US1341998A - Telegraph system - Google Patents

Description

I P. M. RAINEY.

TELEGRAPH SYSTEM.

APPLICATION FILED AUG-6 1911..

1,341,998. PatenwdJune 1,1920.

2 SHEETS-SHEET l- P. M. RAINEY.

TELEGRAPH SYSTEM.

Armcmon FILED was. 1911.

PatentedJune 1,1920.

2 SHEETSSHEET 2 UNITED STATES PATENT OFFICE.

PAUL M. RAINEY, OF WEST HOIBOKEN, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEGRAPH SYSTEM.

Patented June 1, 1920.

Application filed August 6, 1917. Serial No. 184,641.

To all whom it may concern:

Be it known that I, PAUL M. RAINEY, a citizen of the United States, residing at \Vest Hoboken in the county of Hudson and State of New ersey, have invented certain new and useful Improvements in Telegraph Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telegraph systems and more particularly to improvements in apparatus and systems for so-called break service in connection with automatic systems, as printing telegraphs.

The principal object of this invention 1s to provide that following a break interruption and the sending of such predetermined arbitrary signals, the recomposing of telegraphic impulses into a printed message Wlll automatically resume at the exact point the message was interrupted and in the same case or style of type in which printing was progressing at the instant the message was interrupted in order to send such break signal.

In telegraphic service it is frequently necessary to interrupt a message in order to communicate orders or instructions usually relative to messages under transmission over the same circuit, and such communications ordinarily take place between operators or attendants at different telegraph stations. Interruptions of this character are commonly termed break or break in signals and are rendered necessary for various reasons as well understood in the art. In connection. with printing telegraph working commonly employed break signals may be briefly summarized as follows: Start, re-run, re-punch, stop and plant. Ordinarily these break signals comprise a predetermined number of strokes on an audible signal, or code flashing of a suitable visual signal. It is common practice to employ a code cycle which, operated once, indicates the first mentioned break signal start. When this code cycle is operated and repeated once it indicates the second signal; when operated and repeated a second time the third signal, etc., to cover the transmission of five or more signals.

In printing telegraphs it is usually desirable to arrange that reception of break signals take place while the receiving instrumentalities are in the so-called shift position, that is, when they are in the position for printing upper case letters or figures, as distinguished from lower case letters. The terms shift 5 and unshift are commonly employed in respectively designating such case positions of the receivlng printer. Break signals for the present class of telegraph service are usually initiated by a single manual operation, following which they continue automatically through a cycle of steps or operations which comprise: first, stopping the transmitter;

second, sending a code of impulses to shift the receiver mechanism or to insure that it is in the upper case; third, the sending of a code cycle of impulses corresponding with the signal selected by the manual operation;

of a break signal and before message send ing is resumed by the transmitter, action vill automatically take place to return the receiving mechanism of the printer to the case in which it was operating at the instant the message was interrupted.

Referring to the accompanying drawings, Figure 1 is a perspective view of a tape controlledtelegraph transmitter; and Fig. 2 is a diagrammatic illustration of the transmitter shown in Fig. 1, combined with other telegraphic equipment suitable for illustrating the present embodiment of this invention.

Referring to Fig. 1 of the drawing, a group comprising five sets of two position contacts designated by the reference character A serve as transmitting contacts for sending out various permutations of positive and negative currents corresponding with a well-known five-unit telegraphic code. A second group of five sets of contacts B are connected mechanically with respective sets of contacts in the group A whereby operation of a set of contacts in the group A effects operation of an associated set of contacts in the group B. The contacts comprising the group B perform certain operations in practising the features of the present invention, as will presently appear.

