US1560704A - Printing telegraphy - Google Patents

Description

6. A. LOCKE PRINTING TELEGRAPHY I Nov. 10, 1925- 2 sheets-sheet 1 Filed Feb. 1, 1922 //1ve/7 /0/'.' George A. Lac/re I Nov 10,1925

G. A. LOCKE PRINTING TELEGRAPH! 'Filed Feb. 1, 1922 2 Sheets-Sheet 2 Q 5 M g g Ge rye A to /re.

Patented Nov. 10, 1925.

UNITED STATES PATENT ormcu.

GEORGE A. LOCKED]? MASPETH, NEW YORK, ASSIGNOR TO WESTERN ELECTRIC COM- 'PANY, INCORPORATED, OF NEW .YORK, N. 'Y., A CORPORATION OF NEW YORK.

PRINTING TELEGBAPHY.

Application filed February 1, 1922. Serial No. 533,271

To all whom it may concern: Be it known that I, Gnonou A. LooKE, a citizen of the United States, residing. at Maspeth, in the county of Queens, State of New York, have invented certain new and useful Improvements in Printing Telegraphy, of which the following is a full,

clear, concise, and exact description.

This invention relates to telegraph systems.

An object of the invention is to provide a system whereby a plurality of telegraph messages originating at separate stations may be transmitted over a plurality of branch lines or extension circuits to main or central stations, where synchronous multiplex apparatus is located for automatically and simu taneously transferring the code combinations of message impulses to a line connecting the central stations.

Another object is the provision of means ..associated with the synchronous multiplex apparatus at the central stations for providing a complete overlap between the selections received from the synchronous multiplex apparatus and those transmitted to the extension circuits or branch lines.

The invention provides synchronous multiplex and start-stop apparatus at the central stations with means associated therewith such'as a plurality of groups of relays, one

\ group of which is designed to remain energized until deenergized due to the receipt oi a succeeding selection which accordingly changes the polarity of the selecting impulse for providing a complete overlap between the selections received from the synchronous multiplex apparatus and those transmitted by the start-stop apparatus to the extension circuit. I I

.The .inventioii'is illustrated in the accompanying drawing which represents one embodiment of the invention and when arranged so that Fig. 1 is to the left of Fig. 2

a complete system is shown diagrammati-' main station B by a line 7 equipped with duplex apparatus and a distant branch otfice D which, like branch oflice A, is connected with the associated central station C by an extension circuit 8.

At the branch office A there are located transmitting and receiving equipments E and F respectively, being shown diagrammatically. .Theextension circuit 6 may be a pair of line conductors or a single line conductor equipped with duplexapparatus, "as illustrated in the drawings. Both of the central "stations B and-C are provided with receiving distributors G and H of the startstop type to receive the code combinations of message impulses from the respective substations or the branch otlices and transfer them to the multiplex synchronous distributors I and L also located at the oflices B and C respectively, through the instrumentalities of a series of condensers and a plurality of groups of storing relays. Also located at the central offices are the synchronous distributors K and M, each of which serves to\receive the signaling impulses from the line conductor 7 connecting these two stations and to transfer the same to the start-stop distributors N and R respectively, through the instrumentalities of a plurality of groups of relays which, accordmg to the present invention, provide a complete overlap between the selections received on the synchronous .multiplex distributors and those transmitted tothe extension circuits by the start-stop distributors associated therewith. Branch oflice D, like branch office A, is provided with a transmitting distributor P and a receiving distributor Q, which serve their respective purposes. For the 90 sake of clarifying and simplifying the draw: ings,. the a paratus' common to one channel has been shown in detail, while that individual to the other channel has been shown :brushes 12 and 13 arranged to make contact with rings-14; 15, 16 and 17. The outer ring 17 is divided into a plurality of segments 18, 19, 20, 21, 22 and 23, wh ch are are connected to the respective segments forming the outer ring 17 of the distributor 10. Also arranged in the transmitter 24'is a common contact 35 which,- as previously stated, controls the energi-zati'on of the start relay28. Although'the transmitter 24 has been shown diagrammatically as a keyboard transmitter, any well-known type of trans mitter may be substituted therefor which will provide equally good results.

