US1479845A - Printing-telegraph system - Google Patents

Description

Jan. 8 1924.

G. S. VERNAM PRINTING TELEGRAPH SYSTEM Filed June 10 1918 6 Sheets-Sheet 1 a IN VEN TOR. (I. 6. V6! nwm/ A TroNgY Jan. 8 1924. 1,479,845

G. 5. VERNAM PRINTING TELEGRAPH SYSTEM 6 Sheets-Sheet 2 Filed June 10 1918 INVENTOR. G.%*rnam BY f. fr

ATTORNEY Jan. 8 1924- s. s. VERNAM PRINTING TELEGRAPH SYSTEM Filed June 10, 1918 6 Sheets-Sheet 5 INVENTOR. G. (51 Var/2am BY 3. 2". M,

A TTORNEY Jan. 8 1924 1,479,845

a. s. VERNAM PRINTING TELEGRAPH SYSTEM Filed 'June 10 1918 6 Sheets-Sheet f N VEN TOR.

' ATTORNEY G. (5. Vlllafil Jan. 8 1924.

G. 5. VERNAM ram'rma TELEGRAPH SYSTEM Filed June 10, 191B 6 Sheets-Sheet 5 INVENTOR. 6.8. Vagzam BY 51. 2 7 3 A TTORNEY Jan. 8', 1924. 1,479,845

G. S. VERNAM PRINTING TELEGRAPH SYSTEM Filed Juhe 10, 1918 e Sheets-Sheet e INVENTOR. 1. 45. I ernam E. {55%,

ATTORNEY operation.

Patented Jan. 8, 1924.

UNITED STATES 1,479,845 PATENT OFFICE.

GILBERT S. VERNAM, 0F BROOKLYN. NEW YORK, ASSIGNOR TO AMERICAN TELE- PHONE AND TELEGRAPH COMI'ANY, A CORPORATION OF NEW YORK.

PRINTING-TELEGRAPH SYSTEM.

Application filed June 10, 1918. Serial No. 239,257.

To all whom it may concern Be it known that I. GILBERT S. VERNAM, residing at Brooklyn, in the county of Kings and State of New York. have invented certain Improvements in Printing-Telegraph Systems, of which the followingis a specification.

This invention relates to printing telegraphy, and more particulary to printing telegraph systems employing a distributor for distributing outgoing impulses to the line in predetermined and definite order, and for distributing succcssivcl' received impulses to selective printing meciani'sm in the order received. In its more specific aspects the invention relates to a system in which in stead of continuously operating synchro' nizcd distrilmtors at the sending and receiving stations. a distributor is provided at each station. whose bperation is inter; mittent, i. e., each istributor is started at each station, coinpletes one operation, and then stops preparatory to executing another cycle of operations, the starting and stopping of the distributors securing the same result as the synchronizing of the usual continuously operating distributors.

The invention has for one of its'objects the provision of means whereby the time utilized for each cycle of operations may' be reduced,-thereby increasing the speed of Another object of the invention'has reference to the provision of means whereby, instead of employing both a starting and a stopping impulse in addition to the usual code. impulses,' but a single impulse in addition to the code impulses will be r uired.

A further object of the invention has ref erence to means whereby one of the impulses which would normally hoof longer duration than the others may be shortened in order to compensate for the, time during which the distributor is atrest between operations. V

A further object of theinvention relates to the provision of arrangements whereby the first or starting impulse of each series of impulses will always be different in charcode impulse, 1

acter from. the last precedi-n thereby insuring that the distributor will only be set in operation when such a change in the character of the impulse takes'place.

Another object of the invention has reference tothe provision of means whereby ting of the setting upof a second code group while the first code group is being transmitted.

Another object of the invention has reference to the provision of means whereby it. the sending key or other code forming mechanism be held operated for a period longer than that necessary to transmit the code group so formed, said code group will not be repeated.

Still another object of the invention has reference to the provision of means at the receiving station whereby one or more of the first impulses of a. code group may be stored up until the printing operation resulting fromthe reception of a preceding code group has been completed.

Other and further objects of the invention will appear in connection with the detailed description to be hereinafter given. In the systems heretofore known employing a rotary distributor whose rotation is intermittent, it has been customary to send a startingimpulse to set the distributor into motion, then send the code impulses making up a group corresponding to a given character, and finally send a stopping impulse to restore the; apparatus to normal and prepare it for the succeeding group of impulses. Thus. with a Baudot code of five impulses to determine the character to be printed, it would be necessary to transmit seven impulses for each character. The time necessary to transmit these impulses would be further increased by the period during which the distributor is at rest between successive rotations so that altogether a time period equal to about seven and one half impulses would be necessary for; the transmission of each character.

that the first or starting impulse. of each group will be opposite to or different in character from the last impulse in the pre ceding set. In order to still further reduce the time period, the last impulse. which would normally be longer than the others, because of the perior of rest between rotations, may be somewhat shortened in ac cordance with this invention, by making the corresponding segment of the sending dis tributor shorter than the others thereby compensating for the period of rest.

In order to permit of setting up a new combination upon the tape transmitter, controlling, key or other means used to set up the code group for each character he'fore the transmission of the preceding group has been completed, arrangemen s are provided whereby the code group set up will be stored by means of a of relays which will then control the transmission of the code group, whilcthe code formirurmeaus may be restored. This gives more time, to advance the tape because of the overlap in the time periods and permits 'of correspondingly more rapid operation oi a keyboard transnutter. Means are also irov-i led so that if a licy is held operated or a period longer than that necessary to transmit the corre- SIHIHIllH L' group of impulses. the distrihutor will not he caused to rotate a second time and repeat li e previous character. In connection with thoreceiving end, aftcrvlhc last impulseof agjroup has been received a certain length of time is nccessaryto complete the printing operations. In order to eliminate this time period from the total time period necessary for the reception and printing of each chara ter, the apparatus is so arranged that one or more of the first impulses of each code group is stored up and hold inefiective until sullicienl time has been given for operations connected. with the printing of the preceding character, so that the selectiz'ig and printing operations overlap each other.

The invention may now be more fully derstood by reference to the following do scription taken in connection with the accompanying drawings,Figurcs l. 2 and 3 of which respectively illustrate three different forms of transmitting arrangements enihodying the present invention, while F i rures 4, 5 and 6 respectively illustrate three onus of receiving arrangements embodying the invention. It will he understood, of course, that any one of the three forms of receiving arrangements illustrated may be used in connection with any one of the three forms of transmitting arrai'igements shown.

Referring now toFigures 1 and 4, which, when placed .end to end, constitute. a circuit diagram of one form of the invention arranged for duplex operation, two stations A and B are shown interconnected by a line L terminating at each end in the usual duplex arrangement. At Station A only the details of the transmitting apparatus are shown, while at station B only the details of the re eeiving apparatus are shown. The transmitting apparatus com rises a rotary disthe usual Baudot code. and the other of which corresponds to a starting impulse.

The fifth segment of the five segments corresponding to the impulses of the code, is made somewhat smaller than the other segments in order to compensate for the increased length of the impulse sent from said segment due to the fact that the arm 11 remains at rest, upon said contact for a brief period between sucessive revolutions, as will morefully appear hereafter.

The rotatingaim 11 is normally held sta tiona'ry by means of a releasing device 12 under the control of a starting magnet 13,

and upon the energization of the. latter, the

releasing; device 12 is tripped, permitting the arm ll to rotate over the successive 'scgmeutsot the distributon until it returns to its normal: position. when it again on- ;i'ages the releasing; device 12, the magnet 13 having inilthe meantime been deenergized. A pole changer F4} is provided which sends out to' the line L successive positiveor negative lll'lIlUl-HPS as the arm 11 rotates over the segments of thc,distributor.