In order that the relatively heavy duty load necessary in operating the double sets of contacts A and B may be carried by mechanism independently of the pressure exerted by tracker pins against a perforated transmitter control tape, the arrangement shown in Fig. 1 has been provided. This arrangement comprises live lever arms a carrying pins 2 which cooperate with atransverse row of perforations in the tape 1, selectively to control the actuation of the contacts A and B, as will hereinafter appear. Each lever arm a movably carried by a shaft 5 is provided at one end with tracker pin 2, hinged thereto by means of a loose rivet 3 and at its opposite end it carries a member 7, hinged thereto by a rivet 6. The member "4' depends through a slotted opening in a plate 8, which is hinged at 9 to the free end of an arnature 12 of an eloctromagnet 10. During such time as the pin 2 rests against the under surface of the tape 1. the lower end of the member T will be held above the upper end of a movable contact member 29 at group A. Let it now no assumed that in response to action as will presently appear, the magnet 10 is energized to attract its armature 12 in which position it is shown in he drawing which is hinged at 13, whereby an obliquely positioned lifting member 15 hinged to the armature 12 at 9 is tl rust against the lower edge of the lever 4-, thereby raising the lever to clear the pin 2 from the tape 1. In moving forward the armature carries the pla e 9 longitudinally and thrusts its outstanding end. which is formed as a stepping pawl at 11, to rotate a ratchet wheel 14. By means of mechanism (not shown), the tape 1 responds to this movement of the ratchet wheel and is thereby stepped forward to the next position corresponding with perforations therein, representing a combination of impul. s to be transmitted. On the decnergisatitm of the magnet 10, and assuming the pin 2 encounters a perforation in the tape 1, action of gravity on the lever l thrusts the pin upwardly through the perforation. whereupon the. opposite end of the lever a lowers the member 7 to engage the contact 29 near its upper end. This engagement of the contact 25) will take place in advance of the full retraction of the plate 8 in response to action of a spring 17, and further retraction of the plate 8 presses the member 7 against the spring 29, deflecting it to separate from its normal contact spring 3 and to engage its forward contact 241-. This movement of spring 29 thrusts a spreader member 19 longitudinally to force a contact spring 4C9 forward to separate from its normal contact 54 and to engage its forwaro contact 44. At

a proper time, ope ation of the magnet 10 moves the plate 8 to withdraw the member 7, thereby releasing the contacts l9 and 29, and also lifting the outstanding end of the lever to withdraw the pin 2 from the tape 1, and to rotate the ratchet wheel 14 to ad vance the tape 1 another step.

It will be obvious that the tracker pin on encountering a non-punched portion of the tape 1 will accordingly retain the-outstanding end of the lever at in its uppermost position, irrespective of the lifting member 15 being released to rest on its back stop 16. This position renders the mem er 7 noneflective with the associated contacts in the groups A and B, since the elevated position of this member permits it to clear and pass over the upper end of the spring contact at the moment the plate 8 is retracted by the spring 17 during that movement step of a re ular operating cycle as already described. It will therefore be clear that the pressure exerted by the pin 2 against the tape 1 is only sutlicie t to (Wei-balance the lever 1 and such pressure is accordingly independent of the force exerted by the spring 17 in operating the contacts of the groups A and B. The tape 1 is accordingly protected against wear, which would otherwise result, and further protected at the edges of the perforations. due to the pin 2 being withdrawn and held clear before the tape is moved and also held clear until the tape has been ad *anced and brought to rest at a next position, whereupon the pin is released to pass in proper clearance alinement through a perforation when present in carrying out message code combinations.

Referring to Fig. 2 of the drawing a circuit arrangement for the transmitting contarts A. the special cont-acts B and the transniitt r magnet 10, is herein shown and designated in so far as may apply by reference characters corresponding with those employed in Fig. 1. A rotary type distributor E is included with the transmitting system to impart current impulses therefrom to a main line conductor 89. A mechanically operated code transmitter for imparting predetermined break signal impulses to the line 89 is shown at F and a relay 35 controlled in part by this code transmitter in turn controls the locking of the transmitter contacts A during break service intervals. Two relays 55 and are arranged to cooperate with the special contacts B and the code transmitter F in a manner to insure that following the sending of a break signal the receiver at a distant station (not shown) will resume printing in the case in which it was working at the instant the telegraphic message was interrupted to send a break signal.