At the central otlice B there is shown a receiving distributor G of the start-stop type anda synchronously operated distributor ,I which has its continuous ring 95 connected .to the apex of the ratio arms which includes 25 the receiving relay 99 forming a part of the duplex equipment associated with the line conductor 7. The line relay 99 responds only/ to incoming impulses and is nonrresponsive to outgoing impulses. Upon the operations '30 of the multiplex distributor I, thisrelay will not respond to impulses which may be trans: ferrd thereto from the start-stop distribu: tor

The start-stop distributor'G comprises an outer ring 44 and an inner ring 40. Forming a part of the outer ring is a-plurality of 4 segments 47, 48, 49, 50, 51', 52 and 53, the

first five of which correspond to respective ones of the segments on thetransmit't'ing distributor 10.. the proper orientation of these segments and inasmuch as they are smaller than the transmitting segments of the transmitting distributor 10, the central portion of the signal impulse transmitted over the extension circuit 6 to the line relay 37 will be piclted up for'each'segment ofthesending face at the branch ofiice A. Thedis-' 'tributor G also comprises a brush arm 41' carrying brush 42 which is held again-st rorelease magnet 39. I

. Interposed between the start-stop 'distrib tation by a release latch underthe control of utor G and the multiplex. or synchronously operated distributor I, are a set'of condensers in combination with a. single group of storing relays operable in accordance with the signals transmitted and controlled by a series of transfer relays under the control of both the start-stop. distributor Gand the multiplex distributor I. The' set of condensers and the single group of storing relays serve to provide a complete overlap between the selections received-from the start stop distributor G- and those transmitted out over the line 7 bythe multiplex distributor I irrespective of what the phase relation is between the brush arm of the multiplex distributor I and the brush arm of distributor G, providing, of course, that the speed of the brush arm of the start-stop distributor equal to or slightly less than that of the brush arm of the multiplex distributor I. The condensers 56, 57, 58, 59 and 60. are connected directly to the receiving segments forming the outer ring of the distributor G and will be charged in accordance with the operation of relay 38. During certain periods of operation however, the impulses received on the segments 47 to 51 inclusive, will be transferred directly through the armatures and contacts of the transfer relays 70, 71 and 72 to the right-hand windings of the set of storing relays'76 to inclusive, as will be more .clearly. described hereinafter. The energization of the transfer relays 70, 71

- and 72 is controlled jointly by the start-stopdistributor G and the multiplex distributor 1, so that no mutilation or piling up of the signaling impulses -will result should one distributor be slightly out of base with respect to that of the other. IFpon the energization ofthestoring relays-76m '80 inclu' sive, a locking circuit is established therefor which is under th eieontrol of the multiplex distributor I and which will bere'lease'donce per revolution thereof. ,After asetof im pulses have been transmitted from the distributor G to the condensers 56 to 60 "and upon the release of the transfer relays 7 0', 71 and 72, a discharge'circuit isestablis'hed for these condensers extending through the right-hand winding. of the corresponding ones of the-storing relays 76 to 'u80'which thereupon attract their armatures and establish-a locking circuit therefor.' These relays will be locked up through their own con tacts and left-hand windings, thus'after their initial energization. are maintained 'en-' 'e'rgized independent of the condensers- 56 to' "60, i It is through the contacts of therelays 76 to. 80 that the polarity of the impulses corresponding to the various characters is varied. i v

In order that the impulses will belytransferred from the respective parts of the circuit so that no mutilation of signals will-result, such transfer is under the joint control of the start-stop distributor G and the "synchronousmultiplex distributor I as will be more-clearlydescribed hereinafter. j

' he apparatus just described constitutes the equipment located at the central or main 4 station'B and which serves to transmit im-- "pulses from the branch otfice A to the line -comiuctor 7 and thenceto the centralofiice (J from whence the message impulses are transmitted to the distant branch oflice D.

a The apparatus at the central oflice C.

central oflice B comprises a multiplex. distributor M and a distributor of the startstop type R. The multiplex distributor M comprises, among other parts, a continuous ring 113 and an outer ring which is divided into a plurality of segments 107, 108, 109, 111 and 112. Like the distributor I a continuously revolving brush arm 102 carrying brushes 103 and 104 is provided. Connected to the smaller segments forming a part of the outer ring are the windings of a. set of storing relays 115, 118, 121, 124 and 127 which serve in combination with the other two sets of storing relays 114, 117, 120, 123, 126 and 116, 119, 122, 125 and 128 to provide a complete overlap between the selections transmitted from the multiplex distributor M and those transmitted over the extension circuit 8 by the start-stop distributor R.