In order to control the formation of the sets or groups of code impulses correspond ing tothe various characters to be printed, a tape transmitter 'l is provided, said transloo mitter comprising five sets (if-contacts which normally rest upon an idle bus-liar 15, but which are adapted, a perforated ta passes over suitable controlling means, to 2 shifted into contact with a bus-bar 16, so that circuits are completed corresponding to the'perforations in the tape. The tape is advanced by means of a magnet 17 in a wellhnown manner. y

An alternative means for setting up the groups of impulses corresponding to the characters is provided, said means comprising a key-controlled transmitter K consisting of five contacts normally resting against an idle bus-har-lS, but adapted to be moved into contact with the b ns-bar 19 in various combinations, depending upon the key dc ressed.

and form no part of the p esent invention, they need not he further escribed.

In order to shift the control of the send- 1ng,apparatus from the tape transmitter T to thpgkeyboard transmitter K, a gang As the details of these code formmg mechanisms are well-known in the art contacts. Five of these sets of contacts control circuits leading to storing relays 20, 21, 22,23, and 24 whereby the code combination set u on the transmitter T or K as the case may e, is stored up so that the transmitter may be restored to normal for the purpose of setting up a second code group while the firstgroup isbeing transmitted. An overlap relay 25, a keyboard relay 26, a lockout relay 27 and a starting relay 28 are provided, the purpose of these relays more fully appearin hereinafter.

he receivin apparatus illustrated at station'B inclu esa distributor 29 comprising a plurality of segments arranged in two concentric rings over which an arm 30 is ada ted to rotate. The arm 30 is held normal ystation'aryby means of a catch 31 under the control of releasing magnet 32, which when energized permits the arm 30 to rotate-over the segments of the distributor until it returns to its normal position where it again engages the catch 31, the magnet 32 having been in the meantime deenergized.

.There are five segments in the outer ring corresponding one to each of the impulses constituting a code group, and an additional segment for the 'urpose of sending a printi115 impulse to t in printing apparatus. In or er to register the received selecting impulses, selecting relays 33, 34, 35, 36 and 37 are provided, said relays controlling the circuits of selecting magnets 38, 39, 40, 41 and 42, to control selecting devices whereby the character to be printed is determined in a manner well known in the art. A olarizefil line relay 43 is bridged between t e line and the artificial line N, said line relay 43 being arranged to control the circuit of a relay 44 in such a manner that when current of one polarity is flowing over the line, the relay 44 will be maintained energized, but when an impulse of opposite polarity is sent over the line the relay 44 will be deenergized.

The starting magnet 32 is under the control of starting relay 45, whose circuit is so arranged that it is under the joint control of relay 44 and a control relay 46, and said circuit is only completed when, after the last impulse of a given group has been received,

a starting impulse of opposite polarity to said last impulse, is sent over the line to actuate the line relay 43. A printing relay P, an overlap relay 0, a clcarout relay and a release magnet R are provided for purposes more fully hereinafter appearing.

The a paratus of Pi ures l and 4 may now be ully undcrstood from a description of the operation.

Assuming that it is desired to transmit by means of the tape transmitter T of Figure 1, in response to the movement of the tape, the contacts of the transmitter corresponding to the perforations in the tape willbe moved into contact with the bus-bar 16. If the tape controlled lever contact 47 is closed a circuit will be completed from the negative pole of the battery ovcr ring 48 of the distributor, arm 11, catch 12, conductor 49, over the eighth normal contact of the gang switch S, over conductor 5(), switch 47, conductors 51 and 52. and through the right. hand winding of starting rclay 28 to the positive pole of the battery. Relay 28 is thereby energized and its ronl. contact completes a circuit from the positive ole of the battery through its left hand win ing in parallel with the winding of starting magnet 13, to segment 53. over arm ll and ring 48 to the negative pole of the battery. Starting magnet 13 is now energized and withdraws the catch 12 from the arm 11 which now rotates over the various segments of the distributor. As soon as the arm ll. leaves the segment 53, the circuit through the locking winding of relay 28 and magnet 13 is broken, and the magnet 13 is restored to normal.

, The arm 11 now passes over the starting Segments of the outer ring. At this time, assuming that the first, third and lifth contacts of the tape transmitter have been actuated, a circuit is completed from the negative ole of the battery ovcr the inner ring 48 o the distributor, arm 11, segment 54. conductor 55, the seventh normal contact of the gang switch S, winding of overlap relay 25, right hand contact of keyboard relay 26, upper back contact of lockout relay 27, conductor 56, bus-bar [6. first, third and fifth contact of the tape trans1nitter,.tlie upper first, third and fifth contacts of the gang switch, and through the right hand windings of storing relays 2f), and 94 to battery. The overlap relay 25 at ils upper front contact completes a locking circuit from the positive polc of the battery through the winding of the overlap relay, over the seventh contact of gang switch. conductor 55, segment arm 11 and ring 48. to the negative pole of the battery, said locking circuit remaining closed until the arm 11 leaves the starting segment. of the distributor. Storing relays 20, 22 and 24 are also energized, thcrcby cmnplcting locking, circuits from "iositivc battery through their left hand windings and over their front left hand contacts in parullcl and thence through winding of keyboard relay 2G and ovcr lhc lower wick ronlact lockout relay 27 to the negative pole of the battery. Keyboard relay 26 is thcrcby energized and at its right hand contact opens the initial energizing circuit previously traced through the overlap relay and the contacts of the tape transmitter for the storing relays. The storing relays are now removed from the control 2953921115 1 V a a :1 warn?! m? the East in;- pulse mi 1 mdv gnmp previmfly trans Hm? En setting 11%? the? imgmis s [in if; summit nsn zfivr 31m? brml 115312.219 hing rioting rviuy 24, a. "I."- 2215? been cnmpleted mm rim of thy -zti' TH the from m" r913 23% through the 1 fining raiay 5T. 11: ring 48 of the min sf the bafi'hr relay 5? Whirh H hand wimiin and cm! r-m'hu'i'. (MUSE- ica til wmitiing the 13 W9 over tiw shirt m. is (Jinnah-ind from zirg .3 of the iis- (nit WiNLi pcsitive no! right, hand right ham! aver segmrnt distributor, in {he fiery, thfirfb v enr is lacked up over its Ir-it Eran" quenfl v Pm rude gruup rim; 7 V segment a S hm fl i r grmu) Erma case 5hr file rircuig of th? poke changing relay is isroken, and u positxve lmpulsn s sr-ni t: the 1. 2.214 A? the same tune the Eur-kangwmc mg 04' the; mla y 5? simrt rircuiied from the pusitlve pair. 5: Qze 'kmitury through the pilot Ramp (50, over the wit ham? fmnt rontaci nf mhw 57 segment 61, arm 11 and ring 48 @E the :K'mmibutor, in the negative poh 0f the Rainy 5? is nnw deenergized and rasinred to nurmal.

Th? arm 11 nnw masses in the second segmen; n!" the commutator, the circuit 0f the 5m]? changing relay 14; being new imns- 'ferred to sad segment. As storing reiay 21 is 90f uperated, a circun fnr the pole hanging relay is now complrted from grmmd,

aver ring insulated rnntact 59 carried by arm 11 and the amt-0nd segment of thrmnirr ring: of the distribnmr, over the back rnntart may :21, thmngh the winding of relay 1.4- to battery. Relay 14 now operates in send a negative impulse over the line L. At the: same time, nwing in the fact that shoring rriay 24 was, hcked up upon the formatinn f the cud-9 grrsup now being trans-- n'iitt'edr a circuit is cumpiefed from the negatiw pain 0?. the battery nver ring 48. arm 11 s 58 0f the diej tributnr. thrmsgh the righfi hand wnuling of relay 537, nwr the front right hand cnntnct c-f storing relay: 24. i1 i msii'ive pnh: nf the bniiery. Relay now iorked up, thereby determining that the starting Empnisn cf the next group shafi be negaiih e, and that the last impulse 0f the present grnup aim he pnsitivn, as Wili appear later.

