US2270339A

US2270339A - Extension circuit system

Info

Publication number: US2270339A
Application number: US226729A
Authority: US
Inventors: Louis M Potts
Original assignee: Teletype Corp
Current assignee: AT&T Teletype Corp
Priority date: 1938-08-25
Filing date: 1938-08-25
Publication date: 1942-01-20
Anticipated expiration: 1959-01-20

Description

Filed Aug. 25, 1938 5 Sheets-Sheet 1 IIIlIIIIIIIIIIIIIII LOUIS M. POTTS ATTORNEY.

Jan. 20, 1942. L. M. Pom

EXTENS ION G IRGUIT SYSTEM Filed Aug. 25, 1938 5 Sheets-Sheet 2 INVENTOR. LOUIS M. POTTS A ORNEY.

Jan. 20, 1942. M. PoTTs 2,270,339

EXTENSION CIRCUIT SYSTEM Filed Aug. 25, 1938 5 Sheets-Sheet 5 24| FIG. 8

v I; F |G.'9

INVENTOR.

LOUIS M. POTTS Y ATTORNEY.

Jan. 20, 1942. o s 2,270,339

EXTENS ION CIRCUIT SYSTEM FiledAug. 25, 1958 5 She ts-Sheet 4 ATTORNEY.

v Jan. 20, 1942.

L. M. POTTS EXTENS ION CIRCUIT SYSTEM Filed Aug. 25, 1938 FIG. H

a 239 220 209 my 331 341 4 302 "224 I) D D D) D) I) I) r) 325 327 i I I 324 m 304 ggg 4 IiiDJDIDDTIDDIII f ('6) 5 Sheets-Sheet 5 INVENTOR. LOUIS M. POTTS ATTORNEY.

Patented Jan. 2( 1942 2,210,339 axrsusron cmcurr SYSTEM Louis M; Potts, Evanston, 11L, assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application August 25, 19:8, Serial No. 226,729

sa'oial m. cl ire-52) .and it is a still further object of'this invention Thisinvention pertains to synchronous multiplex telegraph systems in which a channel of the system is equipp d at its ends with signal receiving and translating devices connecting the channel operatively over further or extension line channels to remote substations. Specifically, the invention pertains to such systems in which the extension line channels may be single wire channels operated upon the two-way simplex system of start-stop telegraphy.

The object of the invention is to provide a simple and inexpensive mechanical means for translation of signals and for retransmission of translated signals from a first simplex line into a multiplex system arid'from the multiplex system into a second simplexline.

To effect the above result, mechanical devices are required in two classes, first an extensor having the functions of receiving start-stop permutation code signals from a substation at irregular intervals or at the maximum speed of which the substation is capable of storing the sgnals and of supplying the stored signals to a multiplex distributor commutator in such manner that the multiplex distributor may retransmit the stored code signals into a multiplex channel, and second, an extensor having the functions of receiving permutation code signals from said multiplex channel and retransmitting them in the form of start-stop code signals into an extension line channel. G

Since each extension circuit of two-way simplex transmission nature must be connected to the first extensor for receiving code signals from the substation and to the second extensor for transmitting code signals to the substation, it is a further object of this invention to provide echo suppression signals preventing signals generated by the second extensor from regenerating any signal in the associated extensor.

It is a feature of this invention to provide a system of apparatus for transmitting a break signal through a multiplex channel by creating upon one simplex line a break signal of extended length and of spacing nature, translating the said break signal into a repeated permutation code signal, transmitting the repeated permutato embody the said break signal translating means mechanically in the structure of the re- I spective extensors and to provide therein contacts for controlling signal lamps which will indicate a break signal or an accidental break in a line circuit,cidentifylng at the same time th extension clrcuit in which the break has occurred. The recited objects and features of invention are attained by adding to a multiplex system, according to the present practice, only the required number of first and second 'extensor ma-' chines, with no modification of substation equip-' ment upon the simplex lines and with a minimum modification of the distributing commutators within the multiplex system.

As illustrated in detail herein, a system of apparatus according to this invention comprises a multiplex line of a plurality of channels having customary terminal apparatus of transmitting multiplex distributor and receiving multiplex distributor with whichis combined, for each or for any channel, a pair of mechanical translating devices. One of the translating devices has functions of receiving start-stop permutation code signals from a simplex line, storing the group of permutation elements of each code signal, and delivering the stored group of permutation elements to the transmitting multiplex distributor in proper timing to effect transmission of the permutation group over a multiplex channel. The other of the pair of translating devices has functions of receiving th transmitted group of permutation elements from the multiplex channel and immediately retransmit ting the permutation group with added start and stop signals to form a complete start-stop permutation code signal'upon a further simplex line.

' remains stored until the transmitting multiplex distributor reaches a signaling position, when a local signal from the transmitting distributor causes transfer of the stored combination to be tion code signal through the multiplex channel,

impressed upon commutator segments for immediate transmission over the multiplex channel.

. Three cam sleeves are provided on one motor driven shaft in this translating device, the first cam sleeve being responsive to a starting signal received from the start-stop simplex line and the second cam sleeve being started at conclusion of the received code signal to qualify for operation -bination of impulses in the simplex line.

the retransmitting cam sleeve which is started in response to a starting signal from the transmitting distributor and which immediately transfers the stored code signal to segments of the multiplex distributor for transmission.

In the second mentioned translating device, a set of magnets and latches operate in response to received im ulses to register a received code signal after which a local impulse from th receiving distributor to the translating device causes the registration to be transferred to a cam type start-stop distributor which immediately transmits a full start-stop code signal embodying the stored code signal to an extension simplex line.

Apparatus for transmitting the break signal as above described is embodied in part in the first mentioned translating device in the form of a means responsive to presence or absence of the stop impulse which normally follows a code com- Upon opening a substation break key in the simplex line, the signal transmitted and received by the first mentioned translating device is equivalent to blank code signal repeated without any stop impulse. Absence of stop impulses causes the translating device to retransmit figures shift code signal repeatedly into the multiplex chanhel.

Further apparatus for transmitting the break signal is added to the second mentioned translating device in the form of a ratchet and driving pawl. figures shift code signal to drive the ratchet. step by step and after three or more steps, the

ratchet operates a switch to open the extension simplex line, thus reproducing in the receiving extension circuit the breaking condition set up by the break key in the originating extension circuit.

A better understanding of the invention may be attained from the following description, taken in conjunction with the accompanying draw ings, wherein i Fig. 1 illustrates a general circuit arrangement embodying the invention;

Fig. 2 illustrates, in a theoretical mechanical diagram, details of structure of an A extensor taken as of a vertical section through an axial plane of the power shaft of the extensor;

Fig. 3 illustrates the structure of an A extensor in theoretical mechanical diagram taken as at right angles to the diagram of Fig. 2;

Fig. 4 shows a further detail of the structure of Figs. 2 and 3;

Fig. 5 shows detail of starting mechanism for starting the A extensor mechanism under control of a received starting signal impulse;

Fig. 6 shows another view of the mechanism of Fig. 5;

Fig. 7 shows, in theoretical mechanical diagram, details of. structure of a B extensor machine taken as an elevational view sectioned across the axis of the power shaft;

Fig. 8 shows further detail of the structure of Fig. 7 taken as an elevation at right angles to the view of Fig. 7;

Fig. 9 shows a detail of the view of'Fig. '7;

The pawl responds to a received Fig. 10 ShOWs details of the mechanical struc- Fig. 13 shows a detail oi the structure of Fig. 10; and 1 Fig. 14 shows a detail of the structure of Fig. 7.