The start-stop distributor R comprises an outer ring divided into a plurality of smaller segments .132, 133, 134, 135, 136 and 137. The first five of these segments are connected to the right-hand armatures of the storing relays 115, 118, 121, 124 and 127 which, upon their energization, are locked whereby the armatures thereof remain in the position set until due to a subsequent selection they are released for transmitting an effect opposite to that when they were energized. For bridging the outer ring of the distributor R, with the inner rin 138, the distributor has a brush 130 carrie by a brush arm 129 which is normally held against rotation by a latch under the control of a release magnet 131. The release magnet 131 is controlled through contacts on the relays 114, 11'2", 120, 123 and 126 so that upon the energization of any one of these relays an energizing circuit-for release magnet 131 is established for causing the release of the brush arm 129. v

The receiving equipment Q at the branch office D comprises a receiving printer diagrammatically shown at 155 which com- .p'rises the usualselecting magnets 156, 157,

158, 159 and 160 and the printing magnet 168. The respective magnets have their windings connected to the segments 161, 162, 163, 164 and 165 forming a part of the outer ring of the receiving distributor. The distributor like the distributor G has a brush arm 147 carrying a brush 148 which is arranged to., bridge the segments forming a part of the outer ring with the segments 154, 166 and 152 for controlling the energiz ation of the respective ones of the selecting magnets depending upon the energization of relay 151 which, in turn, is controlled by the line relay 146 connected to the extension circuit 8. Inasmuch as the apparatus associated with the other channel of the system is identical with the equipment .just described, further description thereof is considered unnecessa'ry here. However, the rectangles designated by the characters S and T represent the equipment intermediate the distributors G and I and M and B respectively, which as "to communicate with the branch ofiice D, in

which case the transmitter 24 will be operated to set up a particular combination depending upon the message desired to be transmitted. Let it also be assumed that it is desired to transmit a character in which contacts 30, 32 and 34 of the transmitter 24 are actuated for closing their respective contacts.

As previously described, upon the operaclosed for causing the energization of the start relay 28, the energizing circuit of which extends from battery through the lefthand winding thereof, contact 35, segment 15, brush 13 and the segment 14 of the trans- 'tion of the transmitter 24, contact 35 will be I mitting distributor 10 to ground. The start relay 28 is thereupon energized and is locked up over a circuit under the control of brush 13. Upon the energization of start relay 28 an energizing circuit is established for re lease magnet 27, which, in operating. withdraws the release latchunder its control from engagement with the brush arm 11, which is thereupon free to rotate whereupon the brush 12- consecutively completes circuits extending from the segments 18, 19, 20, 21 and 22 and the contacts of the transmitter 24 which have been operated through the winding of the pole changing relay 29. The pole changing relay '29 is energized upon the passage of the brush 12 over the segment to which one of the closed contacts of the transmitter 24 is connected for applying tothe line 6 an impulse of a polarity corresponding to that normally applied thereto. The instant the brush 12 passes ofi' segment 23- an open circuit condition is established whereby the pole changing relay 29 reverses the position of its armature and connects the positive source of current with the apex of the ratio arms to which'the receiving' relay 361s connected, but which does not respond to outgoing impulses. Relay 37, located at the central oflice B does however, respond to such change in polarity and reverses the position of its armature whereby the energizing circuit of relay 38 is broken, consequently an energizing circuit for the release magnet 39 of the distributor G is established extending from battery through the winding of release magnet 39, segment 53, brush 42, segment 54 of the distributor G and the winding of relay 61 to ground.f

Relay 61 in attracting its armature causes a momentary char 'ng of the condenser 67 which is norma y short-circuited by the high resistance 68, through the left-hand winding of relay 62. Relay 62 thereupon attracts its armatures which conditions an energizing circuit for relay 63 but which is not completed until the bridging of the segments 52 and 46 by the brush 42. At the .righthand armature and contact of this relay, an energizing circuit-is established for the transfer relays 70, 71 and 72 extending from battery through the right-hand wind- ,ing of relay 62, armature and contact thereof, windings of relays 72, 7l1 ai1d 7 O in series and the right-hand armatu e .and contact of relay 66 to ground. Relay 62 is locked up over the circuit just traced and is maintained energized until the energization of relay 66.

