US989529A - Conversation-meter for telephone systems. - Google Patents

Description

V G; W. LORIMER. i GONVBRSATION vIMIETFR POR TELEPHONE SYSTEMS.

APPLICATION FILED APR.13, 1906.

Patnted Apr. 11, 1911.

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CONVERSATION METER FOR TELEPHONE SYSTEMS.

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y G. W. LORIMER. .ooNvERsATIoN METER PoR TELEPHONE SYSTEMS. l APPLICATION FILED APR. 13, 1906'.l 989,529 Patented Apr. 11, 1911.

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APPLICATION FILED 'APR. 13, 1906.

Patented Apr.` 11, 1911.

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APPLICATION FILED APR. 13, 1906.

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GEORGE W. Lonrivrnn, or Promi, OHIO.

CONVERSATION-METER FOR TELEPHONE SYSTEMS.

To all 'whom it may concern;

Be it known that I, GEORGE W. LORIMER, a citizen of the United States of America, and a resident of Piqua, county of Miami, and State of Ohio, have invented a new and useful Improvement in Conversation.- Meters for Telephone Systems, of which the follow ing is a specification.

` y invention relates to conversation counters for telephone substations, and has for its object, in a message rate or meas- 'ured service method of charging for telephone service, to provide means whereby the subscriber-'may be permitted to record at his station, one by one, the conversations which he holds from it; to compel such recording to be done-as a means of securing the service, and to permlt this recording only at such times as the securing of the service recorded is made certain.

My invention is specifically set -forth herein as applied to a mechanical device for transmitting signals in an automatic tele# phone system, the signa-l transmitter herein shown and described being covered by my United States application No. 311,139, filed April 11, 1906, claims for the signal transmitter being carried by that application.

My invention is illustrated in the accompanying drawings, in which similar characters refer to similar parts throughout the several views, and in which- Figure 1 is a rear view of the meter and the associated telephone mechanism; Fig. 2

is a side view of the same; Fig. 3 is a conventional view of the circuit as adaptedto one system of transmitting and receiving speech. Fig. 4 is a conventional view of the circuit as adapted to. another ,system of transmitting and-receiving speech. Fig. 5 is a back View of the signal transmitting mechanism in greater detail than is shown in Fig. 1. Fig. 6 is a section of signal transmitting mechanism cn the line 6 of Fig. 7. Fig. 7 is a sectional View ofthe signal transmitting mechanism on the line 7 of Fig. 5. Fig. 8 shows circuits of the signal ltransmitting mechanism. Fig. 9 shows central oilice,y circuits associated with the substation circuits of Fig. 8 and co `5peratingV therewith.

I shall describe lirst the signal transmitting device, in connection with which my conversation meter is hereindescribed.

- 'Specification of Letters Pate-nt.

Application filed Apri1 13, 1906.

Patent-.eu Apr. i1, i911. Serial No. 311,468.

detail of the signal transmitting device: This signal .transmitter is designed for installation at a telephone substation operat.

equipment to connect its substation with any line desired. In ope-ration, the digit arms 41, 42, 43, 44, representing thousands, hundreds, tens and units respectively, are placedv upon those digitl points corresponding to the four digits respectively of the directory number of the telephone line with desired to connect. In Fig. 8 the device is shown set ready to call line No. 0286. The digit points `upon which the digit arms rest are connected to.f;ontact points 49, 49, etc., and a brushO, mounted upon an arm adapted to sweep around the circle of contact points and make electrical connection with each point in order. Points shown black are isolated. Brush 52 carried by `arm 51 makes contact with collector ring 53 and thus any contact point' connected with by brush 50 is -connected to conductor 54. Brush 50 and arm 51 are carried by shaft 55 which (see Figs. 6 and 7.),'through pinion 56,gear 57, pawl 58, sleeved ratchet 59, is driven, by mainspring, the movement of the gear train, and therefore of brush 50, being controlled by an escapement comprising worm wheel 61, worm 62, toothed wheel 63 and tinger 64, the finger64 being rigidly mounted with armature 65 which is operated by electromagnet 66, which is controlled from the centraloiiice in a manner to be described later herein.