Referring to Fig. 1, rectangles II and i2 represent A extensors, rectangles l3 and ll represent B extensors, rectangles l5 and I6 represent substations, the substation i5 being connected to A extensor i i by line conductor l'l, the A extensor ii being connected by cable 18 and local signal conductor l9 to a transmitting multiplex distributor it which is connected over a line conductor ii to a receiving multiplex distributor 22, which is connected by cable 23 and local signal conductor 26 to B extensor machine M, which is connected further by conductor 25 through windings 26 of magnets 21 and thence over line conductor 28 through substation it to ground connection. The elements here recited from IE, IT to 28, and it have been mentioned in the order of transmission of communication from substation it to substation it. A further conductor 29 connects B extensor it to'A extensor I2 and current over this conductor prevents the armature of magnet 21 in extensor i2 fromresponding to signals transmitted through winding 28 of that magnet. Identical apparatus and circuits are shown for transmission of communication signals irom substation is to substation it through A extensor 52, line conductor 3|, B extensor i3, and through a magnet winding 32 of magnet in A extension it with similar provision of conductor 30 for echo suppression.

Structure of an A extensor machine tail in Figs. 2 to 6, inclusive, and in exploded perspective in Fig. 10. It comprises a power shaft 35 which rotates continuously by power received through gear 36 and which bears fixed thereupon the continuously moving parts of three clutches which drive intermittently three start-stop cam sleeve members; namely, a permutation code signal receiving cam sleeve, or code cam sleeve 37, a blocking cam sleeve 38, and a retransmission function cam sleeve 40.

Code cam sleeve 31 is driven by friction clutch il, d2 under tension of spring 83 and is restrained in its stop position by stop arm 44 under control of code signal magnet 45, as illustrated in Figs. 5 and 6. Cam sleeve 31 bears five combinational cams t6 and an operating cam 41. Blocking cam sleeve 38 is driven by a friction clutch 50 whose power take-oil member 5i has a spline projection 52 passing through a radial slot at the apex of a cam 53 on cam sleeve 38. The cam sleeve 38 and the take-off member 5| are restrained in stop position by a latch 54 which engages the spline projection 52 and is arranged to release the friction clutch El under control of cam 31 through operation 01 a train of members including 90, 92, 93, 94, and 95, as described in detail below. Cam sleeve 38 bears blocking cam 55, sixth impulse cam 56, and first transfer cam 57, in addition to the mentioned cam 53.

Retransmission function cam sleeve 40 is driven by a toothed clutch 59 whose power member 60 is pinned to shaft 35 and whose sliding takeoff member BI is splined to cam sleeve 40, is urged by spring 62, and is restrained from engagement with power member 60 by detent 63 under joint control of magnet 64 and of cam 55 on cam sleeve 38.

Sliding clutch member 6! bears crown cam 68,

while cam sleeve 48 bears second transfer cam 65, deleting cam 66, and resetting cam 81.

I In Fig. 2, operating springs and retractile springs, other than clutch springs. are omitted to simplify the drawing. The three clutches and cam sleeves are related as follows: Reception is initiated by release of the armature of the code signal magnet which starts the code cam sleeve, and just before the endoi' its rotation the code cam sleeve starts 1 rotation of the blocking cam sleeve which, in its initial angle of rotation, withdraws a blocking latch and unlocks the armature of magnet 64 to respond to electromagnetic control.- Retransmission is initiated by receipt of a controlling impulse in magnet 84 from a multiplex distributor, to start rotation of the retransmission cam sleeve.

With code signal magnet 45 energized, its armature 12, Figs. 3, 5, and 18, and armature carrier '82 are held attracted in counterclockwise position upon pivot 48. Its striker 13, shown as an adjustable screw, is held in its marking position.

A rocking lever 14 engages and latches a rotary gate member 15, Figs. 5 and 10, which engages g5 and restrains the stop arm 44 of code cam sleeve 31. Upon de-energization of magnet 45 in response to a received starting impulse of spacing nature, retractile spring 16 rotates armature carrier 82 upon its pivot 48, causing striker 13 to 88 operate the sliding pin 11, which rocks a bell crank lever 18 clockwise upon its pivot 18, thereby rocking the lever 14 upon its pivot 88 against tension of compression spring 8i, Fig. 6, to unlatch the rotary gate member 15. Armature lever 82 is restored to its operated position shown by a cam lobe 88, Fig. 10, on cam sleeve 31 in engagement with a cam follower I88 on armature lever 82.

In rotation of cam sleeve 31, five code cams 46 do operate successively five code cam followers 83,

Figs. 3 and 10, about a common pivot 84 against tension of individual springs 85, thus drawing five code swords 86 momentarily against a marking anvil I36 or spacing anvil I31 carried by an armature sublever I38, accordingly as armature lever 82 may be at the instant in its counterclockwise position in response to a received marking signal impulse or in its clockwise position in response to a received spacing signal impulse. 68 Armature sublever I38 is operated by adjustable striker I48 on armature lever 82 against which it is drawn yieldably by spring I46. By engagement with marking or spacing anvil of armature sublever I38 to form a fulcrum, and by power received from code cam follower 83 through a socket articulation, the five code swords 88 are positioned in clockwise or counterclockwise position severally, and thereafter are pressed against one arm of five code T-levers 81 by individual springs 85, go rotating the'T-levers and shifting the five code slides 88. A sixth equipment comprising code sword, T-lever and code slide is described under Break signal structure later herein. A more complete description of the code signal respong5 sive'apparatus of Fig. 3 may be had from Patent No. 1,904,164 issued to S. Morton et a1.

Bell crank cam follower 88 pivoted at 8i, Figs. 2, 3, and 10, is positioned in the path of cam 41, Figs. 2 and 3, and operates momentarily just be- 78 fore cam sleeve 31 stops, to rock an arm 82 fixed to a rocking shaft 83, Figs. 2 and 10, to which is fixed an arm 84, which engages and rotates clockwise, a spring-urged trigger 85 pivoted at 86 I which, when rotated clockwise by arm 84, re- 75 leases the clutch latch member 54. Retractilo. spring 81 rotates the member 54 on its pivot 58. drawing the member 54 out of the path of spline 52. A cam follower roller 88 is mounted upon member 54 and is positioned in the path of cam 53, Fig. 2. Engagement of cam- 53 and its follower 88 rotates member 54 on its pivot to relatch the member 54 and trigger 85.