As the cwntaut 59 wan-mi by the arm 11 Eruvm: the mm] argmen and passes aver H19 third srgznrnt 0f the matter ring; of the 1 rahnmr. the an-iirn'iii of ihe pnlv rhanging why *2 in 1, (in by rrimon uf the fast but the st ring why 22 is: energized. A pusitive nu miwe in thriefnro arm to the line I, nw r the hack flmhlfl; m the poic hanger. At *fw same time a nin nit unmplehlii frmn rim nvgzuhvr praie of the battery nvrr riug' -18. arm 11 and segment 62 u? he ii'istrz'hntor, over mndmrtor 63, thmngh the winding of h trnnsnxiflcr magnet 1?, m'rr (:wmluct'ur M1 and. over i'rher J-ixth (-011 such nf 119 gang sw'ziyrl tn tfir mitive gmr Pu battery The magnvt 2T nf thre trunsmitfrr is now :m'nalmi t4 advance (he: tape zumthvr eaten and set up a (fi ment rnniijinaiion up0n t;he transmitter T. The new combination thus formed lines not at; this tinw precinct? any result, as the initial energizing cirrnits n? stnring relays 20 to inchasirsa are held open at. the right hand rrnnts t nf the keyboard relay 2% as already desitri mar? r Tlw arm 1], now leaw'es the third segmentnf thr outer ring (if the distributor and passe. over the fnnrih segment. As the arm L1. learns the segment 62, the circuii of the transmittvr magnet 17 is broken, and as the mntart 59 carried by the arm' 11 leaves. the third segment ofrthe outer ring and passes over the fourth se ent, the circuit of the pole chan ing re ay 14 is again completed at the rig t hand back contact of storing relay 23, thereby sending a negative impulse to theline L.

be arm 11 now leaves the fourth segment of the outer ring of the distributor and asses over the fifth segment, which it wil be noted is shorter than the other segments. As the contact 59 carried by the arm 11 passes over the fifth segment, the control of the circuit of the pole changing -relay 14 is transferred from the storing relay 23 to the relay 57 which, it will be remembered was energized -over the front right hand contact of the storing relay 24. As relay 57 is now energized, the circuit of the pole changing relay 14, which would extend from ground over the ring 58,contact 59 and fifth segment of the outer ring of the distributor, and thence over the right hand contact of relay 57 through the winding of pole changing relay 14 to battery, is now open at the right hand contact of relay 57 Consequently a positive impulse is transmitted over the line L. At the time the arm 11 started in its travel over the fifth segment of the commutator, a circuit was completed from the negative pole of the battery, over ring 48, arm 11 and segment 65 of the distributor, through the upper winding of the lockout relay 27 to the positive pole of the battery. Relay 27 is thereby energized and atits lower contact opens the locking circuits of the storing relays 20, 22 and 24 which, it will be recalled, passed through the winding of the keyboard relay 26. The storing relays and the relay 26 are thereby deenergized. The

initial energizing circuit of the storing relays is not completed, however, by the closure of the right hand contact of the keyboard relay 26, as said circuit is now held open at the upper contact of the lockout relay 27. As soon, however, as the arm 11 leaves the segment 65, the relay 27 is deenergized, and the circuit through the transmitter contacts and the storing re lays is prepared by the falling off of the upper armature of the relay 27. Upon leaving the segment the arm 11 passes on and comes into contact with the catch 12 just after making contact with the segment 53. The apparatus is now in condition for another cycle of operations. and if, as would normally be the case, a new combination has already been set up by the tape transmitter and if contact 47 is closed, the initial energizing circuit of the starting relay 28 will .be completed as soon as the arm 11 comes into engagement with the catch 12, thereby initiating the next cycle of operations.

,maining closed so lon board transmitter K, the gang switch S will be shifted to its lower position, thereby transferring the control of the storing relays 20 to 24 inclusive from the contacts of the tape transmitter T to the correspondiil g contact of the ke board transmitter Upon operating a' ey of the keyboard, a code combination will beset up whereb certain of the contracts of the transmitter are shifted from the idle bus-bar 18 into contact with bus-bar 1.9. The common keyboard contact 66 is also closed, said contact reas the key is depressed. The closure 0 this contact, assumin that the code combination set up has resu ted in the shifting of the first, second and fourth contacts of the key transmitter, completes the following circuit: from the negative pole of the battery, over contact 66, conductor 67, lower seventh contact of the ang switch, conductor 68, throu h the winding of the overlap relay 25, bac contact of the keyboard rela 26, back contact of lockout relay 27, con uctor 56, bus-bar 19 of the transmitter K, first, second and fourth contacts of said transmitter, lower first, setond and fourth contacts of the ang switch, and in parallel through the win in of relays 20, 21 and 23 to positive pole of t. e battery. Overlap relay 25 and storing re- .lnys 20, 21 and 23 are energized over the circuit just traced, overlap relay 25 completing a locking circuit from positive pole of the battery over its upper front contact, through the winding of said relay, over con ductor 68, lower seventh contact of the ang switch, over conductor 67 and common eyboard contact 66, to the negative pole of the battery. The overlap relay will therefore be maintained energized so long as the key is held depresed. vRelays 20, 21- and 23 upon being energized, at their front left hand contacts complete locking circuits from the positive pole of the battery, in parallel through their left hand windings, and over their left hand front contacts through th winding of keyboard relay 26, and over the lower back contact of lockout relay .27, to the negative pole of thebattery. -Keyboard relay 26 is thereby energized and at its right hand contact opens the initial energizing circuit of the overlap relay 25 which it will be recalled, was traced through the right hand windings of the storing relays. Conse uently the storing relays are now rcndcrcr. independent of the keyboard transmitter contacts and a new comhina tion may he set up by depressing another key without affecting the storing relays which now control the transmission of the code combination already set up. The keyboard relay 26 at its left hand front contact com plates a circuit from the negative pole of the battery, ovcrring 48, arm ll of the distrihutor, catch 12, conductor 49, lower eighth Starting relay contact of the gen switch, conductor 69, front contact of key ard relay 26, conduc tor 52 and right hand Windin of starting relay 28, to the positive pole o the battery, 28 is thereby energized and at its front eft hand Contact completes a circuit from the positive pole of the bat tery through its left hand winding in parallel with the winding of startin magnet 13, over segment 53, arm 11 and ring 48 of the distributor, to the ne ative pole of the battery. Magnet 13 is hereby energized, and withdraws the catch 12 from the arm 11, which be ins to rotate over the segments of the distri utor.

Assuming that, as a result of the combination previously transmitted, the relay 5? had not been energized, the pole changing relay 14 would have been maintained energized. while the arm 11 remained upon thefifth segment of the distributor, so that the last impulse transmitted over the line L would have been negative. As the arm 11 passes from the fifth segment of the dis tribntor to the starting segment, the control of the circuit of relay 14 is transferred to the startin segment, and said relay is now deenergize so that a 1positive starting impulse is sent over theine L. The arm 11 (her: passes to the first segment of the outer ring of the distributor, thereby transferring the control of the pole changing relay 14 to the storing relay 20. As this relay is energized, ole changing relay 14 remains dwnergize and the first code impulse is therefore positive. During the transmissio of the first selecting impulse, as the arm 11 8% over the segment Bl, the locking wind mg of the relay 57 would have been short eircuited to deenergize said relay in the manner already described, had it been energized.