In more specifically describing the present. system, the operations whereby telegraphic message impulses may be transmitted to a distant station by way of the main line 89 will first be considered. It may be mentioned that during message transmission the code transmitter equipment F remains inert in its normal position, which is the position shown in the drawing. In supplying current to energize the normal contacts 30 to 3 1 of the transmitter A, three paths may be traced from a bus conductor 63 included with a negatively poled source of grounded current 61. The branchings take place at the code transmitter F. The first path extends over contact members 7 O and 71 and a bus conductor 73 to contact stops 30, 31 and 33 of the group A; the second path extends from the bus conductor 73 (now nega- I tively energized as traced) by way of contacts 81 and 80, a conductor 83, contacts 101 and 100, and a conductor 103 to the normal contact stop 32 at A; the third path extends from the bus conductor 73, contacts 91 and 90 and a conductor 93 to the normal contact stop 34 of the contacts A. A grounded source of positively poled current 62 is connected by way of conductor 64: to the forward contacts 20, 21, 22, 23 and 24 of the transmitter contacts at A. The movable contact members 25, 26, 27, 28 and 29 of the transmitter group A, are respectively included with segments 75, 76, 77, 78 and 79 of the distributer E and are under control of the tape 1 to selectively respond to connect various combinations, or permutations of positive and negative current condition, to the five segments of the distributor E. It will, therefore, be apparent that, assuming the contactor or trailer arm 7 1 of this distributer to be rotated in a clockwise direetion, these segments will be successively connected to and disconnected from a main line conductor 89, which is included with a collector ring 88. Accordingly impulses of current corresponding with current polarities present on the segments 'to 79 will thereby be imparted to the line 89. After pasing the last segment 79 of the fiveunit group the trailer arm 7 4 establishes connection from a grounded current source 84: by way of segments 85 and 86, conductor 87 to a junction point 115, whence the circuit branches, over two paths, one of which may be traced by way of the contacts 110 and 111, conductor 116, the winding 37 of the relay 35, and conductor 18, through the winding of the transmitter control magnet 10 to earth; the second branch extends by way of contacts 38, winding 36 of the relay 35, conductor 18 and winding of magnet 10 to earth. The windings 36 and 37 of the relay 35 are connected differentially as indi cated. Therefore this relay remains inert under action of current just traced. Operation of the magnet 10 performs the contact restoring and tape advance operations as already described in connection with Fig.

1, whereby a next selection as predeterminedly perforated in the tape 1 effects the moving contact members 20 to 24 to prepare a next combination of current polarities at the segments 75 to 79 of the distributer E.

Referring to the break signal transmitter F, the operation of this portion of the transmitting service will now be described, and since code transmitters of this general type are well known in the art the various driving gears and mechanical parts not essential to a clear understanding of the present system have been omitted in order to simplify the drawing. Four cam wheels 95, 96, 97 and 98 are carried by a rotatable shaft (not shown) which is suitably geared to a second shaft operated by a spring motor drive under control of a radially movable sector 99. A suitable ratchet and pawl arrangement transmits motion from the sector 99 to store a predetermined amount of energy in the spring of the motor whereby the earns 95 to 98 will be moved. either onefifth, two-fifths or three-fifths, etc., of a revolution to correspond with each one of five circumferential openings uniformly spaced around the periphery of the sector 99. An escapement control magnet 114 at a proper time responds to current impulses established by the trailer arm 74 of the distributer E as it passes over the segments 85 and 86 at each revolution. The escapement controlled by the magnet 11 1 is arranged to permit the spring motor to step the cams 95 to 98 ahead in synchronism with the operation of the distributer E, while at the same time correspondingly stepping back or returning the sector 99 to its normal position. A tooth on one cam wheel as alined to come spond with a tooth on each one of the other wheels combines to constitute a gang of teeth whereby a complete cycle of circuit changes will take place during the time the wheels are advanced a distance of one tooth in sending a break signal. In case the cam wheels move forward a distance of two teeth the cycle of break operations will be once repeated, etc. correspond with the distance the sector 99 is moved in the manual operation of initiating a break signal and depends on which opening in its periphery was used and moved to a finger stop 105.