In operating the signal transmitter, the

mainspring 3 is wound by giving the disk 2 a quarter turn counter clockwise, as viewed in F 5. This is done through link 67 by turning the disk 4. Knob 68 with transverse `handle 68 is rigidly atxed to shaft 69.

which shaft bears also the disk 1, and which shaft is normally'held in its posit-ion of rest by t-he spring 70. By turning shaft 69 counter clockwise a quart-er revolution, as viewed in'Fig. 5; the disk 1 engages the pin -5 which is fixed in disk 4, and thus propels disk 4 a quarter revolution, which pushes lthrough link 67 and thus propels disk 2 a quarterrevolution, which winds up main- V'iteferring to Figs. 5, 6, 7, 8vwhich show,-

spring 3the outer end of that spring bewhich it is j the gear' train controlled by the escapement 61, 62, 63, 64. The knob 68 may return immediately, however1 sineethe disk -1 may yleave pin 5, but upon returnoi:l -that knob and its attached disk 1 to normal, the latch 6- will drop into engagement with disk 1 and prevent a subsequent operation of the knob until after the complete return of disk 4'. This is effected by pin 7 in disk 4 and spring 8 on latbh 6. Latch 6 is held out of engagement with disk 1 by the-lifting of pin 7 on spring 8, which spring is'fixed in latch '6. When disk 4 returns to normal fully, latch 6 is again lifted out of engage ment with disk 1 and the knob 68 may be operated again.

I have described how mainspring 3 is wound by a quarter turn by the patron in inaugurating a telephone call. The disk 2 in rotating has lifted latch 11 from its notch 71, the movement of the latch having lifted the pin 10 fixed in thelatch 11 out of the notch 12 of the disk 13. The disk 13, worm wheel 61 and the pinion 56 are all integral with thevshaft 55, and when thus placed under tension of spring 3, the movement of all parts is controlled by the finger 64. The first two steps of this gear train are secured by mechanical Acontrol of the finger 64, the subsequent steps are electromagnetically controlled. -Upon the turning of the shaft 69 to inaugurate the call, the disk 72. iixed to that shaft was revolved and lifted the 'crank arm 73 which pressed against the armature 65, swinging it upon its pivot 74 and moving the finger 64 to the left, as viewed in Fig. 5, permitting the first step of the gear train to take place on the first application of the power of the spring 3 through the pawl 58 and associated parts. This preliminary step does not move the brush 50 from thev conducting pin 45, as it will be noted that the brush 50 projects beyond the conducting pin 45 a suiiicient distance to permit the arm 51 to move one step before causing the brush 50 toA clear that pin. Since the armature 65 is thus held locked bythe crank arm 73, so long as the knob 68 is out of its normal position, the knob 68 must perforce be returned to its normal ositionto further the progress. of the call inaugurated. Upon return of knob 68'and disk 72, crank arm 73 drops into the notch in disk 72 and releases finger 64 which under tension of its spring returns to its right hand position as viewed in Fig. 5, and ermits the second step of the arm 51 which) passes brush 50 into'contact with conducting pin 46.

y It will be observed that in the institution of the call, the patron operating the automatic substation signal transmitter first sets his digit arms to the directory number desired, and then is compelled to turn lthe knob 68 throughout an entire quarter revolution to cause the pawl 58 to engage the next tooth of ratchet 49, and then is compelled to restore knob 68, or to permit the restoration of that knob to normal by spring 70 in order that diskv72 may permit crank arm 73 to release armature 65 to control the escapement of the gear train placed under tension, and thus of the arm51 and brush 50, one revolu` tion of that arm and brush being required to effect connection with a desired line. Interference stud 75 upon hook lever 9 lies Within a notch in disk 2 when the hook lever 9 is up; consequently the hook 9 must be down in instituting a call, and, furthermore, it is positively locked down until disk 2 has completed such portion of its return as will permit the notch therein to register again with interference stud 75. Knob 68 novi is locked by latch 6 on diskA 1, andv the device is ing through :the escapement. A

The two preliminary steps ofthe brush,50 have placed it in contact with conducting stud 46 whence an electric circuit is closed as follows: 76, 77 7.8, 46, 50, 51, 52, 53,54, 87, 88, L1 and over line conductor L1 to the central office equipment, this beingithe signal to the central office that a call has been instituted. The signal is not sent until after the arm 51 and brush 5() have been placed wholly under control of magnet 66, which magnet is controlled by current impulses from the central office over line conductor L2 and thence over elements 79, 80, 81, 66,17, 18 and ground, the contacts 17,-18 being closed by the lelevated position of latch 11. The brush 50 in, moving around itscircle of contacts makes electrical connection with eachv in turn and offers a path from L1 to ground whenever it encounters a conducting contact stud whichl is associated with a digit point which at that time is connected with by digi't"' arm 41, 42, 43 or 44. The central o'Hice apparatus is so designed as to coperate with the substation transmitter asl follows: Current impulses are sent over line L2 to ground, successively energizing and deenergizingv electromagnet 66, thus permitting vwholly under control of, the magnet 66 act- 'brush 50 -to step around and successively connect with the points in its circle in proper synchronism with selective stepping devices in the central office, ,thel selective stepping devices being further controlled by ground circuits encountered upon L1. Thus when in the condition shown in Fig. 8, the

