both of windings of relay 2l8 are energized. The back contact is connected by conductor 238 to the jack spring 238 which is engaged by inner ring 231 of plug 232 from which conductor 26I extends to one end of the winding of relay 262, the other end of which is connected to battery 263. An energizing circuit for relay 262 is completed when bothwindings of relay 2l8 become energized and neutralize it to cause the release of tongue 225, and the relay 262 attracts its two left-hand and two right-hand tongues. The outer right-hand contact tongue 264 of relay 262 normally engages its back contact, to which is connected one'pole of battery 266, the other pole being connected to ground. The contact tongue 264 is connected by conductor 261 to one end of the winding of magnet 268, the other end of which is connected to ground. The broken lined rectangle in the upper righthand corner of Fig. '1, designated 210, is intended to represent diagrammatically a signal translating mechanism such as that shown in Figs. 4 to 6, inclusive, for translating frompermutation code signals into facsimile signals. The magnet 268 corresponds to the signal receiving selector magnet 86 of Figs. 4 and 6, inclusive. Magnet 268 is normally held energized by current supplied from. battery 266. However, upon the energization of relay 262, contact tongue 264 moves into engagement with its front contact which is connected to the contact tongue 269 of relay 241. The front contact with which contact tongue 269 is engageable is connected to a grounded battery 21l. Since in a static condition with the operators set rendered operative through the actuation of key 255, relay 241 is continuously energized, it being included in the holding circuit for operators receiving magnet 249, whether the holding circuit be extended from the ground at the contact tongue 250 of relay 262 or from the ground at the'permutation code transmitter of a subscribeds station, battery 21| will be connected to the front contact of contact tongue 264 of relay 264 through contact tongue 269 of relay 241. From this it will be apparent that receiving selector magnet 268 is not responsive to oscillation of tongue 269 of relay 241 except when relay 262 is energized to connect magnet 268 to the tongue 269 through contact tongue 264.

Upon the energlzation. of relay 262 its inner right-hand tongue 212 engages its front contact which is connected to conductor 26! and therefore is connected to the same ground as the winding of relay 262. Contact tongue 212 of relay 262 is connected to one end of one of the windings of a double wound relay 213, the other end of which is connected to grounded battery 214. Relay 213 is thus energized in parallel with relay 262, the circuit for the former extending through one of the contact tongues of the latter however, and the energizing circuit of both includes the retracted contact tongue 225 of relay 218.

The inner left-hand contact tongue 216 of relay 262 normally engages a back contact which i is connected to the front contact associated with the right-hand contact tongue 211 of relay 213. When contact tongue 216 is attracted into engagement with its front contact, a connection is established from ground to a conductor 218 at the other end of which one terminal of lamp 219 is connected, the other terminal of the lamp being connected to battery 281. The right-hand tongue 211 of relay 213 is connected. to a source of interrupted current indicated diagrammatically at 281. Thus, when relay 213 is energized, the interrupted current is available at the back contact associated with the inner left-hand contact tongue 216 of relay 262. When contact .tongue 216 engages the back contact and relay 213 is energized, lamp 219 will be illuminated intermittently or, in other words, will fiash for directing the attention of the operator to a particular operating condition. When contact tongue 216 engages its front contact, lamp 219 will be illuminated steadily. The left-hand contact tongue 282 of relay 213 completes a locking circuit through the left-hand winding of that relay, said circuit also including contact tongue 283 of relay 243 and normally closed key 284.

' Considering now the operation of the portion of the system in Fig. 7 thus far described, upon the closure of key 216 by subscriber A, the motor 201 for driving his transmitter 212 will be operated and the transmitter 2 I 2 will be connected to battery 222 at the central office through one of the Windingsof relay 218. Relay 218 will be energized and will disconnect ground from' con ductor 230 and close the circuit of relay 224 to connect battery 231 to lamp 229 which will become illuminated to indicate to the operator in charge of transmitter 248 and receiving printer 249 at the central office that subscriber A desires to transmit a message. The operator thereupon inserts plug 232 into jack 206 and actuates key 255 placing the operatorsset in a circuit with relay 241. Relays 221 and 243 thus become energized in series to complete the energizing circuit for the second winding of 213, to open the energizing circuit for delay 224, and to connect transmitter 212 through the upper winding of relay 218 in series with relay 241 and thus to operate receiver 249 and interrupt the connection to battery 222, these being the functions of relay 221.. Relay 243 prepares the locking circuit for relay 213.

Relay 218 being a differential relay which is in neutral condition when both windings are energized, releases its contact tongues, the lower of which has no immediate effect as the circuit of relay 224 is already opened at contact 226. The release of the upper contact tongue 225 results in the connection of ground to conductor 261,

whereby relay 262 becomes energized. The relay-262 operates to remove the local ground connection at contact tongue 250 from relay 241,

thus placing the relay under the control of transmitter 212 and subscribers station A, to complete a circuit for the steady illumination of lamp 219, to place the receiving selector magnet 268 in the translator mechanism under the control of relay 241 and to complete the energizing circuit for relay 213. The relay 213 upon being energized completes its own holding circuit and prepares for the flashing of lamp 219 by making connection .to the source of interrupted current.

The circuits are now completed for subscriber A to communicate to the operator at the central oflice the identity of the connection which he wishes and the operator answers subscriber A :by operating transmitter 248. The characteristic answer will be recorded on the printer represented by the receiving magnet 249 and will be repeated by the relay 241 to actuate correspondingly the receiving selector magnet 268 of the translator mechanism.