The arm 11 now passes over the second segment of the outer ring of the distributor, thereby transferring the control of the pole changing relay 14 rom storing relay 20 to storing relay 21. As this relay is also energized,'p0le changing relay 14 remains deenergized, and the second selecting impulse sent to the line L will be positive. During the transmission of this impulse, the arm ll passes over the segment 58 to complete the circuit of the right hand winding of the relay 57. As said circuit is controlled by the right hand contact of storing relay 24. which relay it will he remembered is not en 'ergized during the transmission of the code combination now being transmitted, the oircuitof the relay 57 will not be completed, and said relay will not be energized. The arm 1.1 now passes to the third segment of the outer rin of the distributor. thereby transferring tne control of the pole chain; in relay 14 to storing relay 22: As this tea)! is deenergized at this time. relayll is energized. and the third selecting mpulse sent to the line L will he negative. The arm 11 then passes w the fourth scp' ment of the outer ring of the distributor,

gized by the code comhination now being; transmitted. Accordingly the Circul nl' ill t ole changing relay is completed. and the net selecting impnlsc sent to tinlinr will be negative.

As the arm 11. passed to the fifth scgnwnt 35 of the onier ring of {he distrihuirn'. said arm passed over the] segment th rein; completing a circuit from the negative pole of the hatterymver ring 48,:11111 ll andw, n! of the distributor, and through tlw r 96 windin of the loclnnzt relay 2? of the inn tive po le of the battery. Relay is now energized. opening at its lower contact the locking circuit already traced through the left hand windings of the storing relays, and through the winding of the keyboard relay 26. The storing relays are thereirv dccncrgized, and the keyboard relay 26 restored to normal, thereby preparing the initial energieing circuits of the heyboard relays at its right hanrl, earl: contact. Said circuits are held open, however, at the upper 3011' tact of the lockout relay l 1 now the hey is still held depressed, and the vonnnon keyboard contact 65 maintainml closed, the overlap relay 523 will still remain locked up, so that a locking circuit is completed from the po itive pole of the hattcry over the lower front contact of relay 27:, through the lower whaling and lower front contact of a lookout relay 2? to the negative pole of the battery. (Tonseqnmtly lockout relay 2'1 will be mainlainml energized until the key is released. This arrangement prevents the pos sihilitr of a false operation due to the con tinned depression of the transmitter key which, were it not for 1hr;- fact that the up per contact of the relay 2? is held open, would result in again setting up the same combination upon the storing relays, so that the same code group would he again transmitted.

As soon as the arm ll leaves the segment 65, the initial energizing circuit of the lock out relay 2"! broken, and if the key of transmitter H has already been restored. with the frflfafiffini nl dvenergizalion of The overlap relay 2:3. the lockout relay 2? is decncr ised. If the key is not restored this rcsu t does nor place *i? he hey is released. The arm 11 in the meantime comes into engagement with the catch 12, and rests upon the se ment 53, so that the apparatus is now rea y for another cycle of operations.

Referring now to Figure 4, which shows a form of receiving apparatus adapted to cooperate with the transmitting apparatus that t e group of selecting impulses now being received will be preceded by a positive starting impulse. The last selecting impulse of the preceding group being negative, resulted in holding the armature of the polarized relay 43 against its upper contact, so that the circuit of relay 44 is completed. As soon, however, as the positive starting impulse is received. the armature of the line relay 43 is shifted to its lower contact, thereby opening, the circuit of relay 44 which is deenergized and closes at its upper contact a circuit from the negative pole of the battery, over the upper back contact of relay 44, right hand back contact of relay 4d, windin of starting relay 45, segment 70, 'izontact%1 and segment 72 of distributor 29,10 the ositive pole of the battery, Relay 45 is there y energized, and at its right hand contact completes a locking circuit from the negative pole of the battery over the right hand front contact and through the winding of relay 45 and over segment 70, contact 71 and segment 72 of the distributor to positive pole of the battery. Relay 45 at its left hand front contact com letes the circuit of starting magnet 32 w ich withdraws the catch 31 from the. arm 30 of the distributor, permitting the arm to rotate over the segments of the distributor. As soon as the contact 71 of the distributor leaves the se merit 70, the starting relay 45 is deenergize thereby deener izing starting magnet 32.

As t e arm 30 rotates, contact 71 passes over the first segment of the outer ring 0 the distributor. Segment 73 of the inner ring of the distributor, it will be noted, is connected to the lower contact of relay 44. At the instant that the contact 71 passes over the first se ment of the outer ring of the distributor, t e first selecting impulse will be received from the line, and as said impulse is positive, relay 44 will remain dcenergized so that a circuit is completed from the nega' tive pole of battery over the lower back contact of relay 44, segment 73, contact 71 and the first segment of the outer ring of the distributor, and thence through the winding of selecting relay 33 and over the normal contact of the release maggot R to the itive pole of the battery. lay 33 is loc ed up over a circuit from the ne ative ole of the battery, through the win ing 0 relay 74 upper front contact of rela 33, and norma contact of release we net to the positive pole of the battery.- The relay 74 which is energized over said circuit is inefiective at this time.

The arm 30 now continues to rotate until the contact 71 passes over the second segment of the outer ring of the distributor, at which instant-the second selectin impulse is being received over the line. The impulse being negative the polarized relay shifts its armature to its upper contact, completing thecircuit of relay 44 which at its lower contact holds open the circuit extending from the second segment of the outer rin of the distributor to the relay 34. Accor ingly selecting relay 34 is not operated. The arm 30 now continues rotating, and as the contact 71 passes over the third se ment of the outer ring of the distributor, t e third selecting impulse is received over the line. This impulse being positive, relay 44 is deenergized, thereby completing a circuit from the negative pole of the battery over the lower back contact of relay 44, segment 73, contact 71., and third segment of the outer ring of the distributor, through the winding of relay 35 and over the normal contactof the release magnet R to the p itive pole of the battery. Relay 35 is thereby energized and comp etes a locking circuit similar to that already traced for relay 33. Similarly as the arm continues to rotate, a negative impulse is received as the contact 71 passes over the fourth segment of the outer ring of the distributor, and the positive impulse is received as it passes over the fifth segment, The negative impulse receivedas the contact passed over the fourth segment, produces no effect upon the selecting relay 36, but the positive im also received as the contact passes over t e fifth segment, results in the deenergization of relay 44, with the consequent closure of a circuit from the negative pole of the battery, over segment 73, contact 71 and fifth segment of the outer f ring of the distributor, through the windin of selecting relay 37, and over the norma contact of release magnet R, to the positive pole of the battery. Relay 37 closes a lockmg circuit from the negative pole of the battery, through the winding of the relay 74, through the right hand wlndin of relay 46, over the upper front contact an winding of relay 37, and over the normal contact of release ma not B, to the positive pble of the battery. %electing relays 33, 35 and 37 ill] llu

e new energized, thereby completing at aell' lower contacts, circuits from the nega ve pole of the battery, through the wind- .ngs of selecting magnets 38, 40 and 42, over he lower front contacts of the correspondng selecting relays, and over the left hand back contact of overlap relay to the positive pole of the battery. The selimting mag nets shift the disks of the selector, not shown, to determine the character to be printed.