esegsae arm 51 revolves in response to control of electromagnet 66. the brushv 50 comes into electrical connection with the conducting point 49 when the central office stepping apparatus is in aposition corresponding to thousands, since digit arm 41 is set upon 0 thousands. In similar manner the positions of the digit arms 42, 43, 44 are signaled to the central office through the occurrence ofgrounds upon L1 in the travel of the brush 50 as controlled by impulses from the central otiice over L2..

, Referring now to Fig. 9: The complete lapparatus of the central ottice is not herein ydescribed as it is already publicly known or circles of contacts being substantial] y threel double rows. Movable brushes 93, 94, 95, 96, 97, 98 are pivotally mounted axially within the cylinder and are adapted to move over the rows of contacts. Brushes 93-94 are connected together and form substantially a double bridging brush for the upper double row of contacts.` 'The same is true of pairs of brushes 95-96 and 97k98.

The construction here described iswell .known in the art and is specifically set forth in the British patent cited. The brushes are.

mounted upon shaft 99 which' carries the clutch disk 100 and the clutch dog 101, the dog being controlled by the electromagnet 102; the brushes move continuously over the contacts when the dog is withdrawn from the clutch disk.

An auxiliary rotary ,switching device is shown controlled by the electromagnet 103. In this device is a double arc of waiting contacts. 1ML-105, etc., a pair of movable brushes 1064107 carried by the shaft 108 concentric with the waiting contacts, and the electromagnet 103 having an armature adapted to control the movement of the brushes over the contacts step by step. Such other of the elements of Fig.v 9 as are involved in the operation of the signal transmitter will be understood by the following description of the operation of the device.

The position of the brush 50 in Fig. Sis that occupied by that brush when the signal transmitter' is not in use. lt has been described that upon institution of a call, the brush 50 is set forward mechanicallytwo steps; that the first step is not sutlicient to cause the brush 50 to pass the pin 45, and that the second lstep of the brush 50 causes it to leave the pin and to pass into contact with the adjacent pin which is connected tov earth at the substation through conductor 76. In this position the circuit may be traced from positive side of battery through the relay helix 119 to L1 and thence through 88, 87, 54, 53, 52, 51, 50, 46, 78, 77, 76 to earth. As the device of Fig. 9 begins to revolve, the bridged brushes 93-94 connect the positive terminal of battery through contacts 91-92 to L2, thus completing a circuit over L2, 79, 80, 81, 66,17, 18, etc., to earth, energizing 66 and causing brush to take one step which breaks theleircuit through helix 119 just described and places the brush 50 in contact with the pin '47 which is an insulated one. As the brushes 93-94 pass farther, the circuit through them is interrupted at 94-92, and by the consequent denergization of 66 the brush 50 is advanced another step and now rests in contact with pin 48, which also is an insulated one. Next, the brushes 95-96 make connection with contacts 109-110 and a circuit is completed from the positive side of `battery through 111, 112, 109, 95, 96, 110,

113, 114, 103, and to earth, energizing 103 and causing the brushes 106-107 to step v.forward one step into connection with contacts 104-105 respectively, which are the contacts corresponding to the 0 thousand group of subscribers lines. Next, brushes 93-94 connect contacts 115-116 and brushes 97-98 simultaneously' connect contacts 117.-118; the former pair of brushes close a circuit from positive terminal of battery to L2 and thence through 79, 80, 81, 66, 17, 18, to earth, causing bi .ish 50 to make a step and to pass into contact with the pin 49, which is connected to earth at the sub.- station; by this movement of the brush 50, a circuit is closed from the positive terminal of battery through the relay helix 119 to L1, 88, 87, 54, 53, 52, 51, 50, 49, thence to the first or No. 0 point of the thousands digit indicator, and inasmuch as the thousands digit arm in Fig.' 8 is set upon that point, the circuit Ais completed to earth at the substation through 77-76, thus energizing the relay helix 119 and attracting the armature 111; by the attraction of the armature 111 the circuit, is closed from positive pole. of battery through 111, 121, 118, 98, 97. '117. 122, 123, relay helix 120 to negative pole i of battery, `which circuit is a locking circuit .to maintain the relay armature 111 independently of the continuance of the substation contact of brush 50. By this locking of the armature 111, the conductor 112 is isolated from the battery terlninal and further closng of the circuit above described as energizing magnet 103 is impossible; In the continuance of the motion of fthe brushes, the brushes v93-94 repeatedly energize and denergize magnet 66 and thus step theV brush 5() over the first quadrant of the signal transmitter, while brushes 97-98 hold closed thelocking circuit of the relay-wind,-

ing 120. As the brushes leave the twentyfirst cout-act ofv their respective rows, the.