Let it now be assumed that a message is in process of transmission to the line 0011- ductor 89 and it transpires that a break signal should be sent to the distant station, and let it be further assumed that the signal to be sent is a single non-repeated one. Accordingly an attendant inserts a finger in the first or left-hand opening in the periphery of the sector 99 and moves the sector to the left until the finger engages thestop 105. In addition to storing energy in a spring motor to operate the cams 95 to 98 the move- Such repetitions of signals A ment of the sector 99 releases the contact member 110, which thereupon flexes to separate from the contact 111 and to close with contact 113. Disconnection of the contact 111 disconnects the winding 37 of the relay 35, and establishing of the contact 113, connects the escapement magnet 11 1 in parallel with the winding 36 of the relay 35 as serially connected with the transmitter magnet 10. After passing over the five segments 75 to 79 of the distributer E and imparting the last code-unit of message impulses to the line 89 as prepared preceding initiation of the break operation, the trailer arm 7 1 in sweeping over the segments 85 and 86 establishes the source of current 84 with tile conductor 87. At the point 115, this current divides over one path already traced. through the winding 36 of the relay 35 and the magnet 10, and another path through the contacts 110 and 113 thence through the winding of the magnet 11% to earth. The relay 30 in responding to this current establishes its contacts 39 and separates its contacts 38, thereby substituting a source of current 51 for the source 81- to lock this relay and the transmitter control magnet 10 energized. This response of the magnet 10 steps the tape 1 forward and through continuing energized retains the rack 15 to lift all of the five levers as the lever 4:, thereby permitting each one of the contacts in the group A to rest in its normal position, as shown in the drawing. A forward and re tracted movement of an armature (not shown) of the magnet 11st in phase with the trailer arm 74, passing over the segments 85 and 86 effects a two-step action of an escapement whereby a corresponding ac vance of the cam wheels 95 to 98 lifts the contact spring members '70 and S0 to disconnect the contacts 71 and 81 and to establish the contacts 7 2 and 82 respectively. Circuits thereby formed may be traced from the positively poled current bus 6 1, contacts 7 2 and 70, the bus conductor 73 to the normal contact stops 30, 31 and 33 of the group A. A second circuit extends from the negative current bus 63, contacts 82 and 80, conductor 83, contacts 101 and 100 and the conductor 103 to the normal contact 32 of the group A. A third circuit extends from the bus 73. now positive, over contacts 91 and 90 and conductor 93 to normal contact stop 34 at A. In this position a five-unit code combination formed of two positive, one negative and two positive impulses in such sequence. is established through the contacts 25 to 29 of the group A and accordingly with the five segments 75 to 79 of the distributer E. This combination of impulses on being imparted to the line conductor 89 through the trailer arm 74 sweeping over the segments '75 to 7 9 act on the distant receiver to effect a shift (or to insure that the shifted position is present) from lower to upper case cha actors. The arm 7% in thereafter passing over the contacts S5 and 86 causes the magnet 111 to ef feet a third and fourth movement of the cscapement to permit the cam wheels 95 to 98 to be advanced a second step in which position the spring members and 80 continue lifted and in addition the cam wheel 97 lifts the contact spring 90 to disconnect the contact 91 and to establish the contact 92. This switching operation connects the negatively poled current bus 03 by way of contacts 92 and 90 and conductor 93 with the normal contact stop 34- of the transmitter group A. The next or second trip of the trailer arm 74 over the segments to 79 encounters and transmits to the line 89, a code cycle comprising two positive, a negative, a positive, and a negative impulse sequence, whereby the desired break signal at the receiving station will be operated. This trip of the contactor arm 74L over the local segments 85 and works the magnet 11a to effect two movements of the escapement to permit the cam wheels to be driven forward a third step. This position of the cam wheel 97 releases its spring contactor 90 from the contact 92 to retract and establish circuit with its normal contact 91; cam wheels 95 and 96 retain the spring contacts 70 and 80, respectively. in their actuated position and cam wheel 98 moves the spring 100 to separate from the contact 101 and to engage the contact 102. Circuit changes effected by this movement of the contacts may be traced from the bus conductor 73 (included through the previously closed contacts 70 and 72 with the positive current source (32), contacts 91 and. 90, conductor 93 to the normal contact at of the group A. From the source of positive current 62. a path extends by way of contacts 59 of the relay 55, a conductor 10 1, contacts 102 and 100, and a conductor 103 to the normal contact 32 of the group A. A code combination of impulses accordingly prepared at the contacts A and held common to the segments 75 to 79 of the distributer E comprise five positive impulses which the next trip of the trailer arm 74 over the five segments will transmit to the line 89. This combination of impulses acts on the receiving equipment at the distant station to restore or unshift the printer mechanism from upper to lower case type. During this trip as the trailer arm 7% passes over the segments and 86 the magnet 11 1 is worked to effect two additional movements of the escapement whereby the cams 95 to 98 are released to move forward a fourth step. in which position all of the springs 70, 80, and 100 are brought to their respectively normal positions. The sector 99, as already mentioned, is returned step by step in connection with the forward movement of the cam wheels to 98.