The translator device, such as that shown in Figs. 4 to 6, inclusive, is represented schematically by the selector magnet 268 and the photoelectric cell 286. The photoelectric cell 286 is connected to the control grid of the first electron tube of an amplifier shown schematically and indicated generally by the reference numeral 281. The plate electrode of the last electron tube of the amplifier 281 is connected by conductor 288 to the tip 233 of plug 232. Thus, signals originating at the subscribers transmitter 212 or at the operators transmitter 248 are received not only by the operators receiving device 249 but also by the receiving mechanism 268 of the translator unit and are therein translated into facsimile signals which are impressed upon the conductor 288 and are transmitted through plug tip 233 and plug tip contact spring 204 of jack 206 to facsimile recorder 201 by way of telegraph line 203 and winding of relay 202, which is energized by the facsimile signals but has no direct effect since the motor circuit has previously been closed by contact sprin 211 of key 216.

When the subscriber A has informed the operator at the central office by means of permutation code signals, the identity of the station with which he desires to communicate, which information is recorded by the operator's permutation code printer as a typed message and by the subscribers facsimile recorder as a facsimile message,- the operator then makes the connection to the called subscriber. This is done by means of the cord plug 291. The tip 292 of plug 291 is connected to conductor 288 in the same manner as tip 233 of plug 232 so that facsimile signals will be available at that element of the plug. The outer ring 293 of plug 291 is connected by conductors 294 and 296 to the winding of repeater relay 254 and then through the armature 291 of repeater relay 252 to battery 298.

The inner ring 299 of plug 291 is connected by conductor 301 to one end of the winding of supervisory circuit relay 302. The other end of the windingof relay 302 is connected to grounded battery 303. The left-hand contact tongue 304 of relay 302 is connected to one end of one of the windings of a double wound relay 306 and the other end of the winding of the relay 306 is connected to grounded battery 301. The inner right-hand contact tongue 308 of relay 302 is connected to one of the terminals of lamp 309, the other terminal of which is connected to grounded battery 311. Contact tongue 308 of relay 302 is operable between a front contact which is connected to ground and a back contact which is connected to the front contact engageable by the left-hand contact tongue 312 of relay 306. The contact 310 of relay 302 is connected to conductor 301, whereby the circuit of conductor 301 may be extended not only to the winding of relay 302 to battery 303 but also through the jack. The outer rlght hand contact tongue 305 of relay 302 is'connected to conductor 296 and its back contact is connected to ground, these connections being comparable with those of contact tongue 250 and its back contact. Relay 302 corresponds in function to relay 262 and relay 306 corresponds in function to relay 213.

The contact tongue 3| 2 of relay 303 is connected to a source of interrupted current indicated diagrammatically at 3I3 so that when relay 306 is energized and contact tongue 308 of relay 302 is inengagement with its back contact as a result of relay 302 being de-energized, interrupted current will be applied to lamp 309 to cause the lamp to flash to indicate to the operator a predetermined operating condition.

The right-handcontact tongue 3I4 of relay 306 is connected'to the front contact of relay 3; and the front contact with which contact tongue 3I4' is engageable is connected to one end of the holding winding of relay 306, the other end of which is connected to grounded battery 301. The contact tongue 3I1 of relay 3"; is connected to a key 3! which may be operated manually to interrupt the holding circuit of relay 306. Relay 3I6 has one end of its winding connected to the sleeve 32I of plug 29I and the other end connected to battery 322. Relay 3I6 corresponds to relay 243. Its purpose is to prepare a holding circuit for relay 306.

The plug 29I serves as means for connecting a subscriber, such'as A'fto whatever station to which he may desire to tranmit a message. For example, he may desire to transmit a message to subscribers station B, which is identical with his own station. This is accomplished by inserting plug 29I into jack I206 at subscribers station B. Upon the insertion of plug 29I into jack I 206, plug tip 292 connects the output 288 of translator 210 to the tip spring I204 of jack I206 which is connected by conductor I203 through relay I202 to facsimile recorder 'I20I at station B. .As soon as impulses begin to be transmitted over telegraph line I203 relay I 202 becomes energized to close its contact I209, thus completing the circuit of operating motor I201 which is set in operation to drive facsimile recorder I20I. Sleeve 32I of plug 29I contacts withbushing 12 of jack I206, whereby relays 3l6 and I 22I are energized in series. sertion of plug 29I into jack I206 also results in the connection of relay 302 to the back contactof relay I2I8 through inner ring 299 of plug 29I and ring contact spring I238 of jack-1206 and the connection of permutation code'signaling conductor 296 and its. extension 294 through outer ring 293 of plug29l and ring contact spring I236 of jack I206 to the upper front contact of relay I22I.. Relays 3l6 and I22I, upon becoming energized, attract their several contact tongues. Contact tongue I2I9 of relay I22I becomes disconnected from battery I222 and engages its front contact, thereby becoming connected. to permutation code signaling conductor 294., The circuit of conductor 294 is thus exlower winding of differential relay, I2I8 is ener- I The in- I gized, the relay will attract its' contact tongue I223 to connect ground to the winding of relay I224. However, since battery has been disconnected from that relay by the lowermost contact tongue of relay I22I, the relay I224 will not become energized and lamp I229 will not become illuminated.