locking circuit of the relay helix l120` is broken; the brush 50 at thistimehas passed' beyond the first quadrant of the signal transmitter and is entering the second' quadrant. As before, the brushes 93-94-send current impulses overthe line L2 to propel the brush 50, the brushes 9596 send current inpulses through 111-112 and thence through vwire 124 and 125 to some further device for intracted by energization of helix 119 and will be retained by energization of helix 120, thereby preventing further impulses, and thus determining the con-trol ofthe distant brushes acting to select in response to control by the hundreds digit arm of the signal transmitter in amanner analogous to brushes l06-107 in response to control of the thousands digit arm of the signal transmitter. The third and fourth quadrantsof the signal transmitter are controlled by a further device similar to that of Fig. 9,\ and the digital signals from the brush are similarly interpreted.

' lfVhen the brush 50 has made approxi-l mately its complete circle, the disk 2 will have returned nearly to normal and the hook lever 9 will be permitted to rise, giv? ing proper conditions for conversation.l

To review the mechanical conditions for instituting a call by means of 'the signal transmitter herein illustrated; (referring close of the initial movements, thedisk 1 isl to Fig. 1), the hook 9 must be downl and the disk 1 must be turned and restored; at'the in the position shown in Fig. 1, the latch .6

revolved counter clockwise a quarter turn;

at'the close of the transmission of the signal and when, sofar as the signal transmitter isA concerned, the telephone connection is complete and in readiness for conversation, the disk 1 will be locked by the latch 6, the disk 2 will have returned so nearly to its normal position as to permit the rising of the hook 9, and the latch 11 will remain elevatedby reason of the-engagement of its pin 10 with the edge of the disk 13.

'To the signal transmitter device thus de-- scribed, yI add the meter 39 with its controlling devices as follows: Push slide 22 has,

projecting push button 21 accessible to the two'notches adapted to be engagedby dogs 24 and 30. The slide 22 is carried inthe sleeve 27 and tends to hold its button 2h out- Ward by tension of a spiral spring. .The arm of the meter 39 -is pressed downwardy by aspiral spring and may be pushed upward y; bythe slide rod 29. The. slide rod 29 has kan outwardly turned end portion to interfere with the pin 3-7 upon the latch 6 whereby .the

latch 6 is prevented from lifting from the the slide rod 29 will lock the latch 6 against release of disk 1, will open the springs 14,

V15, 16 from each other, and will operate the arm of the meter 39. The lifting of-the rod 29 is accomplished by a crank arm upon the rocking shaft which carries" the crank arm' 28, the crank arm 28 beingconnected by pin and slotconnection with the push slide 22; the slide rod 29 may be operated therefore by pushing the button 21, resulting in registering the call, locking the disk 1 and opening the springs 14, 15, 16.

A call having been instituted and connection having been secured withl the desired line, the ,called subscriber answering will send `voice currents to the calling station. By reference to Figs. 3 and'4 it will be seen that if springs 14,15 and 16 were all in contact 'as would be true except for upward pressure of the stud 19 against-the spring 14,.the transmitter T will be Ashort-circuited and the receiver Rl will be shunted by-the resistance 20. The magnitude of the resistance 20 is such as ,to enable received speech to be heard in the receiver R,=while yet not great lenough to enable that receiver effectively to `be used as a magneto telephone transmitter. 4The condition ofithe substation set immediatelyupon calling, therefore, is that the Zcallinglsubscriber may hear the response of gthe'called subscriber and will be unable to engages the,disk 1 and the disk 2 has' been;`

orjreceiver, because of the closed condition "of 1125;?by-'path'y about each. Because of inspeaktoghim either through his transmitter structions to that effect, the vcalling subscribernow. will press the button 21. This 'will force the slide 22 in its guides, with two results. First, that the tooth 23 of the slide j22 will be engaged by the pin 24 dropping into it, thus lowering the shaft 25, which is vconnected with the pin 24 by means ,of the frame 26;A Removal of pressure fromthe "button 21 will leave'it lockedag'ainst return because of the engagement of 23 and 24, though' the spring 27 tends against that 'engagement to throw the button outward.- The second-result of this inward pressure kof the llltton 21 'is to rock the angle arm 28, lifting t shaft 29 l and operating the meter 39.