Therefore, at the fourth step it reaches its normal position, thereby separating the contact 113 and establishing circuit through the contacts 110 and 111. The next trip of the trailer arm 74 releases the relay by a circuit extending from the source of current 84,

segments 85 and 86, the conductor 87, contacts 110 and 111, a conductor 116 and the winding 37 of the relay 35 to the conductor 18, to oppose the present circuit from battery 51 through the winding 36 of the relay 35, whereby neutralization of current action in the windings 36 and 37 permits this dif ferential relay to release. Separation of the contacts 39 of the relay 35 deenergizes the transmitter control magnet 10, thereby releasing the selecting movements to engage the tape 1, and establish the code cycle waiting thereon to selections at the contacts A in resuming transmission of the message at the point where it was interrupted in order to send the break signal 'just described.

Referring to the relays 55 and 65 and the contacts B, the automatic operations whereby the distant printer will be returned to the case in which it was working at the moment a break interruption took place, will now be described. Taking the already assumed code-units comprising a sequence of two positive, one negative and two positive impulses as a combination to effect shifting of the receiving mechanism from lower to upper case characters and'a sequence of five positive impulses for unshifting or returning the mechanism from upper to lower case, let it be assumed that in the regular processes of transmitting a message a shift to upper case must take place. Accordingly, at the transmitting contacts A the members 25, 26, 28 and 29 will be moved to engage their forward stops 20, 21, 23 and 24 respectively, the contact 27 remaining inert on its normal stop 32. Since the contacts in the group B operate with the respective contacts of group A, members 45, 46, 48 and 49 thereof will be shifted to respectively engage their forward contacts 40,41, 43 and 44, while the contact 47 remains on its normal stop 52, thereby establishing a circuit from a grounded source of current 53, contacts 44, 49, 43 and 48, the winding 56 of the relay 55, contacts 52, 47, 41, 46, and to earth. Operation of the relay establishes a self-locking circuit from a source of grounded current 67, the winding 57 and the contacts 58 of this relay and the contacts 66 of the relay to earth. The relay 55 also separates its contacts 59 and closes its contacts 60 to switch the conductor 104 from the current source 62 to the current source 61. Since the forward contacts 20 to 24 of the group A are energized by positively poled current, while the normal contacts 30 to 34 are normally connected to the negatively poled current source, it

will be obvious that the shift combination of impulses just traced may be transmitted from the contacts A, through the distributer E independently of the contacts B or the relays 55 and 65.