The energization of only one winding of relay I2I8 and attraction of its contact tongues results in the disconnection of ground from jack spring I238 and thus from the winding of relay 302 at the central oflice. Thus, the relay 302, whether or not it may have beenmomentarily energized as the plug 29I was inserted into jack I206,'remains deenergized during the time the connection is up. In all probability it will have become energized momentarily because relay I2I 8 is of the slow-tooperate variety and its circuit does not become closed until relay I22I has become energized which operation occurs substantially instantaneously upon the insertion of the plug into'the jack. Relay 302 also operates substantially instantane ously and attracts its contact tongue 304 to complete the energizing circuit for relay 306,'thereby establishing contact with the source 3I3 of intermittent current for lamp 309 and also preparing the circuit of theholding winding. of relay 306. Since relay 3I6 became energized in series with relay I22I, its contact tongue 3| 1'has been'attracted tocomplete the holding circuit for relay 306 and that relay remains energized.

Lamp 309-Wi11 be illuminated steadily during the transient interval that relay 302 remains en= ergized due to' the connection of the lamp to ground through contact tongue 308. When relay I2 I 8 opens the energizing circuit of relay 302 and also of the relay 306,'larnp'309 will be transferred to connection with the'sourc 3I3 of interrupted current and will flash as long as plug 29I remains in jacks I206 and subscribers station B is conditioned for message reception. The connection to the source 3| 3 'of'interrupted curre'ntis maintained by the holding winding of relay 306 after the operating winding of that relay becomes de-energized. 1 1

The apparatus is now conditioned for the transmissiono'f message material from subs'criber s station A to subscribers station B and the operator may actuate key 255 to remove the operators set from the communication circuit. The permutation code signals generated by the'transmitter 212 will be repeated by the rela 241 to actuate the selector'magnet268 'ofthe facsimile translator 210 'and'the facsimile signals generated in thephotoelectric cell 286 and amplified in the vacuum tube amplifier 281 will appear at the out-- put". circuit 288 of the amplifier and will be irnpressed upon plug tip 292, jack spring I204; and telegraph line' I203 to operate facsimile recorder I 20I at subscriber's station B. The facsimile signals, in reaching the recorder I20I, traverse the relay I202 and this relay is preferably slow to release in order that the contact I209 shall not 'be opened and closed corresponding to the facsimile s gnals to interrupt the circuit of motor I201.

When the subscriber at station A has'completed the transmission of his message, 11:15 only necessary for him to'' open key 2 I 6. This opens the circuit o'fthe upper winding of relay '2I8 which is the signaling circuit and includes'relay 241 and repeater relay 252,. all of which become de-energized. The contact tongues of relay 2I8 are, therefore, attracted due to the relays becoming unbalanced and although the attraction of contacttongue 223 has no immediate effect, since the circuit of relay :224 is interrupted at contact tongue 226 of :relay 22I, the attraction .of the other contact 2225 results in th rde-energization of relay 292 whereby lamp :219 is connected to the source of interrupted currentLZB'I and flashes until plug 232 is removed from jack 203.. The operator should also remove plug 29| from jack .1296, whereupon all of the relays in thesupervisory circuit'will become lie-energized.

However; if at anytime before :the subscriber .A releases key 2l6, "the subscriber at station J3 desires to transmit areplyhe will close his key .I 2| 6., thus completing the permutation code communication circuit from .his. station through the upper winding of relay I'2.|:8, which will become neutralized and will .release'its contact tongues I223 and 4225., completing the circuit of relay 302 to cause it :to attract its contact tongue 338 and switch lamp 30.9 from condition of intermittent illuminationtoconditionof steadyillumination. This will indicateto the operator at the central :stationthat plug .29l should not be removed from jack 1296 but that the connection to subs'cribers station 'B should be maintained to permit the subscriber to transmit a reply to subscribers station .A. .Itfis to benotedthat withthe-plugs 232 and 29I in service in the jacks asxhereinbeforeidentified,the closure of .keysl2l'3 and :l2l6 will result in the disconnection of the local ground from the-windings "of repeater relays 2 52 and 254, respectively, due to the energiza'tion of'the relays 262 and 302, respectively, and extension of the circuit to the respective subscribers. Since the subscriber's station B is identical with subscribers station A, the station .3 may initiate communication with -;station A in the same manner that station Ainitiates communication with station B, as previously described. In this case the operator at the central station will answer the call of :stationB by inserting plug 2.32 into jack 1.266 and by operating key 255 to place transmitter 248 and receiving magnet .249 in communication station Band will complete the call by inserting plug 29l into jack 206. Pro-' vision is .made within the contemplation of the invention for the initiation of communicationby station A orB with subscribers whose stations include permutation code. apparatus only, and such stations may initiate communication with the station A or B.

At the extreme right-hand of Fig. 7 is shown a jack 33! which is .included in the section of the central office previously described and which has its outer plug ring contact spring 332 connected by an oilice trunk 333 to the plug tip contact spring 334 ofathree-circuit jack 336. The inner plug ring contact spring 331 of jack'33l is con-. nected to ground and the bushing 338 of jack 33! .is connected to one end of :the winding .of 1a re'lay339, the :other end of which is connected to ground.

.The contact tongue 34! which is operated by relay 339 is engageable with a front contact which is connected to ground and :is connected .by conductor 342'to .a lamp 343 associated with jack .336 in the section-cf the central ofiice which handles the switching of permutation code telegraph messages only and is shown in' Fig. 8. The plug tip contact spring 3440f jack 331 is left unconnected because there is no occasion to transmit facsimile signals into the section of the central office which handles permutation code messages only.

Upon the insertion of plug 291 into jack 331 the permutation code signaling conductor '294 is extended through jack spring 3'32-and 'o'flice assume trunk .333 to spring 334 of jack 336.. The circuit of relay 302 .is extended through lack spring 331 to ground to cause relays 1.3.9.2 and 386 to become energized, the former to disconnect the local ground from permutation code signaling conductor 294 and the latter-to prepare its own holding circuit and also the circuit for supplying :interrupted current to lamp .309. .As a result of the engagement of plug sleeve .32'] with jack Ibushing 33.8 the relay 3.39 is energized in series with the relay 3116, the former to complete the circuit for lamp 343 associatedwith jack 13.36 in the per mutation code message switching section .of the centralcffice and the latter :to complete the :holding circuit for the relay 30.6..