While the blocking cam sleeve 38 is in its position of rest, the apex of cam 55, Figs. 2, 4, and 10, holds cam follower MI in blocking position upon its pivot I82, and a connecting spring I88 also holds the rocking member I84 in blocking position upon the common pivot I82 and in' abutting engagement through mechanical contact I18 with follower I8I, thus maintaining a blocking latch member 58 upon member I84 in position to engage an armature lever 18 carrying armature II of magnet 64 to prevent more than a negligible movement of armature H. In any other angular position, apex 55 permits follower I8I and its associated members I84, 68 to rotate under tension of spring I86, which will position blocking latch 68 to clear the path of extension arm 18.

Sixth impulse cam 56 is positioned to operate its follower II8, Figs. 2 and 3, at an early instant in rotation of cam sleeve 38. Cam follower H8 is fixed to a rocking shaft III which carries also an operating arm II2 articulated by socket connection to sixth sword H3.

The apex of first transfer cam 51, Figs. 3 and 18. is positioned to restrain its follower II4 while cam sleeve 38 is at rest and to operate its follower H4 and jockey blade 88 into transfer locking position soon after operation of cam follower II8 when cam sleeve 38 has started. Follower II4 is pivoted at II5, Figs. 2 and 10, and has an operating arm II6, Figs. 2, 3, and 10, which carries a jockey blade 88 engaging locking projections of six storage slides 88. Operation of follower II4 by arrival of cam 51 at stopped position lifts the blade 88 from slides 88.

Armature lever 18 normally is held in its position shown in Figs. 4 and 10 by attraction of differential magnet 64 and is blocked against effective retractile operation by blocking latch 68. Armature lever 18 is fixed upon rocking shaft II'I upon which shaft the clutch detent 63 is rotatably carried. Detent 63 has an adjustable striker screw I I8 in engagement with armature lever 18, the two

members

63 and 18 being held in engagement by a spring II8. When armature H is in attracted position as shown, the distal end of detent 63 is in position to be engaged by crown cam 86 on sliding clutch member 6|. When armature II has been released by de-energization of magnet 68, retractlle spring I28 rotates the armature lever 1I and detent 63 to remove the end of detent 63 from crown cam 68, thereby releasing the sliding member 6| under tension of spring 62 to engage power member 68 to drive the cam sleeve 48.

The apex of cam 65 on cam sleeve 48 is positioned to operate its follower I2I soon after starting of rotation of transmission sleeve 48. Follower I2I is of yoke shape pivoted at I22 with an integral arm I23 which is connected through a link I24 to a pivoted arm I25 under tension of spring I26, Fig. 3, and rocking upon a fixed pivot I21. The distal end of arm I25 bears a stud I28 which constitutes a common pivot for six transfer members I38, each of which is connected through a ball and slot articulation to one of six individual bell crank levers I3I having operating arms I32 which control the position of electrical contact springs l33. All levers I 3| are pivoted upon a common fixed stud I34, and each is held in either of its two positions by an individual jockey I35.

The deleting cam 66 operates its follower I40 momentarily upon its pivot I4I near the end of rotation of cam sleeve 40. Pivoted upon the fixed pivot stud I34 is a yoke lever I42 bearing an integral bail blade I43 shaped to engage all of the six bell crank levers I3I. Members I40 and I42 are articulated by an extension finger I44 on member I40 riding against an extension I41 of member I42.

The apex of resetting cam 61 on cam sleeve 40 operates its follower I45 at any median point in its rotation and the apex passes the follower before stopping, thus leaving the follower free to fall at any instant during the period of-rest of the cam by reason of de-energization of magnet 64 and release by latch 66. Follower I45 is pinned to rocking shaft II1 to which armature lever 18 also is pinned, each operation of follower I45 thus returning lever 10 toward magnet 64, thereby drawing clutch detent 63 through spring I16 into position to be engaged by crown cam 58. By this movement of armature lever 18, the blocking end thereof is withdrawn from the path of blocking latch 66, permitting the latch 69 to move into blocking position.

Crown cam 68 on sliding member 6! of clutch 59 engages the end of detent 63 and the member 6| slides in response to that engagement, thus disengaging itself from power member 60, interrupting transfer of power from member 68 to member 6i.

Referring to A extensor II, Fig. 1, magnet 55 is held energized during periods of nontransmission by current through its windings 32, which are components of the extension line circuit including battery I51, resistor I52, retransmission contacts I53 of B extensor I3, closed contact I55, central station local conductor I55, windings 32 of code signal magnet 85 in A extensor II, extension circuit line conductor I1 to substation I5, break key I56, transmitter contacts I51, slowto-release break signal relay I58, recorder selector magnet I58, and ground. Differential magnet 64 is held energized during periods of nontransmission by current through its winding I60 which is included in a local circuit with battery I6I, resistor I62, and ground. An operating circuit for difierential magnet 64 includes battery I6I, resistor I62, winding I63 of magnet 64, local central station conductorlil, segment I64, and brushes I65 of multiplex distributor 20 and ground.

Retransmitter I10 in A extensor II, Fig. l, includes six electrical contact springs I33, Figs. 1, 3, and 10, adjustable into marking position by six transfer members I30, Figs. 2, 3, and 10, and into spacing position by bail blade I43. Five contact springs I33 numbered 1 to 5 and shown in spacing position in Figs. 1, 3, and 10, are controllable through five cam followers 83, and one contact spring I33 No. 6, shown in marking position, Fig. l, is controllable through cam 56, Fig. 2. Contact springs I33, Nos. 1 to 5, are connected through cable I8 to segments 1 to 5 of multiplex distributor 20. Marking transmission battery I12 is connected through resistor I13 to marking contacts I14, Nos. 1 to 5, and to spacing contact I15 of springs I 33, No. 6, in the transmitter I10. Spacing transmission battery I16 is connected through resistor I11 to spacing contact of spring I33, No. 3, and to marking contact of spring I33, No. 6, and when contact spring I33, No. 6, is in marking position, as shown, the spacing battery connection is extended through a local conductor I18 to spacing contacts of springs I33, Nos. 1, 2, 4, and 5.

The maximum speed of operation of the transmitter at substation I5 is less than the speed of operation of distributor 28 at the central station.

Operation of the A extensor machine Operation of the A extensor machine II, Fig. 1, illustrated in detail in Figs. 2 to 6 inclusive and Fig. 10, is as follows: Upon receipt over line conductor I1, Fig. l. of a starting spacing impulse of an incoming start-stop code signal, code signal magnet 45, Fig. 3, releases armature 12 which moves armature carrier 82 and striker 13, Figs. 3 and 5, to operate pin 11, Figs. 5 and 6, bell crank lever 18, and rocking lever 18 to unlatch gate 15 which releases stop arm 86 and permits a revolution of selector cam sleeve 51. The five cams Z6 cooperate with the armature 12, armature lever 82 and armature sub ever I36 of code signal magnet 45 to adjust the five swords 86 in code manner in response to the received permutation code signal. Cam 81 then operates the bell crank cam follower 36, and the cam sleeve 31 stops with the armature lever 82 in marking position.