Let it be now assumed that the code combination of shift impulses has been transmitted to the distant station and that during the continuation of printing in the corresponding upper case a break signal is sent from the non-message impulse transmitting sumed to be working at the instant the break interruption took place. As already described for the third step in a cycle of break operations, at the cam wheels 95, 96 and 98 the respective contacts 70, 80 and 100 are now in their forward or actuated positions, while at the cam wheel 97 the contact 90 has been released to its normal position. As already described, the contacts 25 to 29 at A are held by the magnetlO against their respective stops 30 to 34. Therefore, while the position of the contacts at cam wheels 95 and 97 supplies positive current to the contacts 30, 31, 33 and 34, as already traced, negative current may be traced from the source 61 byway of contacts 60 of the relay 65, the conductor 104, the contacts 102 and 100 of the cam wheel 98 and the conductor 103 to the contact 32 at A. Therefore, the last trip of the trailer arm 74 in completing the break cycle will accordingly impart a code sequence of two positive, one negative and two positive impulses to the line 89, whereby the printing mechanism will be retained in the shifted or upper case position in which position, it has been assumed to have been working at the instant the break signal was initiated. Following transmission of the third set of impulses the break equipment F will be automatically restored to normal position, as already described, and automatic resumption of the message transmission and reception will, therefore be of fective in the proper type case.

Let it now be assumed that subsequent to sending of the break signal just described and during continuing transmission of the present message, a code sequence of five positive impulses is transmitted to unshift or return the distant printing mechanism to its lower case position. For the unshift operation, a combination of five positive impulses being required, the transmitter tape 1 accordingly controls the movement of each contact 25 to 29 at A to their re spective forward stops 20 to 2a, and the distributer E transmits such polarities to the distant station. In phase with the operation of the contacts 25 to 29 in the group A, contacts 45 to 19, ot the group 15 were also operated to establish a circuit :t'rom' the current source 53, contacts 45%, 19, 6L3, 418 the winding of the relay 65, contacts 12,, 17, 41, 4:0, 10 and as to earth. Operation of the relay separates its co11- tacts 6G to disconnect the winding 57 of the relay 55, thereby releasing the latter relay to switch the contact member 102 of the cam wheel 98 from the negative current source 61 to the positive source (52. The distant printer will now operate in the lower case and while the message continues under transmission let it be further assumed that a break signal is again initiated. As already described, the first and second sets of code impulses prepared for transmission by the code sender F comprise, first a sequence of fiye impulses to shift the dis tant printer mechanism to its upper case and second, fire impulses to operate the distant signal. The third set of impulse should be of such character, fire positive impulses, that the receiver equipment will be unshifted or returned to its lower case. For the third set of impulses in a break cycle, it has already been pointed out that at the cam wheels 95, 96 and 98 the respective contact members '70, and 100 are in the forward or actuated position. while at the cam wheel 97 the contact member is in its normal or retracted position. Accordingly the contacts of cam wheels and 97 include the source of positiye current 62 with the normal contact stops 30, 31, and 31 at A, as already traced, and positive current may be traced from the source 02 by way of contacts 59 of the relay 55, conductor 101-, contacts 102 and or the cam wheel 98, and a conductor 103 to the normal contact stop or the group A. The distributer E accordingly imparts such sequence of tire positive impulses to the line 89 whereby the distant printer mechanism is unshitted or returned to its lower case and sending of the message is there fore automatically resumed in the same case in which printing was progressing the instant of interruption by the break signal.

From the foregoing (.escription it will be clear that the contacts B control the relays and 65 to store up or prepare and continue or discontinue circuit changes to predeterminedly affect shift or unshitt impulses as prepared for transmission by the code signal sending device F and that, due

65 to such control, the transmission and recomposing of a message into a printed record will, following a break signal, always resume in the same case in which it was progressing at the time it was interrupted in the sending of a break signal.

hat is claimed is:

1. I11 a telegraph system, a line circuit, a station provided with a first transmitter and an auxiliary transmitter, means controlled by said auxiliary transmitter to disable said first transmitter, and electroresponsive means controlled by said first transmitter to store circuit changes to predeterminedly affect the operation of said auxiliary transmitter.