The circuit just traced through the right hand winding of the relay 46, results in the energization of said relay, which thereupon completes a locking circuit from the positive pole of the battery, through left hand winding and overthe left hand Contact of said relay, over the right hand normal conftact of relay 45, to the negative pole of the battery. Relay 46 now remains energized until the starting relay 45 is ener ized in response to the next starting impu so. He lay 46 at its right hand front contact, shifts the control of the starting relay circuit from the up er back contact of relay 44 to the upper ront contact of said relay. As the last selecting impulse just received was positii'e. relay 4% is at this time deenergizetl, so that the circuit of the relay 45 will not now he completed until a negative starting impulse is received.

in the meantime while the operations just described have been taking place. the arm has continued to rotateyso that the contact 71 asses over segment P of the outer ring 0 the distributor thereby closing a printing circuit from the positive pole of the battery, over segment 72,, contact 71 and segment P of the distributor, over the lower 43 front contact of relay 74, through the wimling of the printing relay I, and over the bark cont not of the ciearout relay (1, to the negative pole of the hattery. The printing relay is thereupon energized, and compietes 45 a lOC'klng circuit from the positive pole of the battery through the windings of release magnet, R. the upper front contact of print ing relay P and hecir contact of relav to the negative poie oftiie battery. he re lease magnets R being actuated. shift the stop her, not shown, into the alined slots of the selector disks and the printing operations proceeds. The release magnets R also operate to open their normal contact, therehv disconnecting the positive pole of the hhttcry from the windings of the selecting relays. which are thereupon restored to normal. At the same time, the front contact of the release magnet ie rleseil completing; m a circuit from the positive pole the hattery through the overlap relay U to the ne {.ive. ole of the battery. The overlap re 3 O is thereupon energized. anti at loft hgnd contact opens the circuit of the selector magnets. restoring them to nominal end at its front leit hanii ntaee connects; the )ositivc pole of the i rv with the win ings of the now restored helesilng TL lays which are again in condition to receive the new set of selecting iinpnises while the 1'0 printing operation resulting: from the pre ceding set proceeds. At the and of the print ing operation, the element relay (f operated, thereby opening the cirvuit oi the printiii-g relay 3 and we rcleaee znlgnei, it e d in restoring the circuits to the iiormnl contiillOHL While the printing operation bein started, the arm 31'? rontinnee to rotate until it engages with the catch iii, whereupon it so comes to rest untii e starting impulse la egain receiver}; As already poinlcti out, the last selecting impulse received being posi tive, the relay 44 is deenergizeth so that no circuit is completed through the starting relay -15. hut soon as a negative starting impulse is received the relay "714 will be. energized" thereby completing a circuit from the negative pole oi the .nitery over the upper front contact, of relay i4 and the right 99 hand front contact of relay 46. through the winding of the starting relay an over segment 71 contact 7'1 and segment 2'2 of the distrilmior. The arting relay inns tions 'eci'ore in rele ee the ar at? its right hand front -.,:onta.ctopens the looking circuit previously i wed {or the relay ii which new re rei'i to normal. Relay so will not again he until the last selecting inipnise of a reeeiveti code ME group is passer. it will. thus he soon that. the r l ll he releeseti when the group is followeei in a opposite "olarit n m li'lfiti one of rece errnnge= meet is shown in Figure 5, sea; erren :uent riifiering from that Figure 4 in that the distributor has certain norii nai sege mentsf which circuits are ronne efi whereby the first received ee'iecting: iFIEIl lF-P may he storeii up on the ttfliltllii it at once afiecting the first se relay 33. This arrangement allows "it time for the release magnets ll Elli e51 relay t) to he energized. to pre; rcuit for the actuation of the seient s. The arrangement shown in Fign from that in Figure 4 in t. .1. a somewhat difi'erent means for 'mntroliing the circuit 159 of the stal'iing relay 45 provided This controlling means will be more fully under stood from a description oi the operation.

' Assuming that the 's-eceireal inlet-ting impulse was negative therein}: is energized. open s mg a POSiilV starting impulse from the ii L the polarized relay e3 will shift its ifiwiillli'fi, the ehy opening the circuit of relay :11. E 4 thereupon at its lower hack contact completes a circuit from the negative pole of the hatter orcr back contact of relay 44 and throu h winding of relay T7. to positive pole of battery, and in parallel with the windi relay 7?, over the upper hut-.1; contact oi relay, through resistance coil Ti throng Winding of starting relay 55 and over sc p mcnt Tl], contact Ti and segment 72 of the distributor, to the positive polo ot' the hat tel-5'. Relays 77 and 4:: are thereupon 131ml gized, the latter closing a in hing circuit over its right hand front contort ihrongh is winding and thence over the circuit illlr viously traced, to nuiintiiin saitl relay ener gized until the contact 71 leaves segment It). Starting relay 4- at its leftv hand contact closes the circuit of starting; magnet 32, which withdraws the catch 31. from the arm 30, permitting it to rotate. is the sun so rotates, the contact Tl posses over the first segment of the outer ring of the dis .tior. At this moment. the first sele ting impulse is being: receiredover thelinc L, and assuming; this impulse to be positive, the relay 4i rt mains deenergizcd so that the circuit. of the relay 7? is completed over its lower hack rout-act. Relay 7? being energized connects the negative pole of the. battery over its lower front contact, over segment 81, Contact T1. and first segment of tl'taouter ring" of the distributor, to the condenser T6, thereby charging said condenser. As the arm 30 continues to rotate, the contact T1 passes over the second segment of the outer ring; of the distributor. At this time. a second so lecting impulse is being received. and assuming: this impulse to he negative. relay it is energized, thereby opening: the circuit of relay 7'? and closing the circuit oi relay T8, The deenergization of relay 7? opens a circult which would otherwise he completed from the negative pole of the liattcry and over segment; 81. contact and the second i 1. segment of the outer ring of the distrihntor to the winding of selecting relay ill. At cordin zly. selecting reluy Iii is not operated.

Astlle arm iit'leontinut-sto rotate. it posses over a segment R2 located midway between the second and third segments of the outer ring of the distributor. circuit is thereby completed from the cornlenscr 70. over segment. 82, contact 71, segment 815. through the winding of selecting relay 32S and over the normal contacts of the release magnet it. to tlupositive pole of the battery, 'lhccondmu scr Til is thereby discharged through this rir cult. (.lltllllllllfj the selecting: relay 32i which is locked up through the winding of relay Ti. and completes the circuit of selecting nun net 3H. Upon further rotation of the an 30. the contact 71 msses over the third su n t. ment of the outer ring or the distriluuor at the some instant that the third selecting Inipulse is being recezrctl. As uming this no pulse to be positive, tin: relay it is ilccncl glazed, completing a circuit for the relay 77 which in turn connects the negative pole of battery over its lower front contact and over segment 84, contact 71 and the third segment. of the outer ring of the distributor, through the. winding of selecting relay 35, to the positive pole of the battery. Selecting rchiy H5 is thereupon cum-glued, closing its locl ing circuit, and completing the energizing circuit at? selecting magnet. 40. The arm 30 now carries the contact 71 over a segment 85, midway hetween the third and fourth segments of the outer ring of the distributor. circuit, is thereby completed from the condenser T6 over the segment 85, contact 71 and segment 56 of the distributor, to the positive pole of the battery, thereby completely discharging the cont enscr 76, if said condenser had not already been completely discharged through the winding of selecting relay 33. As the fourth selecting impulse being received, the contact 71 passes oi er the fourth segment of the outer ring of the distributor. if this impulse is negative, the relay 4A is energized, completing the circuit of relay 78 and opening the circuit of relay 7?. As a result, no circuit is completed over the fourth segment, through selecting relay 36. The arm 30 now carries the contact, T1 over the ti'fth segment of the outer ring of the distrihutor. as the last selecting impulse is being received. Assuming this impulse to be positive, a circuit would be completed from the negative pole of the batter through the lower front contact of relay 7!, over segment; 81'. contact 71, and fifth segment of the outer ring of the distributor, through winding of selecting relay 3?, to the positive pole of the battery. Relay 37 is thereupon locked up and completes the circuit of selecting magnet 42. The contact 71 is then carried over the segment P. thereby completing the printing circuit from the posit ire pole of the battery, over segment 72, contort Ti. sc nnent l. lower front 'contact of relay T-l, winding of the printin relay P and back ('(mtm'l of the clearout re 21y C, to the negative pole of the battery. The printing operation now proceeds as described in connection with Figure 4, and need not be further considered.