The relase magnet 39 being energized, the brush arm 41 is thereby released for rota-- tion. Owing to the withdrawal of the release latch under its control and contact 30 of the transmitter- 24 being closed an energizing circuit for the pole changing relay 29 is es' 24 being-open, the pole changingflay 29 is caused to reverse the position of its armature upon the passage of the brush 12 over the segment 19 to which contact 31 of the transmitter is'connected. Similarly the receiving relay 37 at office B reverses the'position of its armature and consequently-causes the deenergization of relay 38. Thus, upon the passage of the brush 42 over segment 48 of the distributor G, the condenser 57 will not be charged. Contacts 32 and 34 of the transmitter 24 being closed, conditions-similar to those described in connection'with contact 30 will be established for causing the charging ofcondensers 58 and '60 in accordance with the energization of relay 38, upon the passage of the brush 42 over the segments to which these condensers are connected, Condenser 59 will however, not be charged owing to contact '33 of the transmitter24 being open so that an open circuit. condition is establlshed upon the passage of.

the brush 42 over the segment individual thereto.

Just prior to the completion of the cycle of rotation of the brush arm 41. an energizing circuit is established for relay 63 extending from battery through the armature and contact of relay 64, winding of relay 63, front contact of relay 62, segment 52, brush 42 and se ment 46 of the distributor G to ground. Tielay 63, is thereupon energized 7 and locked up and establishes at its lefthand contact a short circuit for the condenser 67, otherwise, no effect is produced due to the energization of this relay.

The brush 88 of.the multiplex distributor I in passing over segment 96 completes an energizing circuit for relay 65 extending from battery through ring 98,- brush 88, segment 96 of the distributor I, contact 69 on the relay 66- and the winding of relay 65 to ground. Relay 65 in closing its left-hand contact opens the locking circuit of the relays 76 to'80 inclusive, thereby restoring any one of these relays which have previously been energized to normal and also establishes an auxiliary locking circuit for relay 62 for preventing the release of this relay. Upon the closure of the right-hand contact of relay 65 an energizing circuit for relay 66 is established extending from battery through the ring 98, brush 88, segment 96, righthand contact and armature of relay 65 and the Winding of relay 66 to ground. Relay 7 66 in energizing opens the original energizing circuitof relay 65 which thereupon releases its armature and again conditions the locking circuit of the storing relays 76 to 80 inclusive, while at the right-hand armature the locking circuit of relay 62 is broken thereby causing the deenergization of this relay and conse uently the deenergization of transfer relays 0, 71 and 72. Upon the release of the transfer relays. 7 0, 71 and 72, a discharge cincuit is established. for the .condensers 56, 58- and-60 through the-arm'atures and contacts of the transfer relays 70, 71

and 72 to the right-hand winding of the storing relays 76,78 and 80. These relays. will bethus energized and locked upover a circuit from battery through the left hand start-stop distributor G and multiplex dis- 1 tributor I respectively, arepracticall'y coincident, that is, they have the same phase rearmature and winding thereof and the left- -hand normal contact of relay 65 to ground lation or the brush arm 41 is about to engage the segments 53 and 54 at the time the brush 88 is passing over segment 96, relay62 is prevented-from deenergizing upon the operation of relays and 66, as previously described, for transferring the impulses stored in the condensers 56 to 60 inclusive, due to the energizaton of relay 63. Upon the engagement of the brush 42 with the segments 53 and 54, and due to the energization of relay 61, a sustained impulse will traversethe left-hand winding of relay 62 which will provision of such an arrangement the con.-