Cam follower 95, rocked. momentarily by cam 81, operates through

elements

92, 83, 94 and 85 to unlatch the member 55 which is operated by its spring 91, Fig. 3, to release spline 52 of clutch 5i, thus starting the cam sleeve 38. The first operation by cam sleeve 38 is effected through its cam 55, Figs. 4 and 10, which moves its apex away from its follower I81 pivoted at I02, and through spring I63 and mechanical contact extension I19 permits spring I86 to rock the member I04 upon pivot I82, thereby rocking the blocking member 69 away from the end of armature lever 18 and clearing a path for operation of lever 10, so that armature 1! may be operated by spring I20 when released by magnet 64. This condition maintains until cam sleeve 38 completes its rotation. The second operation by cam sleeve 38 is effected through its cam 56, Figs. 2 and 3, which operates momentarily its cam follower H0, Fig. 3, upon rocking rod III which has fixed upon it an arm II2 with socket articulation to a No. 6 sword H3, which by reason of the marking position of the armature 12 of selector magnet 45 at this time by "stop signal! or resting time current, results in setting sword II 3 into marking position, as shown in Fig. 3. The third operation by the cam sleeve 38 is efiected through its cam 51 which releases its cam follower H4 and rocks the member H4 upon its pivot rod H5, Fig. 2. Member II4 carries upon its arm II 6 a jockey blade 89.which now holds in adjusted position the six signal storage slides 88. Locking the slides 88 permits overlap, a second code signal being stored in swords 86, after which lifting of the blade 89 will permit the slides 88 to respond to springs 85 acting through swords 86 and H3 and T- levers 81 to position the live slides 88 in accordance with the marking or spacing nature of the five impulses of the stored code signal and to position the sixth slide 88 into marking position in accordance with the marking condition of magnet 45 and its armature 12 at the instant of reoperation of cam 53 and cam follower I I 0. The

received signal 'and the marking nature of the tain the arm I 3I in rocked position.

two windings of which I60 has a continuouspolarizing current sufiicient to hold its armature attracted and sufllcient to re-attract its armature after a small" angular movement permitted by engagement of members 69 and I0, Fig. 4, after release of armature II when member 69 is in blocking position.

Release of armature 'II' by magnet 64 is effected by a current in the second winding I 63 of magnet 64 under control of the multiplex distributor over conductor I9, segment I64 and brush I65, the current received from the multiplex distributor being in reversed magnetic eifect compared with the magnetic effect of the described polarizing current, so that the magnetism of magnet 64. is reduced or cancelled by receipt of the signal from the multiplex distributor, and armature II is released by reason of reduced or neutralized magnetism. Should the cam sleeve 38 be in stop position; holding the follower IN and latch 69 in obstructing position, armature lever I0 will move slightly to engage the latch 69 and shortly thereafter will be re-attracted by magnet 64, when the signal from the multiplex distributor is terminated. This reverse method of operating an armature is suited to the conditions herein described because a quicker response of armature II is attained compared with its response to direct energization of magnet 64. Release of armature II permits its attached arm I0, Fig. 4, to move the detent 63 of sliding clutch member 6| so that cam sleeve 40 is started and is driven with ample power by its toothed connection to the motor shaft 35. The first operation by cam sleeve 40 is effected through cam 65, which engages and moves momentarily its follower I 2| pivoted on rod I22 and having an arm I23 bearing a stud which operates a link I24 to carry pivot rod I28 and its six transfer members I30 into engagement with the six slides 88, thereby rocking the members I30 upon the rod I28 in code combinational manner and rocking the bell crank arms I3I, Figs. 3 and 10, upon their common pivot rod I34, each such arm having a detent engaging an individual jockey I35 to re- A bell crank arm I32, upon each arm I3I, controls an electrical contact member I33, and thus sets up an electrical storage corresponding to the mechanical storage in slides 88, so that the five combinational impulses are registered upon five electrical contact members I33 and are connected to multiplex distributor segments for transmission over a multiplex channel The sixth condition is set up upon a sixth contact member I33,,No. 6, Fig.1, in response to the position of the No. 6 sword II3, Fig. 3.

The brushes of the multiplex distributor now transmit to the multiplex channel the signals set upon the five contact members I33, Nos. 1 to 5. During such transmission the cam 53 engages its follower roller 88 and restores the latch member 54. Cam sleeve 38 then reaches its stop position in whiclrposition cam 55 operates follower IOI extending the spring I03 and pressing the finger 69 against the end of armature lever I0.

Sleeve 40 then performs its second operation effective through cam 86, which engages and rocks its cam follower I40 momentarily. Member I 40 is pivoted at I and bears a finger I44 projecting into engagement with a yoke lever I42 pivoted upon pivot rod I34, which is the common pivot rod of all arms I3I'. The momentary motion of member I40 is imparted to member I 42 which carries a blade I43 common to arms Nos. 1 to 5 of the six signal arms I3I, The blade I43 engages any arms I3I, Nos. 1 to 5, which have been elevated by transfer members I30 and depresses all engaged arms into spacing position as shown in the drawings where all depressed arms are retained by the individual jockey springs I35,

so that the electrical storage of the code signal transiently efiective upon contact members I33, Nos. 1 to 5, is deleted. Arm I3I', No. 6, is not so restored. since the normal position of that arm is marking position.

Cam sleeve 40, as a final controlling act efiecx tive through cam 81 and its cam follower I45, rocks the shaft Ill and restores-armature II and its armature lever I0 into resting position, as shown in Fig. 4, permitting detent 68 to assume its locking position in the path of lever I0 and bringing the armature II near the polesof magnets 64 so that the polarizing magnetic energization of magnet 64 seizes and holds the armature II, thus holding clutch detent 63 in position to be engaged by crown cam 68.

The last act of the cycle of the A extensor oc-- curs when the crown cam 68 upon clutch member 6| engages detent 63, resulting in sliding the member 6| out of engagement with clutch member 60, thus stopping the rotation of member 6| and of cam sleeve 40. Jockey lever I82, urged by, spring IBI, presses its roller cam follower I83 into a notch in cam I84 on sleeve 40, operating to force sleeve 40 into its stop position and to prevent clutch 59 from grinding.

Structure of B errtensor machine and cam follower-206 pivoted at 201. To the cam follower 206 is fixed the armature 208 of magnet 2I0.

Cam sleeve 204, Figs. 7 and 14, bears six cams 2| I, five of which are code combinational cams having individual bell crank followers 2I2 each controlling a combinational code contact pair 2| 3 and each having a latch end 2 engageable by an individual one of five bell crank latches 2I5 mounted on a common pivot stud 2I6. A sixth bell crank follower 209, Fig. 14, mounted upon pivot stud 2II common to the five followers 2I2, is similar to followers 2I2 except that it has no latch end 2I4 nor latch 2I5, and it controls a stop impulse contact pair 2 I8.