move thezspring 14,. The `counting of the.

meter, therefore, accompanied bythe locking of the slide 22, breaks and holds broken the contacts 111, 15, and 16, so releasing the transmitter from its short-circuit `and the receiver Vfrom its shunt. Conversation may now proceed, and upon its completion the restoration of the receiver -to the switch hook 9 will cause the latter to press upward the rod 25 to remove the engagement of 23 outward into its normal position. The conversation thus will have been charged upon the meter, and more than one count 'will have been prevented because of the inability of the subscriber to press the button more than once, even if he should attempt-to do so, by

`malicious intent or -thouglitlessness As the system is automatic andzthe connection has 'been broken at the central oilice as a response to the depression of the switch hook 9, a new call now may be instituted, with a repetition of the meter counting if the called subscriber responds and with no counting if he dpes not.

Should a malicious or careless person attempt to press 'the button 21 without instituting a call, and` thus to charge for a service not secured, his success will be prevented b v the engagement` of the catch 30 in another notch than 23 in the slide22; This notch faces in the opposite-direction from 23 and vis adapted to prevent an inward pressure unless the rod ,31, carrying the catchi30,- is

elevated.- This; will be true only when the disk 2 is nearly inl its normal position4 Such a position of that'fdisk is shown inFig. 1,

--and lin solrestingvthe lug 32 engages thel Vlower end ofthe" shaft 31 so holding the catch 30 outfof the slide 22 wheneverv the pawl 11 standsin the position shown iii-Fig.

1, which is the position permitted byithe4 gear train of the telephone set during a time of conversation resulting froiila call lby a patron at this station. Buta conversation resulting lfrom a call to this station will take place with the pawl 11 within its notch in the disk 2 and also with its pinflO engaging the notch 12 in the disk 13.l There is thus 'a mechanical difference' in the telephone set, between the conversations of a ,sent and a received call. The inclined plane 'p33 borne by the'pawl ll is adapted to slide behindthe rod 31when thepawl falls into the vnotches as described. In so doing the rod 31V has itslower part swung toward the observer viewing Fig. '1, permitting it to disk l to which the handle ofthe ,catch 30 in the slide 22, preventing any registry upon the meter by pressure on the button 21 when the pawl l1 is in its normal position. It will be noted that the spring 34C bears aga-inst the rodl, holding it normally in position to be engaged by the lug 32. Thebracket 35 is so mortised as to permitthe shaft 31to be' moved to clear the lu 32 when vthat shall be necessary.

The previously described operations will make clearthatvthe slide 22 is only freed by thev catch `30 when a call has been instituted, which time only is a proper one for a possible registry upon the meter.

Should a patron attempt to secure successive connections without more than one pressure upon the button 21 by holding this ltute such calls because of the engagement of the right angled end of the rod" 29 with the pin 37. The main spring 3 could 'not bc wound nor a call transmitted during -sucli a holding of the/pin 37, as in that position the pawl 6 willengage the shoulder of the device is directly attached.

Having thus. described my invention, what I claim as newgaiidmV desire to secure by Letters Patent is: l l

l.4 In a measured service telephone, a con'- versation "meter, manual actuating means therefor, andcall-sending means adapted.V

to be locked against operation during actual tion of such manual means.

2. In a measured service telephone, a conversation meter, manual. operating means therefor, call-sending means adapted to be locked during actuation of'said meter, and

-meansadapted to lock said meter against goperation during conversation.

i 3. In a measured service telephone, atalkf 'ing circuit, a conversation meter, a call-send- .ing device, a meter-operating device locked against operation when said talking circuit `i'sin condition for conversation, and means locking said call-sending device when said meter-operating device is actuated. 4. In a substation telephone, a conversation meter, an actuating device therefor, a call-sending device, a talking circuit, and means locking both said meter-actuating and said call-sending devices when said talking circuit is in use.

5. In a measured service telephone, a call-` sending device, a transmitter, a conversation meter and actuating means therefor, a shunt' about said transmitter adapted to be closed during operation of said call-sending device and to be opened during operation of said meter-actuating means, aii.d, \i'neans locking said meter-actuating meaflsidlrng couver;lisoI sation.