When the lamp 3'43 becomes illuminated the operator in charge :of the section of the central office, shown.in.fFig. .8, inserts plug 35] .into flack 336 preparatory to answering the call indicated by lamp 34.3 :for the purpose of completing the communication channel. Plug .351 is .a- 611189- circuit plug having tip 352, ring 353., :and sleeve ground andsleeve 341 is connected to one end of the winding of 'a lamp controlling relay .356, the other end of which is connected to ground The contact tongue 35! associated with rrelay .356'iis engageable with a grounded front contact and is connected by conductor 35.8 tonne-10f the terminals of a lamp 359 associated with jack 3.3L The other terminal 'of the lampis connected to a grounded battery 3.31..

The tip .352 or plug 351 is connected through an operators set 36L which'may beidentical with the :operators set :in Fig. '7, which, as .previously described, consists .of transmitter 2581and receiving printer 2'49 controlled by key 255, to one of the relays 362 of a telegraph repeater 363 and through the relay 362 and the contact tongue 364 of relay 365 to ground. The "plug tip 3521s also connected :by conductor .36! (to the back contact of a relay 3.68. The left -hand contact tongue 3.69, which is engageable with the back contact, is connected to a grounded battery 311.

The winding of relay 368 has one end connected to battery 312 and the other end connected .to sleeve 354 of plu 35l in the same mannerthat the winding of relay i3l6 is connected to sleeve 321 of plug 23!. The purpose-of relay 368 is to disconnect from the operators set'36l and from the relay 362 of repeater 363 the local battery 31 l which hold; the operators receiving printer and repeater relay 362 .energizedwhen plug 35! is not in active service in a jack. The relay 368 -also prepares a locking circuit for a double wound relay, as will presently appear.

The ring 1353 of plug '35! is connected to one end of the-winding-of .a relay 313, the other end of which is connected to grounded battery .314. The contact tongue 316 is connected to one :terminal of a1lamp3'l8, the otherterminal of which is connected to .grounded battery .319. The front contact with which contact tongue 316 is engagethe lamp will be steadily illuminated. The front contact with which contact tongue 311 isengage able is also connected to plug ring 353 and receives ground connection when the plug is in serted into jack 316. Contact tongue 311 is con'- tongues identified by th reference numerals 383: and 384. Contact tongue 383 is connected to a front contact of relay 368 which i engageable by a contact tongue 386. The contact tongue 386 is connected through a normally closed key 38'! to ground.

The front contact with which contact tongue 383 of relay 38! is engageable is connected to one end of the holding winding of relay 38!, the other end of which is connected to battery 382. The contact tongue 384 of relay 38! is connected come de-energized upon withdrawal of the plug from the jack. The holding'circuit of relay 38! may be interrupted by'the opening of the manually operable 'key 381 but this will have no effect upon the relay 38! and it wil1 remain energized through its operating Winding, since when the relay 368 is energized so that the holding circuit of relay 38! is completed through the contact tongue 386, the relays 313 and 38! are also energized, the latter through its operating winding. Also, it is not possible for the source of interrupted current 388 to be connected'to lamp 318 when plug 35! is inserted into jack 336. The circuit conditions necessary for lamp 318 to be operated from source of interrupted current 388 are that relay 38! be energized through its holding circuit and relay 313 bedsenergized to permit its contact tongue 316 to engage the back contact; When plug 35! is used in establishing connection between two subscriber stations having permutation code apparatus only, the relays 368, 313, and 38! and the lamp 318 are operable diifercntly, as will be described later.

The permutation code communication circuit and the opposite side of repeater 363 from that to which operators set 36! is connected extends from ground through the contact'tongue 39! ofrelay 362 and through the winding of relay 366 to the tip 392 of a plug 393. Associated with the plug 393 is a supervisory system that is identical with the supervisory system associated with the plug 35!. It includes a relay 394 connected to the ring 396 of plug 394 and arranged like the relay 313 to control the continuous or intermittent illumination of a lamp 391 and the energization of a double wound relay 398. The relay 398 is energizable in parallel with the relay 394 and like the relay 38! is arranged to prepare a circuit from source of intermittent current 399 tolamp 391. The relay 398 also completes its is energized in parallel grounded battery 4".

own 'holding'circuit'which is prepared by a relay 40!, the circuit of whichextends from the sleeve of plug 393. The relay 40! also has a contact tongue which normally engages a back contactto connect battery to plug tip 392 and thus to the winding of repeater relay 366 to hold the repeater relay energized when plug 393 is not in use.

Plug 393 is adapted to cooperate with the subscribers jack 4!! by which connectionmay be made toa subscribers station, such as thesta tion C. Between the subscribers jack. and the subscribers station C, certain supervisory circuits are needed which wil1 now' be described.

Plug tip contact spring 4I2 of the jack 4!! is connected to the front contact of a relay 3 which corresponds to the relay 22! of Fig. 7. Therelay 4! 3 has one end ofits winding con-' nected to ground and the other end of the winding connected to the jack bushing 4!4 so that when plug 393 is inserted into'jack 4!!, relay- 4'!3 becomes energized in series with relay 40! Contact tongue 4|6' of relay 4!3 normally engases the back contact which is connected to Contact tongue MS of relay 4! 3 is connected to one terminal of one of the windings of the differential relay M8, the other terminal of which is connected to conduc tor 4!9 which is one of a pair of conductors forming a metallic circuit for communication between subscribers station C and the central office. At the station C the conductor M9 is connected to one of the stationary contacts 42! of a key 422 which is open when station C is idle.