As the arm 30 continues to rotate it comes into engagement with the catch 31 and is hrought to rest awaiting the starting inlpulse. .\s the lust I'tt'ciYt'tl selecting impulse \VtlS positiro. the starting impulse must now he negative. The last positive selecting; impulse it will he 'rcmeinlwrcd. resulted in the tlt-rncrgliznti n of the relay H. with the consequent t-ncrgizatiou of the relay T7. Relay TH now deem-ruined and as soon as a negative tarting impulse is received the relay -14 will be energized, thereby completing the circuit of the starting relay 4:) over the lower front contort ni' rt-lnv H, buck contact of relay 78, resistance coil 80, winding of relay 45, segment 70, contact 71 and segment 72 of the distributor, to the positive pole of the battery. The distributor will themupon be released by the release magnet 32, and the operation proceeds as already described.

A still further modification of the receiving apparatus is illustrated in Figure 6. In this arrangement the control of the starting relay 45 is the same as in Figure 4. The arrangement for storing up the first received selecting impulse to allow suflioienttime for the printing operation to. proceed, in this form consists of a storing relay 88, whose action will be more fully understood, from a description of the operation.

Assuming that a startin impulse has been received so that the re a 45 is energized to complete the circuit o? the starting magnet 32, t e catch 31 will be withdrawn from the arm 30 as before, permitting the arm 30 to carry the contact 71 over the first segment of the outer ring of the distributor. At this instant, as a positive selectin impulse is being received, the relay 44 will be deenergized, thereby completing a circuit from the negative pole of the battery, over the lower back contact of relay 44, segment 89, contact 71, and first segment of the outer ring of the distributor, through the winding of the relay 88 to the positive pole of the battery, thereby ener 'zing the relay 88. Relay 88 thereupon cfiises a locking circuit from the positive pole of the battery, through the Windin and over the lower front contact of sai relay, to the negative pole of the battery.

As the arm 30 continues in its travel, the

contact 71 passes over the second so cutofthe outer ring of the distributor. um. that the selecting impulse received at this moment is negative, relay 44 will be energized, and no circuit wil be completed for the selecting relay 34 over the second segment of the outer ring of the distributor. The arm 30 now carries the contact 71 over a segment midway between the second and third segments of the outer ring of the distributor, whereupon a circuit is closed over the upper front contact of relay 88, and over segment 91, contact 71 and segmeat 90 of the distributor, through the winding of selecting relay 33, over the normal contact ofrelease magnets'R, to the positive pole of the battery. It will thus be seen that the first selecting impulse is stored up by the relay 88 and is not efl'ective to actuate the selecting relay until after the second selecting impulse has been received.

The arm 30 now continues rotating. thereby carrying the contact 71 over the third segment of the outer ring of the distributor, whereupon, assuming that a positive impulse is at this moment being received over closed from closes a locking circuit from t l han the line, a circuit is closed from the negative pole of the battery over the lower back contact of relay 44, segment 92, contact 71 and third segment of the outer ring of the distributor, through the winding of selecting relay 35, to the positive pole of the battery. Selecting relays 33 and 35 when actuated, are locked up in the manner described in connection with F igures 4 and 5, and close the circuits of the selecting magnets 38 and 40. The contact 71 now passes over a segment 93, midway between the thii and fourth segments of the outer rin of the distributor, thereby short-circuiting the winding of rela 88 over a circuit from the positive pole o the battery, over segment 94, contact 71 and segment 93 of the distributor, over the lower front contact of relay 88, tothe negative )ole of the battery. Relay 88 is thereupon eenergized and restored to normal.

The distributor now continues its rotation, passing over the fourth and fifth segments of the outer ring of the distributor, and assuming that the correspondin impulses are negative and positive res rctively, the selecting relay 86 is unactuate but the positive im ulse results in the de-energization of re 44, whereupon a circuit is e n ative pole'of the battery, over the lower ,ha i contact of relay 44 and over ment 95, contact 71 and fifth segment 0 theouter ring of the distributor, through the wind' of selecting relay 37 to the positive pole d the battery. Relay 37 its lower contact, and at its up er contact e positive pole of the battery through the normal contact of the releasemagnets B, through the winding and over the upper front contact of relay 37, throu h the ri ht ha (1 winding ofrelay 46 and tfirough t e \vin din of relay 74, to the negative pole of the hattery. Bela 74 had already been energized over the ocking circuits of the other selecting relays, but the circuit just traced results 1n the energization of relay 1-6. which comgletes a locking circuit through its left winding and over its left hand contact, and through the normal contact of starting relay 45 as already described. The relay 46 at its right hand contact. shifts the con trol circuit of the starting relay 45 from the back contact of relay 44 to the front contact of said relay. As the last selecting impulse was positive, relay 44 is at this time do energized, and the circuit of the starting relay 45 cannot be closed until a negative impulse is received.

In the meantime the arm 30 has carried the contact 71 over the printing segment P of the outer ring of the distributor, thereby completing a circuit for the printing mag net whereupon the sequence of printing 100 closes a circuit for selecting magnet 42 at impulses.

operations already described takes place. The arm continues its rotation until t engages with the catch 31, whereupon It comes to rest. The apparatus is now in condition to receive a new series of code As soon as a negative starting impulse comes over the line, relay 4ft is energized, thereby completing the circuit of starting relay from negative pole of battery over the upper front contact of relay 44, right hand front contact of relay 46, winding of relay 45 and over segment 96, contact 71 and segment 97, to the positive pole of the battery. The energization of relay 45 over this circuit, releases the brush arm for its next cycle of operations, and at the front right hand contact of said relay opens the lockiugcircnit of relay 46, which is restored to normal.

It will be understood, of course, that any one of the receiving arrangements shown in Figures 4, 5 and 6 may be used with the sending arrangen'lent illustrated in Figure 1. Figure 2 illustrates a modified form of sending arrangement which involves the same principles as. that of Figure 1, and

which may 1e used in connection with the receiving arrangunents shown in Figures 4. 5 or 6. In the arrangement of Figure 2 the pole changing relay 14 is eliminated and the positive and negative selecting impulses til'i' sent over the line directly under the control of the storing relays. In order to accomplish this result, the line L is connccted directly to the ring 58 of the distributor, while the starting and selecting impulse segments of the distributor are connected to-contacts of the first four storing relays, and to contact of the controlling relay 57. The contacts of these relays determine the polarity of the impulses sent to the sereral segments.

The operation of the modified features of this arrangement is the same, whether the tape transmitter T or the keyboard transmitter K is used, and consequcntlyjt will be unnecessary to describe the operation with both transmitters. Assuming that the keyboard transmitter is to he used, the depression of a key of the keyboardshifts a certain combination of the five keyboard selecting-contacts and closes the common keyboard contact titi thereby completing the circuit of the overlap relay 2."), said circuit being the same as that already traced in connection with the description of the apparatus in Figure 1. Assuming that the first, third and fifth selecting contacts are operated, the overlap relay 25 and storing relays 20, 22 and 24 will be energized over this circuit. The overlap relay 25 is locked up as described in connection with Figure I. and the storing relays 20, and 24 cont )lete locking circuits through their left hand windings and the winding of the he}? board relay 26 as already described. Keyboard relay 26 as before opens the initial energizing circuit of the storing relays, thereby rendering them independent of the eyboard transmitter, so that a new combination may be set up by the depression of another key, without affecting said storing relays. Keyboard relay 26 at its left front contact, completes the circuit of starting relay 28 as described in Figure 1. Relay 28 is energized and completes at its left hand front contact the circuit of the starting magnet 13, whereupon the catch 12 is withdrawn from the arm 11, and the arm 11 rotates over the segments of the distributor. Assuming that the last impulse of the previous code group was negative, the relay 57 will be unactuatcd and as the arm 11 carricsthe contact 59 over the starting segmcnt S of the outer ring of the distrilmtor, a positive starting impulse is sent to the line over a circuit from the positive pole of the battery, over the right hand back contact of relay 5?. over starting segment S, contact 59 and ring 58 of the distributor to the line L.