, device; a transmitter; a shunt for said trans- C transmitter; disabling means,

electrical switch prior to the operation of` 6. In a telephone set, a receiver, a transmitter, and a by-path for each; a conversation meter and actuating means therefor, a

call-sending device and means adapting both l said by-paths automatically to be opened. during conversation upon a received call, .and manually opened during' conversation upon a sent call. j

4 In a telephone set, a receiver, a transmitter, and a by-Npath for each; a conversation meter and actuating means therefor, a 'call-sending device and means adapted to close said ley-paths -on sendinga call, and to break said pathson recording a conversation. i

8. .In a substation telephone, a conversaf tion meter, .actuating means therefor, an 'electrical switch operated by said actuating a transmitter short-circuited by said said actuating means,'a switch hook, and means for locking said actuating means upon operation of said actuating means when said switch hook is elevated, and releasing said, actuating means when said switch hook is depressed.

9. In a substantion telephone, a switchhook, a conversation meter and a press-button therefor, a rotary circuit-changing automatic call-sending device and means locking said press-button except after operation of said call-sending device and while said switch-hook is elevated. 10. In a substantion telephone, a conversation meter, a press-button therefor, a callsending device and means locking said callsending device when said press-button is actuated. f

11. In a substation telephone, automatic impulse-governing means for sending a call,

for said call recording means, and means associated with said call sending means for unlocking said call recording means.

.V 12. In a substation telephone, a calling mitter and having an open contact controlled bysaid calling device, said contact .being adapted to close said shunt when said calling device is olf normal and to open said shunt when said calling device is in its normal position of disuse.

13. In a substation telephone, a speechtransmitter; a call-sending device; a shunt 5 for said speechtransmitter and controlled by said call-sendingI device, said call-sending device operating to close lsaid shunt when said call-sending device is off normal and to hold said shunt open vwhen said call-sending device is in its normal position of disuse; and further means v when said crll-senlding device 1s positioned to close said shunt.`

14. In a substation telephone, a speech means for said transfmeans for removing said transmitter; locking latch :tor said means;

for recording a call, lockil'g means' for openingl said shunt ment of the telephone hook.

15. Ina substation telephone, transmitter; shunt for said transmitter; a press-button for removing said shunt from said transmitter; a locking latch for said press-button; and-means whereby saidlocking latch is operated to release said pressbutton by the downward movement of the telephone hook.

16. In a substationl telephone, transmitter; a shunt. for said transmitter; shunt from said and further means whereby said locking latch isl operated to release said means upon ,the downward movement of the telephone hook.

17. In a substation telephone, a speech transmitter; disabling means for said transmitter; restoring means for said transmitter; call-sending means operating said disabling means upon the sending of a call; and locking means for said call-sending means, said restoring means operating said locking mea-ns upon the operation of said restoring means to lock said call-sending means upon the operation of said restoring means to restore said transmitter into service.

18. In a substation telephone, a speech transmitter; disabling means for said transmitter; restoring means for said transmitter; call-sending means o erating said disabling means upon the sending of' a call;lock ing means for said call-sending means, said restoring means operating said locking means to lock said call-sendingA means upon the operation of said restoring means to restore said transmitter into service; and further locking means for said restoring -means, said further locking means being operated to unlock said restoring means upon the downward motion of the telephone switchhook.

19. In a substation telephone, a speech transmitter; a shunt for said transmitter; a press-button for removing said shunt from said transmitter; a call-sending device operating to shunt said transmitter upon the sending of a call; and a locking latch for said call sending device, said press-button operating said locking latch to lock said call-sending device upon theressing of said button to remove said shunt rom said transmitter. l

20. In a substation telephone, a speech transmitter; a shunt for said transmitter; a press-button for removing said shunt from said transmitter; a call-sending device operating to shunt said transmitter upon the sending ofa call; a locking latch for said call-sendingdevice; said press-button opera 'speech a speechl ating Said locking latch to lock said. call.- Signed by me at Piqua, county of Miami, sending device 4upon the pressing of said State of Ohio, in the presence of two Witbutton to remove said shunt vfrom said transnesses. f I mitter; anda locking latch for said pressa GEORGE'W. LORIMERL 5 button, said 4button latch being operated to Witnesses:

unlock said button upon a downward 1no- I GEORGE A. VAUGIER, tion of the switc'hhook. ELBERT M. BELL.

Gopes of this patent maybe obtained for ve cents each, by addressing the Commissioner of ratents.

washington, n. c.

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