The other winding of difierential relay 4!8 has one end connected to grounded battery 423. The other end of the second winding of differential relay M8 is connected to a front contact of relay 4!3 with which contact tongue 424 cooperates. Contact tongue 424 is connected to a conductor '426 which is the other one of the pair forming the communication circuit between subscribers station C and the central oflice. 'At the subscribers end of conductor 426 the conductor is connected to one end of the winding of the receiving selector magnet 421 of a receiving print er. The other end of thewinding of magnet'421 is connected through transmitter 428 to a movable ccntact member 429 of key 422. When sub: scribers station C is idle, movable contact 429 of key 422 engages a fixed contact 43! which is connected to ground.

The back contact with which contact tongue 424 of relay 4 3 cooperates is connected to ground so that when relay 4! 3 is deenergized and key 422 is open, the conductive path comprising con tact tongue 424, line conductor 426, receiving selector magnet 421, transmitter 428, and movable contact 429 of key 422 is grounded at both ends.

Relay M3 is also provided with a contact tongue 432 which cooperates with a back contact only. The back contact. is connected to grounded battery 433. Contact tongu 432' is connected to one end of the winding ofrelay 434, the other end of which is connected to jack spring 436 of jack 4! and is also connected to a single front contact associated with'difierential relay. M8; Th single'contact tongue 435 controlled by difierential relay M8 is connected to ground.

Relay 434 has a single contact tongue 431 and front contact which is engaged by the contact tongue. Contact ton'gue'431 is connected to grOund. The front contact with which contact tongue 431 cooperates is connected to one terminal of a lamp 438', the other terminalof which is connected to grounded battery 439.

The operation of the subscribers stations: A and B and of the central office equipment has been described up to the point where repeater 363 and operators set 361 have been placed in condition to receive permutation code signals from the operator's set comprising transmitter 248 in FigT7 or from the subscribers transmitter stations A'or B, this being accomplished by insertion of plug-351 into jack'336. Upon communication to the operators -set-36 1' of the identity of the permutation code station with which station A. or B desires to communicate and, it being assumed that such station is the sub.- scribers station C, the operator inserts plug 393 intojack 411. Plug tip 992 engages jack spring 412 and extends the communication circuit to. the front contact with which contact tongue 419 of relay 41'3 cooperates. Plug sleeve 402' engages jack bushing 414 and places relay 413 in series with relay 491, whereupon both relays become energized. Relay 401 removes local battery from plug tip 392 and prepares locking circuit for double wound relay 398. Relay 413 moves its contact tongue 416 into engagement with its fixed-contact, thus extending the communication circuit through one of the windings of differential relay 419 and through conductor 419 to the open key 429. The relay 413 also attracts its contact tongues .424 and 432. The contact tongue 424 completes a circuit from ground through battery 423, the upper winding of difierential relay 418, front contact and contact tongue 424, line conductor 426, receiving selector. magnet 421, and transmitter 428 at the subscriber's station C to ground through the key 4222 Thus, a circuit is completed through the upper winding of relay 4'18 and through the selector magnet 421 at subscribers station C.

Since the relay 418 is a differential relay, and only one of its windings is now energized, the contact tongue 435 will be attracted to connect ground to one end of the Winding of relay 434 and also to the plug sleeve contact spring 436 of jack 4| 1. Since the circuit from battery 433 to the other end of the winding of relay 434 is open atthis time due to the fact that contact tongue 432 of relay 413 is attracted out of engagement with its back contact, relay 434 will not become energized and the lamp 438 will not become illuminated.

With the connection of ground to jack spring 436 through the contact tongue 435, the circuit of relay'3'94 is completed and relay 394 attracts its contact tongues, thus completing the energizing circuit for the double wound relay 398 which becomes energized and completes its holding circuit. 'The relay 394 also connects lamp 381 to ground so that the lamp becomes continuously illuminated.

The subscribers station C is provided with a rin'ger'441 connected across the normally open key 422 and having in series therewith a condenser 442 so that the ringer will be responsive to alternating current only. Well-known means may be provided'at the central oflice for applying alternating current between the line conductors 419 and 426 for operating ringer 441 to attract the attention of the subscriber at station C so that he may place his printing telegraph apparatus .in operating condition to receive a message. The subscriber does this by closing the key 422. Movable contact 429 is thus disengaged from grounded fixed contact 431 and is engaged with contact 421. Also, a movable contact 443 completes the circuit of motor 444 which is set in operation to drive the receiving printer represented by the selector magnet 42? and the transmitter mechanism 428.

As the result of closure of the key 429, a communication circuit is completed from battery 423 through the upper winding of relay 413, contact tongue 424, line conductor 426, receiving selector magnet 42], transmitter 428', movable contact 429 and fixed contact 421' of key 422, line conductor 419, lower winding of relay 4'18, contact tongue 416, spring 412 of jack 411, tip 392 of plug 393, winding of relay 36B of repeater 363, and contact tongue 391 of relay 362 to ground. It will be observed that the communication circuit includes both windings of the relay 418. Since this is a differential relay, it will release its contact tongue 435 and the tongue will remain released as long as key 422 is closed and plug 393 is in the jack 411, regardless of changes in the line from marking to spacing or spacing to marking condition.