trol of the transfer is now such that the imulses stored in the condensers 56to 60 will transferred to the storing relays 76 to 80 at the proper tim During a certain cycle of operation of the disg'ibutorsthe brush 88 will pass over segment 96 at a advance of the passage of the brus 42 over segments 52 and 46 of the distributor G in which case the relay 62 will have been deenergized and accordingly the transfer relays 70, 71 and72 will be deenergized for transferring the impulses stored in the condensers 56 to '60 to the storing relays 76 to 80 inclusive. However, upon the passage of the brush 42 over segments 52 and 46, an energizing circuit is established for relay 64 which, as previously described,- controls the locking circuit of relay 63; The energizing circuit for re..a 64 extends from battery through the win ing thereof, left-hand normal contact and armature of relay 62, segment 52, brush 42 and segment 46of the distributor G to ground. Relay 64 in energizing merely opens the locking circuit for relay 63 which is then restored to normal for removing the short'circuit from about' the condenser 67. Thus, upon the engagement of the brush 42 with the segments 53 and 54 conditions similar to that describedfor the initial operation of the system will be brought about, that is, the condenser 67. will be charged and a momentary surge of current through the winding of relay 62 produced for causing the energization and locking of this relay. Upon the passage of the brush 89 of the multiplex distributor I w Upon the passage of the brush 89 overeriod in segment 94 to which the armature of storing relay 76 is connected, an impulse of positive polarity will be transmitted-to the central station C which passes through'the windings I of the receiving relay 101 for causing the reversal of its armature. The negative pole of the battery associated with. the contacts of this relay is thereupon connected with ring 113 of the distributor M so that upon the passage of the brush 104 over the segment to which the storing'relay 115 is connected this relay will be energized over a circuit'extending from battery, upper contact and armature of receiving relay 101, ring 113, brush 104, segment 107, righthand armature and normal contact of relay 114, winding of relay 115 to ground. Relay 115 in closing its left-hand contact establishes an energizing circuit for itself extending from battery through the left-hand armature and contact of relay 116, winding of relay 114, left-hand armature and contact and the winding of relay 115, to ground.

Relay 114 being energized upon the estabtion of relay 115,. It is thus seen that-the relay 115 will remain in the position set until the reception of a subsequent selecting unit differing in polarity from the one which previously caused the energization of this relay. As the brush arm 87 continues 7 to rotate, conditions depending upon the position of the armatures of the storing relays 76 to 80 inclusive, will be set up for causing the corresponding positioning of the armature of receiving relay 101 at the central olfice C. Thus upon the passage of the brush 104 over the segments to which the storin relays 118, 121, 124 andaI'127-are' norma ly connected, theserelays wil-l'b'ej'env ergized depending upon the energization of the storing relays of the second set located at the central oflice B.- For the particular selection chosen, storing relays 121 and 127 will be energized over circuits similar to that traced in connection with storing relay 115.' The energized ones of these storing relays will also be locked up through contacts in,a manner similar to that described in connection with the storing relay 115. Upon the passage of the brush 104 over the segment to which the storin "relays 118 and 124 are connected these re ays will not be energized owing to the position of the arma ture of relay 101. However, had these re lays been previously energized, an energizing circuit would be estab shed for the re-- lay 66' and the opening of the locking circuit of the storing relays 76 to 80 inclusive, which had been previously energized. Similarly, relay 66 in opening its right-hand contact causes the deenergization of the transfer relays 70, 71 and 72 for transferring the impulses stored in the condensers 56 to 60 in accordance with the next selection to the storing relays 76 to 80.

Following the passage of the brush 104 of the multiplex distributor M over segment 112, brush 103 bridges segment 105 with ring 106, whereupon an energizing circuit is established for the release magnet 131 of the start-stop distributor B. This circuit extends from battery through the winding of the release magnet 131, conductor 139, segment 105, brush 103 and rin 106 to ground. Release magnet 131 upon eing energized withdraws its release latch from engagement with the brush arm 129 thereby permitting the rotation thereof. The brush 130 carried by the brush arm 129 consecutively connects the segments 132, 133, 134, 135 and 136, which are connected with respective armatures of the storing relays 115, 118, 121, 124 and 127 in circuit with the winding of the pole changing relay 142. Prior to the engagement of the brush 130 with the segment 132 and upon the passage of this brush off segment 137, pole changing relay 142 is deenergized thereby impressing on the extension circuit 8 an impulse of a positive polarity-which, upon being received at the branch oi'rice D, causes the reversal of the armature of the receiving relay 146. Relay 146 in reversingjhe position of its armatuierauses the deenergization of relay 151 which, in turn, closes through its back contact an energizing circuit for the release magnet 150 of the receiving distributor, thus releasing the brush arm 147 for rotation. a 1

Upon the passage of the brush 130 over segment 132, and owing to the fact that the storing relay 115 is energized, an energizing circuit is established for the pole changing f D to the ring 1 138, brush 130, segment 132,0 the distrib-" relay 142 extending from batte utor R, right-hand armature and contactof storing relay 114 and the-winding of the pole changing relay 142to ground. The

closure of such a circuit causes the energization of the pole changing relay 1 42, which impresses on the extension circuit 8 an impulse of a negative polarity for causing the reversal of the position of the armature of the receiving relay 146 to the position shown in the drawing, consequently causin the energization of relay 151. Relay 151 now energized upon the passage of the brush 148 over segment 161, selecting magnet 156 connected to this segment Will be energized over a circuit extending from battery through the Winding of this magnet, segment 161. brush 148, ring 154 and the alt-ernate contact and armature of relay 151 'to ground. The movement of the selecting bar under the control of this magnet will be effected at this time.