Cam sleeve 204 bears also a cam 2I9 having a followerk220 pivoted on stud 2i! and controlling a contact pair 22I. Also on cam sleeve 204 are twin cams 222 of three radial dimensions and a cam 228 controlling a follower 224 pivoted on common stud 2H and bearing a bail blade 225 which spans the five bell crank followers 2I2 of the five code combinational cams 2H and of the five latches 2| 5.

Upon the frame of the machine 226, Fig. 11, are mounted five code combinational signal impulse receiving magnets 230 each having individual armatures 23I, sliding rods 232, pivoted latches 233, and signal impulse storage members 234. The five storage members 234 are pivotally mounted upon a common stud 235 and have individual operating arms 236 shaped to engage individually arms of the five bell crank latches 2I5.

The mentioned twin cams 222 have twin followers 239 formed as extension ends of a cam follower yoke 240 having both arms pivoted upon stud 2I1. Yoke 240 carries a bail. blade 24I spanning the five operating arms 236. Spring 242, Fig. '1, urges the follower yoke 240 to hold its bail blade 24I against arms 236, but is weaker than any one of the five springs 243, so that any one of the springs 243 may rotate its associated member 234 to overcome the spring 242 and rotate the followers 239 into engagement with cams 222, in response to a receivedmarking signal impulse.

Operating yoke 240, through an extension member 241, Fig. 12, engages lever 244 pivoted at 245 and controls the lever 244 through a spring 246 and an adjustable striker screw 248. An arm 2490f the lever 244 has its end positioned to block movement of cam follower 206, thus preventing magnet 2I0 from operating the member 206 and clutch 202, Fig. 8, unless at least one impulse storage member 234 is set to marking position, thereby setting bail blade 24I into its median position as will be described, and moving arm 249 of lever 244 out of the path of 9. lug 254 on cam follower 206.

Referring to Fig.1, the B extensor I4 has its five magnets 230 connected in series with battery 250 and resistor 25I and through cable 23 to segments 1 to 5 of multiplex distributor 22. Segment 252, No. 6, of the distributor 22 is connected through local conductor 24 to magnet 2! in series with battery 253. A retransmission circuit extends from battery 255, resistor 256, code contact pairs 2 I 3, and start-stop contact pair 2 I 8, closed contactor pair 251, local conductor 25, windings 26 of magnet 21 in A extensor I2, extension line conductor 28 to substation I6 and through break key 258, contacts of transmitter 259, slow-to-release relay 260, and selector magnet 26I to ground return. A further circuit for echo suppression includes battery 262, resistor 263, windings 264 of magnet 21, local conductor 29, contact pair 22I, and ground return.

Operation of B extensor machine Brushes 265 in distributor 22 pass over segments 1 to 5, and magnets 230 are energized in combinational manner moving the associated triggers 233 and storing the marking signals in storage members 234. Storage members which have been operated in response to marking signal impulses move latches 2I5 to a mean position without effect and move bail blade 24I and yoke 240 to the effect that yoke 240 operates lever 244 and removes its blocking arm 249 from the path of extension 254 on cam follower 206.

Brushes 266 then engage segment 252, No. 6, and cause energization of magnet 2I0, which operates armature 208 and cam follower 206, to operate the clutch 202 and to start the cam sleeve 204.

Cam 2I9 permits its follower 220 to close its contact pair 22I, thus energizing magnets 21 through winding 264 and rendering the magnets 21 unresponsive to signals in line conductor 28. Cams 222 then present a minimum radius and permit followers 239 and bail blade 24I to release all operated storage arms 236 which individually operate corresponding latches H5 and release corresponding bell crank followers 2I2, whereupon cams 222, by highest radius, operate yoke 240 and bail blade 24! to restore all operated storage members 234 into latched relation with the triggers 233. Yoke 240 also restores lever 244 and arm 249 and relocks cam follower 206.

At this time cam follower 209 .and contacts 2I8 have transmitted a starting impulse. Cam followers M2 and contacts 2I3 now transmit code signal impulses over the line circuit including battery 255, resistor 256, code contact pairs 293, local conductor 25, winding 26 of magnets 21, extension line conductor 28, and substation I6 to ground.

After transmission of the code signal impulses, cam follower 209 closes contact pair 2I8 for the stop signal impulse and cam 2I9 operates its follower 220 to reopen contact pair 22I.

' Should brushes 265 not operate any magnet 230 by a received marking signal impulse, the ensuing impulse from segment 252 will energize magnet 2I0, but armature 208 will remain blocked by I member 249, clutch 202 will not be operated, and

a blank" code combination received over the multiplex channel 2| will be suppressed and will not be retransmitted over the extension line conductor 28.

Break signal structure The break signal structure comprises in part several elements encountered above; namely, break key I56 and slow-to-release relay I58 at substation I5,

similar equipment

258, 260 at substation I6, Fig. 1, cam 56 andfollower arm IIO, rocking shaft III, Figs. 2 and 3, operating arm II2, sword Il3, T-lever 81, No. 6, storage slide 68 No. 6, transfer element I30 No. 6, bell crank lever I3I No. 6, contact member I33 No. 6, Figs. 1 and 3, local conductor I18, Fig. l, and contact pairs I54 and 251, Fig. 1.

Additional structural elements pertaining to the break signal system are illustrated in Figs. 7, 9, 11 and 12; namely, a cam 300 on cam sleeve 204, Figs. 7 and 11, having a follower 30I pivoted on common pivot stud 2" under tension of spring 302 and carrying upon a movable pivot 303 a driving pawl 304 and a rocking member 305 urged by a spring 306 against a stop lug 3 I0 and having a detector bail blade 301, which is positioned to engage undercut lugs 308 formed on bell crank latches 2I5 Nos. 1, 2, 4, and 5, when in latching position, as shown, and to engage lug 309, Fig. 9, on bell crank latch 2I5 No. 3, when that latch is in nonlatching position by control of its associated

impulse storing member

234, 236, after receipt of a No. 3 signal impulse of marking nature. Bail blade 301, when operated, will engage at least one of the five

lugs

308 and 309, except that when latches 2I5 are set for the code combination, marking, marking, spacing, marking, marking, or figures shift code signal, the bail blade 301 will pass under all lugs 308 and over the lug 309 without engaging any of the said lugs. Any other code signal may be chosen in place of the figures shift codesignal here described for illustration.

Upon a stud 3, Figs. 7 and 12, is rotatably mounted a cam member 3I2 having a cam apex 3I3, a stop pin 3, a series of ratchet teeth 3I5, and r. retractile spring 3I6 urging the cam member and its stop pin 3l4 against a shoulder of a stop arm 3I8 pivoted upon the stud 3II and I adjustable by a clamping member 3I9, which passes through a slot 320 in a frame member 3". Ratchet teeth3l5 are engaged for propulsion by driving pawl 304 and are engagedfor retention by detent pawl 322 pivoted at 323 under tension of spring 324 and having an extension 325 in the plane of the driving pawl 304. Attached to rocking member 305 is an operating arm 326 having an extension 321, which passes under the pawl 304.