The release of contact tongue 435 results in the removal of ground connection from relay 434 and relays 3'94 and 398, the latter remaining energized due to its holding winding. The release of the contact tongues of relay 394 will result in connection of the source of interrupted current 399 to lamp 391 through the attracted contact tongue of relay 398 and the released right-hand contact tongue of relay 394. This will indicate to the operator at the permutation code switching portion of the central oflice, shown in Fig. 8, that station C is in condition to receive a message. The operator thereupon notifies the subscriber at station A by operation of the operators receiving and transmitting set 361 that he may proceed with the transmission of the message. The message will traverse the repeater in Fig. 7 and the repeater 363 in Fig. 8 in reaching the subscribers station C and will be transmitted back to subscriber's station A for home record purposes as a facsimile message, conversion taking place in the translator 2'10.

When the subscriber at station A has completed the transmission of the message, he opens his key 216 and as previously described, lamp 229 becomes illuminated due to removal of energizing current from one of the windings of difierential relay 218. Thereupon, the operator at the combined permutation and code facsimile switching portion of the central ofiice withdraws the plugs 232 and 291. The withdrawal of plug 291 results. in deenergization of relay 339 and extinguishment of lamp 343' associated with jack 336. Thereupon, the operator at the permutation code switching portion of the central ofiice, which is that shown in Fig. 8, withdraws the plugs 351 and 393 from the jacks 336 and 411, respectively. The circuit of the relays 358 and 491 are thus interrupted and these relays release the holding circuits of the double wound relays 381 and 398, respectively. Also the'circuit of relay 373 is interrupted due to the withdrawal of plug 351. The circuits of ps 391 and 318 are thus interrupted and the lamps are extinguished.

The withdrawal of plug 393 from jack 411 opens the circuit of relay 413 which releases its contact tongues 416, 424, and 432. The contact tongue 416 upon release moves into connection with the battery 41! and the contact tongue 424 moves out of connection with the upper winding of differential relay 418, and into connection of the relay 434. The other end of the winding of relay 434 will beconnected to battery 433 due to the release of the contact tongue 432 by relay 4I3. Thus, the relay.434 will become energized and will connect ground to its contact tongue 431 to the lamp 438, thus completing the circuit of the lamp which will become illuminated. This will indicate to the operator at the portion of the central oflice, shown in Fig. 8, that the subscriber at station C has not yet opened his key 422. If the lamp 438 does not become extinguished within a reasonable time, the operator may reinsert plug 393 into jack 4 and inquire as to whether the subscriber at station C desires to transmit a message. However, should the subscriber at station C open the key 422 promptly such as to enable him to transmit a question'or comment concerning the message, or a relay to a question contained therein. Also, he may desire to interrupt the message in order to transmit a message to another station which will necessitate the changing of connections at the central office to connect station C with the desired other station which may, for example, be the station D.

The interruption ofmessage reception at station C may be accomplished by momentary opening'of key 422. Fixed contact 42I and the lower winding of differential relay M8 is thus disconnected from movable contact 429 and. the

grounded .fixed contact :43I is contacted by the movable contact 429, thus. causing the upper winding only of the relay M8 to be. energized and'to attract contact, tongue 435.. .Ground is thus connected through ijack spring .436 and plug ririg .398to relay 394.which, becomes energized andattracts its right-hand contact. tongue out of engagement with the contact to which the source of interrupted current 399 is connected and into engagement with a grounded contact,

' thus changing lamp 391 from intermittent illumiv nation-to momentary steady illumination. This indicates tothe operator at the central office that key 422 has been opened whereupon the operator actuates set '36I. tomake inquiry of the subscriber at station Gas to thereasonforhis interruption of the transmission or the identity of the station with which hedesires to communicate. J I

For purposes ofv illustration, it is convenient to assume that the subscriber at station Cdesires 'to communicate with station D. The operator 'at the central office completes the connection by removing plug 35I from jack 336 andinserting it into jack I4II. This caus es relays feet, 313,

and 38I at. the central ofiice to be energized in the same manner that relays 394, 398, and-4M were energized when plug-393 was inserted into jack 4| I, and causes relays I413 and the-upper winding of relay I M8 to be energized. The op-' erator then applies ringing current between the line conductors I4I9 and I426 to operate ringer I4-4I for the purpose of notifying the subscriber atstation. D to close his key I422. Upon the closure of the key I422 relay I4I8 releases its contact tongue. I435 due to the placing of its two windings in series and relay 313 is released to cause'its contacttongue 316 to move into its 'engagement with its back contact, wherebylamp 318 is connected to the source of, interrupted current 388 and will flash, for the duration of the transmission between stations C and D. From this it will be observed that'thesource of interrupted current 388 which does not become effective' at any time during communication between one of the combined stations, such as A or B, with one of the permutation code stations C or D, does become effective during communication between two permutation code stations; such as the stations C and D. if