The arm 11 now leaves the starting segment. S and passes over the first segment of the outer ring of the distributor. As storing relay 20 is actuated, a positive selecting impulse is sent over the line from the positive pole of the battery, over the front right hand contact of storing relay 20, first segment of the outer ring of the distributor, contact 59 and ring 58 of the distributor, to the line L. At the same time the left. hand Winding of the relay 57 is short circuited over the segment 61 in the manner described in Figure 1, to d eenergize said relay, had it been previously energized. The arm 11 now carries the contact 59 over the second segment of the outer ring of the distributor. Storing relay 21 being deenergized, a negative impulse is sent to the line from the negative pole of, the battery, over the back contact of storing relay 21, over the second segment of the outer ring of the distributor. contact 59 and ring 58 of the distributor, to the line L. At the same time a circuit is completed from the negative pole of the battery, over ring 48, arm 11, segment 58 of the distributor. through the right hand winding of the relay 57, over the right hand front contact of storing relay 24, to the positive pole of the battery. Relay 57 is energized over this circuit, and thereupon completes its locking circuit and shifts the connections of the fifth and starting segments of the outer ring of the distributor.

The arm 11 now rotates over the third and fourth segments of the outer ring of the distributor, thereby transmitting positive and negative impulses over the front contact of storing rclay and oyer the back contact of storing relay 23 respectively. As the arm 11 leaves the fourth segment, and passes over the fifth segment of the outer ring of the distributor, the fifth selecting im ulse is sent to theiine. The circuit for t is impulse may be traced from the ositive pole of the batter over the middle front contact of relay 5;, and over the fifth segment of the outer tins of the distributor, contact 59 and ring 8 of the distributor to the line L. At the beginning of this impulse, a circuit is completed from the negative pole of the battery, over the ring 48, arm 11 and segment 65, through the upper winding of the lockout relay 2?. Lockout relay 27 operates as described in connection with Figure 1 to onen at its lower contact the circuit of the keyboard relay 26 and at its upper contact to hold open the initial energizing circuit of the storing relays through the contacts of the keyboard transmitter. Said lockout relay 2? at its lower front contact completes a locking circuit for itself, so long as the overlap relay 25 is maintained locked up by the continued depression of the key of the keyboard transmitter K. It the key K has already been restored. or as soon as said key is restored, the overlap relay as is deencrgizcd: and the locking circuit of the relay 27 is opened, so that said relay is restored to normal and the apparatus is ready for a second cycle of operations as soon as the arm 11 engages with the catch 12.

It will now be noted that the last impulse sent to the line was positive. and said positive impulse continues so long as the arm 11 remains upon the fifth segment of the distributor. As soon as the arm 11 is released by the depression of another kcy. thereby passing over the starting scgmcnt S, a ncgatirc impulse will be sent to the line over the front right hand contact of the relay 5T. It will thus he sccn that the starting impulse is at all times opposite in charactcr to the last selecting i|n pulse, the character of said impulses bring determined by the relay 57.

A third form of transmitting :i 'iparatus which may be uscd with any one of the re ceiving arrangements shown in Figures 4, 5 and 6. is illustrated in Figure 3; This arrangement difl'crs from that of Figure 2 in that the selecting contacts of the tape transmitter T normally rest upon-Ta busbar 15 connected to the ne ative pole of the battery, the first four 0 said contacts being connected through the gang switch, directly to the first tour selecting segments of the outer ring of the distributor. while the last contact is connected through the gang switch to relay 5? which functions in a manner analogous to that of the relay 57 in Figure 2 to dctcrmine the polarity of the last selecting impulse and the starting impulse. Said selecting contacts of the tape transmitter are adapted to be moved in accordance with the perforations of the tape into contact with the bus-bar 16 connected to the positive pole of the battery. By this arrangement the first four selecting impulses are transmitted to the line directly over the contacts of the tape tra: s mitter, without the interposition of storing relays, while the last selecting impulse operates a storin relay 57 so that the transmitter magnet 1% may be actuated to shift the tape during the transmission of the last selecting impulse.

,A keyboard transmitter is so arranged that the combination set up upon said trans mitter is transferred to the storing relays 20 to 24 inclusive, said storing relays controlling the connections to the selecting and starting segments of the outer ring of the distributor in a manner similanto that of Figure 2, so that the polarity of the selecting and starting impulses are determined dircctly by said relays. The arrangement differs from that of Figure 2, however, in that the connections from the contacts of the storing relays to the selccting and starting segments of the distributor, pass through the contacts of the gang switch, so that said connections may be shifted from the control of the storing relays to the tapc transmittcr contacts or vice versa. as desired.

Assuming that thc tape transmitter is being used, and that the first, third and fifthcontacts of said transmitter have been shifted to the bus'har 1(i,'the closure of the tape control lcrcr contact 4? completes a starting circuit from the negative pole of the battcry over segment 100. of the inner ring of the distributor; arm 11. catch 12. conductor 49. eighth contact of the gang switch, conductor 50, contact 47, conductors 51 and 52 and through thc right hand winding of starting relay to the positive pole of the battery. Starting rclay E28 completes the circuit of starting magnet 13 in the warmer described in conncction with Figure 1. The catch 12 is tlicrci'orc withdrawn from the arm 11. which rotates over the segments of the distributor. The polarity oi the starting impulse to he sent to the linc will now depend upon the polarity of the last selecting impulse pim'iously transmitted. Assuming said last selecting impulsc to harc been ncgativ.. the relay 5? will he unactuated, and at the time the catch 12 was withdrawn the circuit for said last selecting impulse might have bccn traccd from the negative pole of the battery over the upper back contact of relay 57, orcr the fifth selecting seg ment of the distributor and over contact 59 and ring 58 of the distributor, to the line L. As the arm 11 lea us the fifth segment of the distributor and passes over the starting segment 5, a positive impulse is sent to the line from the po itire pole of the ln'ltter v over the middle back Contact of the relay and over the starting segment S, contact 59 and ring 58 of the rlietrihutur. to the line L.

The arm 11 non leaves the flirting segment S and [meson over the first selecting se ment of the distributor, whereby the first so eeting impulse is transmitted over a cir cuit from the positive pole of the battery. bus-bar 16, first selecting contact of the tone transmitter T. first contact of gang switch S, and over the first selecting segment of the distributor. contact 55% ring :38, to the line L. At the some time n short circuit for the lower locking winding of the relay 57 is closed. from the positive pole of the battery. through the lamp 60. over the lower front contact of relay 57 and over segment 61, arm 11, and segment 100 of the distributor, to. the negative pole of the battery. Had the relay 57 been at this time ener ized, the short circuiting of itslower win ing would have restored it to normal.