The brush 130 in passing over segment 133 and inasmuch as storing relay 118 is not energized causes the pole changing relay 142 to reverse the position of its armature and impresses on the extension circuit 8 an. impulse of a positive polarity. Similarly, upon the passage of the brush 148 over segment 162 to which the selecting magnet 157 is connected, an open circuit. condition is established owing to the fact that the receiv ing relayv146 has reversed the position of its armature and, in turn, caused the deenergization of relay 15]. Conditions similar to those just described for selecting magnet 156 will be establishedupon the passage of eing the brush 148 over segments 163 and 165 respectively, for causing the energization of the corresponding selecting magnets 158 anu 160 of the receiving printer 155. However. since the storing relav 124 is not energized on the selecting magnet 159 upon the passage of the brush 148 over segment 164 to which this selecting magnet is connected.

Following the passage of the brush 148 -for this selection, no effect will be produced on segment 165 and the passage thereof over segments 166 and 167 a circuit is completed extending from battery through the winding of printing magnet 168, segment 167, brush 148 and segment 166 to ground.

Thus, the signals transmitted from the branch off ce A will berecorded on the receiving printer 155. at the branch 'ofiice D over one channel of-the line conductor equipped for duplex operation.

Although the invention has been illus- ,trated in connection with a system wherein De readil applied to'other types of systems without eparting from the spirit and scope of the present invention.

What is claimed is: 1

1. In combination, a line, a distributing mechanism for distributing selecting units to said line, and electromagnetic means operatively energized operated in response to said selecting units and retained energized until the receipt of selecting units differing in character from those that caused initial operation thereof.

2. In combination, a main line, anextension circuit, distributing mechanism for distributing code combinations of message impulses received from the main line to the extension circuit, and a plurality of groups of electromagnetic devices associated with said distributing mechanism for storing simultaneously records of successive code combinationstolprovide a complete overlap between the selectionsreceived from the main line and those transmitted to the extension circuit.

3. In a signaling system, receiving and transmitting distributor mechanisms, signal storing means comprising a plurality of groups of electromagnetic devices intermediate such. mechanisms for storing simultaneously records of successive code combinations of message impulses to provide a complete overlap between the selections received by the receiving distributor mechanism and those transmitted by the transmitting distributor mechanism.

.4. In combination, a main line, anextension circuit, distributing mechanism'for distributing code combinations of message impulses from the main line to the-extension circuit, a plurality of groups of electromagnetic devices-associated with said distributing mechanism for storing simultaneously, records of successive code combinations to rovide a complete overlap between the seections received from the main line and those transmitted to the extension circuit, one of said groups of devices being-retained operated until released due tov the receipt of a selection of a character opposite to that i which previously caused their operation. 5

a '5. In a printing telegraph system, a main line, a synchronous multiplex distributor associated with said main line, an extension circuit, a start-stop distributor connected thereto, a group of storin relays associated with said distributors an energized in accordance with the selections received by said multi lex distributor, and means controlled by said group of relays for retaining said rela-ys energized until a change in the char= actor of the selections is received.

6. In a printing telegraph system, a main line, a synchronous multiplex distributor as sociated with said main line, an extension. circuit, a start-stop distributor connected thereto, a group of storin relays associated with said distributors and energized in accordance with the selections received by said multiplex distributor, and a relay individual to each of the storingirelays energized upon the operation thereof for maintaining the storing relay individual thereto energized so long as selections of the same character are being received from the main line.

7. In a printing telegraph system, a main 76 line, a synchronous multiplex distributor associated with said main line, an extension circuit, a start stop distributor connected thereto, a grou of storing relays associated with said distributors and energized in ac- 80 cordance with the selections received by said multiplex distributor, a relay individual to each of the storing relays and energized uponthe operation thereof for maintaining the storing relay individual thereto energized independent of signals on the main line, and means conditioned for o ration upon the operation of the relay in ividual to the storing relay and subsequently operated due to the receipt of a selecting unit for causing the release of the storing relay individual thereto.

In witness whereof, I hereunto subscribe my name this 24th day of January A. D., 1922.

GEORGE A. LOCKE.

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