2. In a telegraph system, a line circuit, a station provided with a first and an auxiliary means for transmitting impulses, and storing means controlled by said first transmitting means to establish circuit changes for controlling predetermined ones of the impulses transmitted by said auxiliary transmitting means.

In a telegraph system, means at a sending station to transmit message impulses, auxiliary means at said sending station to transmit non-message impulses, elec troresponsive storing means controlled by said message transmitting means, and means controlled by said storing means to predeterminedly at'fect impulses transmitted by said non-message transmitting means.

a. In a telegraph system, a line circuit, a first transmitter and a second transmitter for said line circuit, means for operatiyely substituting said second transmit er torsaid first transmitter, storing means responsive to said first transmitter to predeterminedly affect the operation of said second trans mitter and electroresponsive means controlled by said first transmitter to disable said storing means.

5. In a telegraph transmitting system, a line circuit, a first group 01 contacts i11- cluded with said line circuit, a second group or" contacts, means for selectively operating said first and second groups of contacts in the transmission of impulses to said line, electroresponsive means controlled by said second group of contacts for storing circuit changes, a third group of contacts, means controlled by said third group of contacts to disable the operating means of said first and second groups of contacts, and means for operating said third group of contacts to transmit to said line impulses modified by said stored circuit changes.

6. In a telegraph transmitting system, a line circuit, means for transmitting message signals to said line circuit, means for transmitting break signals to said line circuit, and electroresponsive circuit controlling means controlled by said means for transmitting message signals to store changes of circuit to predeterminedly afi'ect signals transmitted by said break signal transmits ting means.

7. In a telegraph system, a line circuit, a first transmitting means, a second transmitting means included with said line circuit and said first transmitting means, means controlled by said first transmitting means for operatively controlling said second transmitting means, and electroresponsive means controlled by said second transmitting means for storing changes of circuit between said first and said second transmitting means, and circuit controlling means operated by said first transmitting means for establishing said stored changes of circuit effective with respect to impulses trans mitted through said second transmitting means to said line circuit.

8. In a printing telegraph system, a line circuit, transmitting means for imparting character selecting impulses and case selecting impulses to said line circuit, transmitting means for imparting signal operating impulses to said line circuit, electroresponsiv'e means controlled by said first mentioned transmitting means for storing said case selecting impulses, and means controlled by said signal transmitting means to impart 10. I11 a printing telegraph system, a line circuit, a distributer for imparting current nnpulses to sald line, a first transmitter for establishing message nnpulses mcludmg shift and unshift impulses with said distributer, a second transmitter for establishing signal control impulses and shift and unshift control impulses with said distributer, electroresponsive means controlled by said first transmitter to store shift and unshift impulses, and means controlled by said second transmitter to render stored shift and unshift impulses effective with said distributer.

11. In a signaling device, means for automatically impressing combinations of selecting impulses on a line, additional means for impressing combinations of signaling impulses upon said line, and means responsive upon the impressing of a particular combination of selecting impulses for modifying the normal operation of said additional means.

12. In a signaling device, means for automatically impressing combinations of selecting impulses upon a line, said means in- :luding a plurality of tape-controlled fingers, and a plurality of switching members adapted to be included in said line'by said fingers, additional means including said switching members for impressing combinations of signaling impulses on said line, and means controlled in the operation of said fingers for modifying the normal operation of said additional means.

13. his signaling device, means for automatically impressing combinations of selecting impulses on a line, said means including a plurality of tape-controlled fingers and a plurality of switches adapted to be included in said line by said fingers, additional means for impressing combinations of signaling impulses on said line, additional switches operated from said fingers, a circuit closed by said additional switches when operated in a certain combination, and means included in said circuit formodifying the normal operation of said additional means.

In witness whereof I hereunto subscribe my name this 2d day of Au ust, A. D. 1917.

'PAUIFM. RAINEY.

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