The arm 11 now passes over the second selecting segment of the distributor, Whereupon a negative selecting impnise is train mitted from the negative pole of the bet-- tery, over bus-bar 15. second contact of the tape transmitter, second Contact of the gang switch, second selecting segment of the distributor, contzgct 59 and ring 58 of the distributor, t0 the line L. The arm 11 of the distributor-now passes over the third selecting segment of the distributor, thereby trans mitting a positive selecting impulse from the positive pole of the battery. over the haw bar 16, third contact of the tape transmitten third Contact of the gang switch. third seleeting segment of the distributor. contact 59 and ring oi the distributing to the line L. At the some time. since the fifth contact of the tape transmitter i: shiited into contact with the positive bus-hur- 16. a circuit for relay 57 is completed from the positive pole of the battery, over the husbar 16, fifth contact of the tape transmitter. fifth contact of the gang switch. upper winding of relay 57. segment 10L arm 11, seg

ment 102 of the distributor, to the negative pole of the battery. Relay 5'? is energized over this circuit. and completes a. locking circuit through its lower winding and over its lower front contact, "through the lamp 60. The energization of this: relay shifts the connections of the fifth selecting segment and the starting Segment of the outer ring of the distributor. Had the fifth contact of the tape transmitter been unac-tunted, so that it rested against the negative hue-her 15. the relay 57 would not have been no tuated. as both terminals of its upper winding would have been connected to the neg-(1- tive pole of the battery.

The arm 11 now continues its rotation and passes-over the fourth selecting segmen! of the distributor, thereby transmitting :i nhgniirr impulse to the liue From the negative pole of the better; over the iv-u?! her fourth contact. of the tape tree mitirrxfenrth contact of the gum: switch. fourth minding: negnu-nt oi' the dielrilmfnri contort 5E? and ring 5H of the distributor; to thrliml; A! the same time :1 cir uit is completed for tho trunemil'tcr magnet li. fr m the ilt 'il lii'f ml!- of the hailrr. over I I "in ll and segment llliini flu" His r'limior. over mnducior l winding of tran mitter magnet 3T. IHlillilltul Miami sixth contact of the gIRI'iQ sn'ilrla. to the positive p1; of the buttery. The li-un"1iiittm' magnet is new actuated to shift the lane Which may he done at this time without afierting {he impulses tri-in mittwi. as he first four :-=electing impulers haw ahead; been ifruimuilted and the fifth impulsiis stored up by the relay 5?.

The arm It now pn soe over the fifth relating eg ment of the distri uuor. thereby irsrr; tting :1. positive selecting impulse to the line from the positive pole of the hatt r our the ier front cvntart of r lay 5'? owl the fi'iiii ech -ting gineiut. reirntu t Mill ring 5, of the li trilmt ir. to the line ll. At the beginning of this ll'fll iiltt'? it circuit lso completed from the ncgetiw pol oi me hatter over the sup ment lul arm i1 and segment (J of thedlstrihuter, thiu'iugli the lower windin mi the ookout relay 2?, to the positive pole of the liuliw" Lockout relay ET is oncisfizml. Z n Hi this limo i Without 1 arm l1 e'u'itin'uo ts rolritiiin ages the etch l2. 1: it 1 L The List Fitl("ll'lij impelse r. liilgf trunsmitled lining; push the arm ll again be wh n l panning urcr the starting HQlau l 51. :1 negative starting impulse will he Irene zniiieii to line 'i'run': tlll negative pole of tho iizil't rip ever the middle front vontzi t relay starting segment S. contact and ring .38 of the ilistrihutoiq to the line l.

in were her hoard trunemittrr K should he use-l for transmission. the gang: switch wiii he thrown to the right. thcirli (liQIllP-q meeting the trunsmitler and connecting the controlling router-ts of the storing relnye to the alieirihutmx Upon depressing a he of the transmitter. it combination of the selecting contacts will be shifted into contaet with the bus-liar l9. and the common liQVl'iUftiti contact 66 wiil he closed. Assuming that the first hird 3 iiith selecting contacts are shifted. or will now he closed from the negati'w pine of the hattery over rontnct 66. conductor 67, seventh Contact of the gang switch. conductor 68, winding 0? overlap relay 25. back right hand Contact of the keyboard relay 26, lower back contact of the lookout relay 27, contery.

ductor 56, bus-bar 19, first, third and depressed. Storing relays 20, 22 and 24 are also energized. thereby completing locking circuits from the positive pole of the hattery, through their upper locking windings and upper front contacts, through'wintling of relav 26, and over the up er back contact of the lockout relay 27, to the negative pole of the battery. Keyboard relay 26 is energized over this-circuit, and at its right hand contact opens the initial energizing circuits of "the storin relays, so that a new key may be depresse without affecting the combination now being transmitted. At its left hand front contact relay '26 completes a starting circuit from the negative pole of the battery, over segment 100, arm 11, catch 12, conductor 49, eighth contact of the gang switch, front left hand comact of he board relay 26, conductor 52 and right hand winding of starting relay 28, to the positive pole of the battery. The actuation of starting relav 28 results in the withdrawal of the catch '12 from the arm 11, which now proceecls to rotate over the segments of the distributor. The starting impulse will be transmitted as socn as the contact 59 passes over the starting segment S, and its polarity will be determined by the polarity o the last selecting impulse preceding. Assuming that the last selecting impulse was positive, relay 5? would have been actuated and the circuit of the last selecting impulse might have been traced from the positive pole of the battery over the upper front contact ofrrrelay 5?, through the fifth selecting segment of the distributor contact 59 and ring to the line. 'As soon as the arm 11 leQves'the fifth selecting segment and passes (are? starting segment S a negative starting impulse will be'transmitted from the negative pole of the battery over the front middle contact of relay 5?, over segment- S, contact 59 and ring 58 of the distributor to the line L.

The selecting impulses are now under the control of the storing relays 20 to 24 inclusive, and as the arm 11 passes over the first selecting segment of the distributor, a selecting impulse is transmitted from the positive pole of the battery. over the lower front contact of storing relay 20, over the first contact of'the gang switch. first selecting segment of the distributor, contact 59.

ring 58 to the line L. At the same time a short circuit is completed for the lower lockmg winding of the relay 5? from the nega tive pole of the battery, over segment 100,

arm 11, segment 61, lower front contact of relay 5?, lam 60, to the positive pole of thebattcry. ltelay 57 is now deenergized and restored to normal thercb shifting the battery connections oi the fth selecting segment, and the starting segment of the distributor.

The arm 11 now passes over the second selecting segment of the distributor thereby transmittin a negative impulse m the negative po 0 of the battery, over the lower back contact of storing relay 21, second contact of the gang swite {second selecting segment of the distributor, contact 59 and ring 58 to the line L. The arm 11 next passes over the third selecting so out of the distributor, thereby transmitting a positive selecting impulse from the positive Pole of the battery, over the lower front contact of storing rela 22, third contact of the gang switch, t ird selecting segment of the distributor, contact 59, arm 58 of the distributor, to the line L. At the same time, inasmuch as the fifth storing relay 24 is now energized, a circuit is completed for the relay 57 from the positive pole of the battery, over the lower front contact of the relay 524, fifth contact of the gang switch, through the upper winding of relay 5?, so out 101, arm 11 and segment 102 of the to the negative pole of the battery. Relay 57 is thereby energized and locked up as before, again shifting the connections of the selecting segment and the starting segment S of thedistributor. Had the storing relay 24 been unactuated, the relay 57 would not have been energized, both terminals of its upper winding would have been connectedto the negative pole of the battery.

The arm 11 now passes over the fourth selecting segment of the distributor, thereby transmitting a negative impulse to the line from the negative pole of the battery, lower back contact of storing relay :33, fourth contact of the gangswitch, fourth selecting segment of the distributor, contact 59, ring 58, to the line L. As the arm it continues in its rotation, it passes over the fifth selecting segment of the distributor, thereby transmitting the last positive seleotingdmpulse from the positive oole of the battery, over the upper front contact of relay 57, fifth selecting segment of the distributor, contact 59 and ring 58, to the line L. At the beginning of this impulse a circuit was also completed from the negative pole of the battery, over the segment 100, arm 11 and segment of the distributor, to the lower winding of the lockout relay 27. Said relay is thereby energized and at its upper contact opens the locking circuit previously traced through istributor,

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