Cam member 3I2, when operated in successive steps, causes its cam apex 3| 3 to operate a bell crank cam follower 330 pivoted at 33I and having an operating contact pair I 54 in Figs. '1 and 11, appearing in circuits as I54 in I3, Fig. 1, and 251 in I4, Fig. 1.

Break signal annunciators, which may be either of visible nature or audible, or both, are provided at 333 and 334 in substations I5 and I6, respectively, Fig. 1, under control of slow-torelease relays I58 and 260, respectively.

Break signal annunciators are provided also at 336, 331, 338, and 339 in the central omces, Fig. 1. machine are operated by lever I33 No. 6 and control an

annunciator

336 or 338, Fig. 1. (3ontacts 34I, Figs. '7 and 11, in, any B extensor machine are operated by follower 330 and cam apex 3I3.

Break signal operation Function of the break signal system is to operate a signal device 334 at substation I6, Fig. 1, in response to operation of break key I56 at substation I5. With cam member'3l2, Fig. 7, as shown, with relay 260, Fig. 1, adjusted for a delay of .2 second and with transmission at 390 operations per minute, the key I56 must be held open for one second to operate the signal device 334 and must be held open thereafter as long as continuous operation of the signal device is desired.

When key I56 is maintained open, magnet 45, Fig. 1, is ole-energized and remains in de-energized condition, starting the cam sleeve 31, Figs. 2. 3, and 10, and maintaining it in continuous rotation, and in each such rotation adjusting all swords 86 and H3 to spacing position and setting all contact springs.l33, Nos. 1 to 6, inclusive, to spacing position. At each rotation of multiplex distributor brush I61, transmission of a permutation code signal, namely: marking, marking, spacing, marking, marking, is effected from marking battery I12 to resistor I13, contact I15, contact spring I33 No. 6, now in spacing position, local conductor I18, contacts I33 Nos. 1, 2, 4, and 5, and cable I8 ,to multiplex segments I, 2, 4, and 5, and from spacing battery I16 through resistor I11, contact and spring I33 No. 3, and cable I8 to multiplex segment No. 3.'

Receipt of the described transmitted permutation code signal in the B extensor I4 results in tripping the triggers 233, Nos. 1, 2, 4, and 5, Fig. 7, and starting the cam sleeve 204. Cam 222 and cam follower 231 permit springs 243 and operating arms 236 to operate latches 2I5, Nos. 1, 2, 4, and 5, clearing all lugs 308 from the path of bail blade 301, and while follower arm 239 remains within the notch of cam 222, the cam 300 permits its follower 30I to rotate, causing the driving Contacts 340, Fig. 13, in any A extensorv pawl 304 to rotate the cam member 3I2 one step, where it is held by detent 322, after which cam follower 30l is retired by cam 300. Repeated reception of the described "figures shift code signal" advances the cam member 3I2 in repeated steps until pawl 304 engages the last ratchet tooth 3I5, and apex 3I3 operates its follower 330 toopen the contacts 251 in I4, Fig. 1. Repeated transmission of figures shift code signal must continue further until, after .2 second, the relay 280 releases its armature, and the signal device 334 becomes energized and will continue energized as long as key I56 is maintained open.

Upon reclosure of key I56, a continuous marking signal is transmitted over extension line conductor I1, the signal in the multiplex channel responsively changes to marking nature for the remainder of the instant cycle of the A extensor. B extensor I4 therefore registers a code signal which may be for T, M, N, V or "letters shift,"

depending upon the number of impulse intervals of the instant cycle of the A extensor following the change from spacing to marking condition of the transmitter,-and upon operation of cam follower 30I, the bail blade 301 engages at least one lug 308 as a fulcrum, upon which fulcrum the rocking member 305 is rocked by power received through movable pivot 303 from spring 302. R0- tation of member 305 lifts arm 326 and lug 321 and thereby lifts pawl 304 which in turn engages and lifts detent 322, releasing the cam member 3I2 which is returned by spring 3I6, releasing its cam follower 330 and reclosing contact pair 251 in I4, Fig. 1, thus reenergizing relay 260 and terminating energization of signal device .334.

Transmission of the break signal has been effected by a prolonged interval of spacing signal in the extension line conductors, during which a permutation code signal has been repeated several times in the multiplex channel. The prolonged spacing signal is not one of the thirty-two usable signal combinations of a start-stop permutation, diifering as it does from the blank combination by including no rest or stop pulse. It is not one of the thirty-one usable combinations of a multiplex code, but corresponds to the idle condition of a multiplex channel, which is not a signaling condition. Thus, the break signal which traverses the extension lines belongs neither to the start-stop nor the multiplex code, and is therefore an ultra-code signal which produces, through, the use of suitable translating devices, a repetition of a predetermined codesignal of the communication code of signals in the multiplex channel.

A break signal originating on extension circuit I1 either by key I 56 or by an accidental break in theline I1 will operatecentral

oflice signal devices

336 and 331, while a break signal originating on extension circuit 28 either by key 258 or by an accidental break in the line 28 will operate central oflice signaldevices 338 and 339. In each central" office,

signal device

336 or 338 identifies tacts I54 by ratchet cam 3I2 have been accomplished. The receiving printer at station I6 represented by selector magnet 26L will thus be placed out of correspondence with the home recorder at station I 5, represented by selector magnet I59, if the printers had been operating previously in the letters shift" condition. Compensation for this condition may be had in an operating routine according'to which the operator at the message transmitting station, such as station l5, before sending any character printing signals, sends a signal for placing both printers in the desired letters shift or "figures shift condition.

The placing of one recorder out of correspondence with the other, upon operation of the break signal key, may b obviated by providing that the code signal combination to be transmitted in the multiplex channel shall correspond to,the instant case shift condition of the recorders, and therefore to the last transmitted case shift signal, instead of being a predetermined, invariable signal combination. A system for automatically generating either of two case shift signals according to which of those signals had been most recently transmitted, the system being readily adaptable to the apparatus of the present invention, is disclosed in copending application Serial No. 167,163: filed October 4, 1937, by L. M. Potts.

Specificextensor machines and specific circuits have been described in this specification to illustrate the invention, but other mechanical devices may embody the invention equally well and efiect the desired results in satisfactory manner within the scope of the invention. 7

What is claimed is:

1. A method of transmitting a break signal in multiplex extension circuit operation which comprises transmitting a break signal in the form of a prolonged ultra-code signal, translating the ultra-code signal into a predetermined code signal of the code of communication code signals, and transmitting the selected code signal repeatedly.

2. A method of transmitting a break signal in a multiplex extension circuit system which comprises transmitting a break signal in the form of a repeated predetermined code signal of the code of communication signals, translating the repeated code signal into a prolonged signal of ultra-code nature, and transmitting the prolonged signal in an extension circuit of the system.