' It is also possible for a permutation code station, such as the station D, to initiate communication with one of the combined stations, such. as the station B. The subscriber at station D closes the key I422 which completes the circuit of the motor I444 and also completes a circuit from the battery I4I1 through 'the lower contact tongue of relay I4I3, through the lower winding of relay I4I8, conductor I4I9, key I422, transmitter I428, receiving selector magnet I421, line conductor I426, and innermost upper contact tongue of relay I4I3 to ground. Differential relay. I4I8 having only Zone of itswindings energized attracts its contact tonguel435 to complete the circuit of relay I434 whereby lamp I438 is illuminated. The lamp I438 serves as a signal to the operator to answer the station Dby inserting either the plug 35I or the plug 393 into jack MI I, the two plugs having identical supervisory circuits associated therewith. It, will be assumed that the operator answers with the plug 393. Relays 394, 398, and 40I are energized, as

is also relay I4I3, whereupon the lamp controlling relay I434 is released and ',relay 394. is released to cause lamp 391 to be illuminated intermittently. When the operator has ascertained from the subscriber at station D theidentity of V the station with which'he wishes to communicate. which will be assumed to be station B,jplug 35I is inserted into jack 336,thus causing the supervisory relays .316, 368, and 38Ito becomefenergized and also the relay 3 56.'w hereby lamp 359 is steadilyilluminated Q The lamp 359 serves as a signalto theflope'rator who has the receiver 249 to answer the, call availextended to? plug ,'.29 I The operator at the central ofifleeof F 'igi 'lguponbeing informed that the subscriber at station B is the calledsubs'criber, inserts plug 29 I into jack I f The supervisory circuits associated with the p lug- 29-I. respond to the insertion of the plug into j ack I2Il8 and the were r t aswiiaeajnm neri p spend in the same manner aspreviouslydescribed for transmission-or" a message from station A to station B; The permutation" code signals repeat: ed by'the repeater in'Fig; 1- from the signal trans* mitted from station D" will terminate at the ground engaged by contact tongue 3I9' of relay 302, due to thefact that'relay 302 does not r remain energized because the contacttongue' I225 of differential relay" I2 I8 atstation B' will be out of engagement with itsback" contact as a result of the energization' of the lower winding only of relay I2I'8. Should the subscriber at" station B close his keyI2I6, which he has no occasion to do" unless" he desires'to break in on' the message being transmitted to him, the relay I2'I8j will release its contact tongue and ground connection will be extended to the relay302 to cause it to be e energized, thus attractingits' contact tongue 3I'9 and disconnecting ground from the permutation code signaling circuit at that point, the terminal of the circuit then being the ground at the transmitter; I2I2' of subscribers station E. Since there is'no apparatus at the station B re'spons'ive to permutation c'o'de' signals; those sig'nal's will have no effect at that point. Facsimile signals for actuatingv the facsimilerecorder' IZIII will be generated in the photoelectric" cell 286 of' the translator and will be" impressed upon the conduct'or288 and the plugitip 292fr'om which point they will traverse the jack spring I204, telegra h line' I203; and relay I202 terminatm at the facsimile" recorder" I2'IJI; The energization of relay I202 will cause thermotor circuit to close and remain closed, thus: causingthe motor r201 to be ac'tuated for driving the facsimile recorder IZQI.

When thesubscriber at station D con'cliid'e's the transmission of thelir'iessag'e, he opens the key M22. This opensthe circuit or one: of the wind ings of the relay I IIB which thus becomes unfbalanced and attracts its contact tongue I435, corinecting'ground' throiigh jack- I41 I to the winding of relay 39'4'whichbecomes energized and attracts its rightfhand contact spring into engagement with the" groundedneht contact, thus causing lamp 391 to he illuminated steadily. Thereu o'n; the operator withdraws plug sesnem seek an and withdraws p ug" 35I from jack 335. All or the su'p'eMisery relays ass ciated with jack I4 II', with plug 393L'With piugss'lgend Withijack 336' becomejdei-energized; whereupon. lamp 359 will be extinguished. This" is the signal to the operator a it 'e't porn-error the eentrar office, shown Fig. 7;te' withdraw ping 232: from jack sat and tewithcraw' phi-emf from ja'cli 1211s.

"Upon the wit drawal of the pines, an of' the' supervisory circuits; namely, those" associated the'fixed stationsEF, and G." Keyboard transjmitter 56I- may bejof verysimple form, such; as the one disclosed' -in" United" StatesPatent 1,135 613, granted-April I3; l915';'t0'L M. Potts,

having notransmittingdistributor, but having merely transmitting contacts to'be closed" sub-' stantially' simultaneously in' permutation'alcode combinations under controlofa keyboard mechac nism. The keyboard is providedwitlr a l'ocl'; lever The transmitting contactsare connectedto' con ductors contained in a cable 5G4: The cable terminates in a central offi ceH wherethetransmitting contact'condil'ctorsof all of the cables 56' areconnected to bus" bars or other common conductors' 565. v

The common conductorsS'BS'areconnected to the individual selector magnets 561 of a transl'a tor mechanism which may besimilar to or identicaf with that shown in Figs. 1 to 3'} the'ma'g-nets 561' corresponding to the magnets 61 of Figs. 1 to 3. Thearmatures 568 ofthe magnets 561 are arranged to operate the slides 569 whichcontrol the shutter slides 51 I and'al'soefiect tripping of a clutch, such as that shown in'Fig-s; I and 3, to impart rotation to the scanning drum. Through the-rotation of the scanning signals are generated inphotoelectric'cel-l 512-, which signals are amplified by amplifier 513 andaretransmitted by radio transmitter 514.-

' The facsimile translator shown in Fig, 9' is provided' with-a pair of norm-ally open contacts 516 that are closable by a cam operated lever 511. Lever 511 maybe operated b'y 'ac'am (not shown) driven along: with the scanning cylinder and arranged to close'the' contacts atthe beginning of rotation and to permit them to open near the end of the cycle; One of the contacts is connected to battery and the "other isco'n'nected to a seventhconductor contained each of the cables 564. At the stations E, F, and G,. the seventh conductors are individually connected to the'keyboard loclrcontrolling magnet 563;

Each of the" stations E, F, and: G is provided with a radio receiver 518 for receivingfacsimil'e telegraph signals transmitted by the transmitter 514-, and the output of the radio receiver is connected to the signal responsive magnet 519 of a facsimile printer 581' for recording facsimile messages received bythe radio receiver 518; There may also be stations, such asthe'station J, from which there is no occasion to transmit messages,

for example, be a police motor'vehicle equipped only for one-way communication, as is a common' custom; namely for the reception of in- "formation or instructions.