3. In a multiplex extension circuit system, a plurality of stations, a multiplex channel connecting two of said stations, an extension line connecting one of said two stations to a further one of said stations, means for transmitting a prolonged break signal over said extension line, and means responsive to receipt of said prolonged break signal for transmitting recurrently over said multiplex channel a predetermined code signal selected from the multiplex channel communication code of signals.

4. In a multiplex extension circuit system, a plurality of stations, a multiplex channel connecting two of said stations, an extension line connecting one of said two stations to a further one of said stations, means for transmitting recurrently over said multiplex channel a predetermined code signal selected from the multiplex channel communication code of signals, and

- means responsive to said recurrently transmitting means for transmitting a prolonged break signal over said extension line.

5. In a multiplex extension circuit system, a

plurality of stations, a multiplex channel connecting two of said stations, an extension line connecting one of said two stations to a further one of said plurality of stations, means for transmitting over said extension line permutation signal impulses of a predetermined communication code signal accompanied by an ultra-code signal impulse of predetermined nature, further means for transmitting over said extension line repeatedly and continuously the permutation signal impulses of said predetermined code signal accompanied by a further ultra-code signal impulse of other than said predetermined nature, and translation means responsive to said further ultra-code signal impulse to transmit repeatedly into said multiplex channel a different predetermined code signal.

6. In a multiplex extension circuit system, a plurality of stations, a multiplex channel connecting two of said stations, an extension line connecting one of said two stations to a further one of said plurality of stations, means for transmitting repeatedly over said multiplex channel a code signal constituting one of a code of communication code signals, counting means responsive to said code signal when repeated, and means controlled by said counting means and effective to transmit an ultra-code signal over said extension line.

7. In a multiplex extension circuit system, a plurality of stations, a multiplex channel connecting two of said stations, an extension line connecting one of said two stations to a further one of said plurality of stations, means for transmitting repeatedly over said multiplex channel a code signal constituting one of a code of communication code signals, rotary counting means responsive to said code signal when repeated, means controlled by said counting means and effective after a predetermined number of counts to transmit an ultra-code signal over said extension line, and adjustment means rotatable coaxially with said rotary counting means for altering the said number of counts.

8. In a multiplex extension circuit telegraph system, a multiplex channel, a counting member, electrical contacts controlled by said counting member when in a predetermined position reached through successive counting operations, means responsive to a predetermined code signal received over said multiplex channel and controlling said counting member to effect successive counting operations, a simplex extension line including said electrical contacts, and mechanism in said extension line responsive to control only by said electrical contacts.

9. In a start-stop receiving device, a plurality of permutation members, a first cam sleeve, means for starting said first cam sleeve into operation in response to a received signal, means operable selectively by said first cam sleeve to set predetermined ones of said members according to received signals, a second cam sleeve,

' cording to received signals, a second cam sleeve,

means controlled by said first cam sleeve to start a,avo,sso

said second cam sleeve, and means operable by said second cam sleeve in response to a received signal to change the electrical condition of some of said electrical retransmission members.

11. In a multiplex extension circuit telegraph system, a central station, a multiplex transmission system terminating in said central station,

a normally closed extension circuit terminating in said central station, first repeating means connected to said multiplex system and to said extension circuit responsive to a prolonged open condition of said extension circuit and eflective to transmit a repeated predetermined code signal into said multiplex transmission system, second repeating means connected to said multiplex system and to said extension circuit responsive to a repeated predetermined code signal received from said multiplex transmission system and effective to transmit a prolonged open condition into said extension circuit, a first annunciator device connected to said first repeating means, operative when said first repeating means is responding to the prolonged open condition of the first-mentionedextension circuit, and a second annunciator device connected to said second repeating means, operative when said second repeating means is transmitting into the second-mentioned extension circuit a prolonged open condition.

12. In a multiplex extension circuit system, a start-stop extension line, a multiplex channel,

, storage means for receiving and storing a code signal from said multiplex channel, retransmitting means for retransmitting said stored code signal into said extension line under control of said storage means, starting means controlled periodically by said multiplex channel to start said retransmitting means, and wholly mechanical blocking means for preventing operation of said starting means and controlled by said storage means to unblock said starting means when a signal is stored in said storage means.

13. In a multiplex extension circuit system. a simplex extension line. a multiplex retransmitting channel, a multiplex receiving channel, a retransmission mechanism having a winding in said extension line to retransmit signals into said retransmitting multiplex channel. a receiving mechanism having windings in said receiving multiplex channel and having contacts responsive to signals in said multiplex receiving channel to retransmit signals into said extension line. echo contacts in said receiving mechanism, means for operating said echo contacts and for holding said echo contacts in operated condition whilev said receiving mechanism is transmitting, and

a circuit including said echo contacts and a winding in said retransmission mechanism and effective to render said retransmission mechanism unresponsive to signals in said extension line.

14. In a multiplex extension circuit system, a start-stop extension line, a multiplex channel.

means to receive from ,said start-stop channel transmitting means and eil'ective to unblock said retransmitting means responsively to receipt of eachreceived code signal.

16. In a multiplex extension circuit system, a

start-stop extension line, a multiplex channel,

first storagemeans, receiving means for receiving a code signal from said multiplex channel a and for storing the'" received signalin said first storage means, second storage means, transfer' means for transferring said stored code signal into said second storage means, retransmittlng means for retransmitting said stored code signal into said extension line under control of said second storage means, and blocking means controlled by said receiving means for blocking said retransmitting means and eflective to unblock said retransmitting means responsively to receipt of each received code signal.

17. In a telegraph repeater, .a start-stop re- 1 eeiver, a multiplex retransmitter, a constantly rotating shaft, a first cam member, first means responsive to a received signal to couple said first cam member to said shaft, a second cam member, second means controlled by said first cam member to couple said second cam member to said shaft, a third cam member, third means controlled by said retransmitter to couple said third cam member to said shaft, and further means controlled by said second cam member while in stop position to prevent operation of said third means.

18. In a telegraph repeater, a rotary member,

means'responsive to a received signal to start said rotary member, a retransmission control device, electromagnetic means to start said retransmission controldevice at regular periodic intervals, and means carried by said rotary member to render ineffective said electromagnetic means.

19. Ina telegraph repeating system, means to register severally the impulses of a received code signal oi a plurality of impulses, and means to retransmit for each registered code signal a corresponding code signal of a smaller plurality of impulses which impulses for some received code signals correspond to a series of impulses embodied in the received and registered code signal but which impulses for one predetermined received code signal vary from the series of impulses comprising the received and registered code signal.

20. In a multiplex extension circuit system, a start-stop extension line, a multiplex channel,

storage means for receiving and storing a code start-stop extension line, a multiplex channel,-

storage means for receiving and storing a code signal from said multiplex channel, retransmitting means for retransmitting said stored code signal into said extension line under control of said storage-means, electromechanical starting means fpr said retransmittlng means energizable periodically under control of said multiplex channel irrespective of the presence or absence of signals in said storage means, and wholly mechanical means for blocking the mechanical portion of said starting-means and controlled by saidstorage-means to unblock the mechanical portion of said starting means when a signal is stored in said storage means.

22. In a multiplex extension circuit system, a

start-stop extension line, a multiplex channel,

electromagnetic means for registering a code signal received from said multiplex channel, mechanical storage means controlled by said registering means for storing a code signal registered thereby, retransmittlng means for retransmitting said stored code signal into said extension line under control of said storage means, electro mechanical starting means for said retransmitting means energizable periodically under control of said multiplex channel irrespective or the presence or absence of signals in said storage means, and wholly mechanical means for blocking the mechanical portion of said starting means and controlled by said storage means to unblock the mechanical portion of said starting means when a signal is stored in said storage means.

23. In a multiplex extension circuit system, a multiplex system, a start-stop extension line, means to receive from said multiplex system and to store mechanically a code signal, retransmitting means to retransmit said stored signal to said start-stop extension line, and means associated with said retransmitting means and independent of any electrical signaling impulses in said multiplex system to reset said storing means to efiect deleting of a retransmitted code signal from said storing means.

24. In a multiplex extension circuit system, a multiplex system, a start-stop extension line, means to receive from said multiplex system and to store mechanically a code signal, retransmitting means to retransmit said stored signal to said start-stop extension line, and means wholly controlled by said retransmitting means to reset said mechanical storing means.

25. In a multiplex extension circuit system, a multiplex system, a start-stop extension line, means to receive from said multiplex system and to-store mechanically a code signal, retransmitting means to retransmit said stored signal to said start-stop extension line, and means wholly controlled mechanically by said retransmitting mitting the prolonged signal in an extension circult of the system.

27. A method of transmitting a break signal in multiplex extension circuit operation which comprises transmitting in an extension circuit a break signal in the form of a prolonged ultracode signal, translating the ultra-code signal into a predetermined code signal of the code of communication code signals, transmitting the lected code signal repeatedly in a multiplex channel, translating the repeated code signal into a prolonged signal of ultra-code nature, and transmitting the resulting prolonged signal in another 61" extension circuit.

28. A method of transmitting a break signal in multiplex extension circuit operation which comprises transmitting in an extension circuit a break signal in the form of a prolonged ultra-v 10; code signal, translating the ultra-code signal into a predetermined code signal of the code of communication code signals, transmitting the selected code signal repeatedly, translating the code signals in excess of a predetermined num- 152 her into a prolonged signal of ultra-code nature, and transmitting the resulting prolonged signal in another extension circuit.

29. In a multiplex extension circuit system, amultiplex channel, an extension circuit, and a re-' transmitting device interconnecting said channel and said extension circuit, said retransmitting device including signal responsive means controlled by signals received from said multiplex channel, signal transmitting means for im- 25. pressing signals upon said extension circuit, me-

chanical storage means interposed between said signal responsive means and said signal transmitting means having a storing position in which signals from the multiplex channel are stored in said storage means and a transferring position in which stored signals are transferred to said transmitting means, and means to retain said storage means in an intermediate position until said transmitting means is ready to receive a transferred signal.

30. In a multiplex extension circuit system, a start-stop extension line, a multiplex channel, first storage means, receiving means for receiving the code signal from said extension line and for storing the received signal in said first storage means, second storage means, transfer means for transferring said stored code signal into said second storage means, retransmitting means for retransmitting said stored code signal into said 4%. multiplex channel under control of said second storage means, and means controlled jointly. by said receiving means and said multiplex channel for setting in operation said retransmitting means. i 50 31. In amultiplex extension circuit system, a start-stop extension line, a multiplex channel, first storage means, receiving means for receiving the code signal from said extension line and for storing the received signal in said first storage means, second storage means, transfer means for transferring said stored code signal into said second storage means, retransmittin'g means for retransmitting said stored code signal into said multiplex channel under control of said second storagemeans, and means controlled primarily by said receiving means and secondarily by said multiplex channel for setting in operation said retransmitting means.

32. In a multiplex extension circuit system, a start-stop extension line, a multiplex channel, first storage means, receiving means for receiving the code signal from said extension line and for storing the received signal in said first storage means, second storage means, transfer means for transferring said stored code signal into said second storage means, retransmitting means for retransmitting said stored code signal into said multiplex channel under control of said second storage means, means controlled periodically by 75 "said multiplex channel and normally ineflective 2,270,889 for starting said retransmitting means, and

electromagnetic means for registering a code signal received from said multiplex channel, first mechanical storage means controlled by said signal registering means, second mechanical storage means controlled by said first mechanical storage means, retransmitting means for retransmitting said stored code signal into said extension line under control of said second storage means, and means controlled by said retransmitting means for timing the setting of said second storage means under control of said first storage means.

34. In a multiplex extension circuit system, a start-stop extension line, a multiplex channel, electromagnetic means for registering a code signal received from said multiplex channel, first mechanical storage means controlled by said signal registering means, second mechanical storage means controlled by said first mechanical storage means, retransmitting, means for retransmitting said stored code signal into said extension line under control of said second storage means, means controlled by said retransmitting means for timing the setting of said second storage means under control of said first storage means, and means actuated by said retransmitting means for resetting said first stor- I age means.

35, In a multiplex extension circuit system, a. multiplex channel, an extension circuit, and

' a retransmitting device, interconnecting said channel and said extension circuit, said retransmitting device including signal responsive means individual to each impulse of a signal combination controlled by signals received from said multiplex channel, signal transmitting means for impressing signals upon said extension circuit,

, and mechanical storage means interposed be tween said signal responsive means and said signal transmitting means having normal, storing and transmitting positions.

36. In a multiplex extension circuit system. a multiplex channel, an extension circuit, and a retransmitting device interconnecting said channel and said extension circuit, said retransmitting device including signal responsive means individual to each impulse of a signal'combination pressing signals upon said extension circuit, and controlled by signals received from said multiplex channel, signal transmitting means for immechanicalv storage means interposed between said signal responsive means and said signal transmitting means having normal, conditioned and actuated positions.

37. In a telegraph system, an incoming line, an outgoing line, and means for repeating signals from said incoming to said outgoing line including astart-stop receiving distributor, a continuously operable transmitting distributor, means controlled by said receiving distributor for initially storing signals received from said incoming line, normally locked means for intermediately storing signals received from said initial storing means, means controlled by said receiving distributor for unlocking and relocking said intermediate storing means, means for impressing signals upon said transmitting distributor, and means controlled jointly by said receiving distributor and said transmitting distributor for controlling said last-mentioned means according to the signal storage condition of said intermediate storing means.

38. In a start-stop receiving device, a selector magnet, signal registering means conditioned by said magnet in accordance with received signals, a first cam sleeve to position said signal registering means into operative relation with respect to said magnet, means controlled by said magnet to place said first cam sleeve into operation in response to a received signal; a second cam sleeve, means controlled by said first cam