Inthe systemshown in Fig; 9, message transmission from any of the stations E,.F, or G may 'be effected by depressing the keys to control the 'This'will' result, as disclosed in Figs; 1- to-3, in the generation of facsimile signals-at thephotoelectriccell whichwillbeamplifiedtat 513 and broadkeyboard when a key lever has been depressed;

cast by transmitter 514'. At the beginning of the generation or the facsimile signalcontacts 516 are closed; thus' completing the circuits of magnets 563' at' all -of" the stationsE F; and G, whereby the magnets become: energized and the locks 582-are operated-to lock all of the keyboards.

I As' the facsimile signal corresponding to the permutation: code is transmitted by. radio transr'nitter 514; it isreceived by the. radio receivers 518 at stations E, F, G, and J and is vrecorded on the facsimile' printers 58L Toward the end of the'facsimile signal contacts 516' are opened and the magnets 563 are released, whereby locks "562 are disabled and a'key may be depressed at any of the keyboards. By providing forthe locking of allotthe keyboards, one keyboard-may notbeoperated to interfere with the registering,

the selector magnet 6l2.

"upon magnets 56?, of a code combination initiated at another keyboard.

Another communication system employing apparatus according to the present invention is connected to ground and to a communication conductor 603. a facsimile recorder 604 which may be similar to The keyboard transmitter 60!, and

the facsimile recorders 20! and IZUI, shown in Fig. '7, make up a subscribers station, such as the station K. The facsimile recorder 604 is connected to one end of a communication conductor 601.

Other subscribers stations L and M are similarly provided with keyboard transmitters 60! and facsimile recorders 604.

Each of the conductors 603 is connected to one terminal of an individual line relay 608 at a central ofi'lce station N and the other terminal of the Winding of each relay 608 is connected to battery 669. A series circuit beginning at ground at the central ofiice station N includes the line relay contacts 6!! of the line relays 608, and the selector magnet N2 of a signal translator 6I3 which may be similar to that shown in Figs. 4 to 6, inclusive, the series circuit then extending from the selector magnet 612 to battery 609. The photoelectric cell 6M corresponds to the cell 32 in Fig. 4 and generates facsimile signals corresponding to permutation code signals impressed upon The facsimile signals generated in the cell 6M are amplified in amplifier filfi and are applied to the communication conductors 60'! over which they are transmitted to the facsimile recorders 684 at the stations KL,

and M.

Upon the operation of any one of the keyboard transmitters at stations K, L, and M, its transmitting contacts 692 are operated in accordance with permutation code combinations, and the record and also to all of the other stations connected to central office station N. Thus, any one 'of the stations K, L, and M may communicate with each of the other stations in the'system. As distinguished from the communication system shown in Fig. 9, the system shown in Fig. 10 involves metallic conductors throughout for inter- "connecting the several stations and is particularly applicable to industrial installations, hotels, and other business organizations where it is desirable to provide intercommunication between several locations with the recording of all transmitted material at all stations. a

Although certain specific embodiments of the invention have'been shown and described herein, itis to be understood that the invention is not limited to such specific embodiments but is capable of modification and rearrangement without departing from the spirit of the invention and within the scope of the appended claims.

, What is claimed is:

1. In a telepgraph system, a station having a permutation code signal transmitter and a facsimile signal receiving printer, a second station having a permutation code signal transmitter and a permutation code signal receiving printer, signal circuits connecting said stations, and a translating device at said second station for translating permutation code signals originating at either of said stations into facsimile signals and for transmitting over a circuit said facsimile signals to the first mentioned station.

2. In a telegraph system, a plurality of similar stations, a permutation code signal transmitter and a facsimile signal receiving printer at each of said stations, a central station, signal conductors extending between said stations and said central station, means for interconnecting the first mentioned stations through said central station with said conductors, and a translating device at said central station for translating permutation code signals received from one of said first mentioned sations over its signaling conductor into facsimile signals and for transmitting said facsimile signals over another signaling conductor to another of said first mentioned stations;

3. In a telegraph system, a station having a codesignal transmitter and a character pattern signal receiving printer, asecond station having a code signal transmitter and a code signal re- .ceivingI-printer, a signaling circuit connecting said stations, and a translating device at said second station for translating code signals originating at either of said transmitters into character pattern signals and for transmitting over said signaling circuit said character pattern signals to the first mentioned station.

.4. In a telegraph system,.a.station having a first mentioned code, a signaling circuit connectingsaid stations, and a translating device at said second station for translating signals originating at either of said transmitters into signals accord- -ing to said different code and for transmitting over ,said signaling circuit said signals to the E first mentioned station.

5. In a telegraph system, a plurality of stations, apermutation code signal keyboard transmitter at certain of said stations and a facsimile signal receiving printer at all of said stations, a

central station, signaling conductors connecting said-stations, means for interconnecting the signaling conductors of the first mentioned stations through said central station, and a translating Idevice atsaid central station for translating per- ;mutation code signals received from the first mentioned stations equipped with a permutation code signal keyboard transmitter into facsimile plurality of statransmitter and a facsimile signal recorder; a plurality of stations each having a permutation code signal transmitter and a permutation code signal receiving printer, a central office system,

line. conductors connecting said stations with said central ofiice, means in said central oifice system ;;for:r interconnecting Jthrough said conductors Early. one of said stations :withany other one of

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