US1793448A - Multioffice telephone system - Google Patents

Description

Feb. 17, 1931. R. F. STEHLIK 1,793,448

MULTIOFFICE TELEPHONE SYSTEM Original Filed April 22, 1927 4 Sheets-Sheet 1 Eudalpl-LF Siahlik Feb. 17, 1931.

rag? R. F. STEHLIYK' 1, 4

MULT IOFFI CE TELEPHONE SYS TEM Original Filed April 22, 1927 4 Sheets-Sheet 2 Feb. 17, 1931.

R. F. STEHLIK MULTIOFFICE TELEPHONE SYSTEM Feb. 17, 1931. R. F. STEHLIK MULTIOFFICE TELEPHONE SYSTEM Original Filed April 22, 1927 4 Sheets-$heet 4 XXX x VAX X Inuen up Eudrlph F. EEhlik' PatentedFeb. 17, 1931 l OFFICE 1;:

COMPANY, OFKANSAS' orrY, /rrssonnrn CORPORATION: OF DELAWARE MU 'rIorrrcn rerun-mun SYSTEM Application filed April 22, 1927, Serial completed by means of automatic switches,

andithe object of the invention is to provide new and lmproved c rcu t arrangements for handling inter-office calls between the automatic andmanualenchangesr V Systems having both kinds 'ofrexchanges as. aboyepointed out are becoming quite- .0m-

mon and may arise either by consolidation of exist ng manual and automat c systems, serving the same territory, :or by theprocess of changingovera manual system to an automatic' system. Usuallyin the latter case only one office at .at1me 1s converted from manual to automatic and it follows that duringthe period-of transition there Will necessarily be both kinds of oflices in operation. However I the aboye s tuation may ar1se,1t 1s necessary to prov de suitable-circuit arrangements for handling calls from the manualofiicesto the automatlc oflices, and from the automatic ofiices to the manualoflices; V The present.111.-

yentionis concerned only with the latterclass -of calls, ,and provides certainimprovements vto the operatorone after the other as fast in asystem comprising automaticto'manual trunks which are, accessible to' selector sw tches. n ;the automat c offices: .and tennis -ne te' in plugs in front ofa Bop u tor at thev 'inanual oiiice, together with v call registers for registering the digits in telephone ,n'u mbers called by automatic subscribersi when the trunksare taken into use,- and: an indicating device upon :Which such numbers are shown as she can complete the ,cle'sired'connections.

lnlgnown systems of this type a small group of call reg ster sets are usually pro lv ided to serve a comparatively large group of trunk lines and so called reglster-selectors are used for associating, lines idle register sets; With this arrangement it is necessary for the register selectorassociated s -withthe trunk line use to select an idle N'o. 185,698. Renewed m 16, 1930.

register set before the lsecond digit of the callednumber is dialled, otherwisetrouble occurs. If the second digit ofa telephone numberis dialled before the register selector has selected an idle register set it Will. result in a fmutilated call or a Wrong number depending on Whether the second digit is, entirely lost or-not A mutilated call is' a call in which the completesecond digit of the callednumber is lost. The remaining digits of the called number are registered on the registers and are subsequently displayed ;to- .the'operator after a certain time-interval if the register selector has in the meantime selected an idle register set. In such cases only a portion of a complete number is displayed,

[nonorrn FRANK srEnLrK, or enroAediLLmors, essreno n TO RESERVE Horn-rue and the B operator connects the calling party I to the trouble operator Who either completes the call or advises the calling subscriber to hang up and call again; A call will result in awrong number if a portion of the impulses of the second digitis lost While the remaining impulses of the second digit are recorded on the register set which has just been seized bythe register selector. In this case a complete number Will be displayed, and the operator has no Way of telling that such numberwas not eorrectlyregistered and therefore when the operator plugs in on the line of the number displayeda connection to a Wrong subscribers line is completed. "From eral character described, inwhich the troubles pointed; out cannot occur. This is 'aecom plished providing a, register indiyidual to each] cord circuit for recording the number 0f mpulses 111 each d g tand for then transfer-ring the registered digit after each series, of impulses to an dleregister set Which has by this time been seized by thje register selector. .By this arrangement thejsecond digit can" be dialled asisoon as the trunkis seized,

andi rhile the registerselector is hunting for an idle register set, so thlatthe occurrence of v,theforegoing it will plainly be seen that both 5 '7 .niutl latedcalls? and rong number calls occur asa resultofthe seconddigit being,

mutilated calls and wrong number calls,

resulting as above set fort, is made impossible.

Various other features Will be pointed out and 4, thereare shown by means of the usual circuit diagrams the apparatus and circuit connections thereof which are involved in a complete connection extendingfrom the automatic substation A, Fig: 1, to a manual substation A', Fig. 2. The apparatus indicated in Fig. l is located in an automatic exchange, while the apparatus indicated in F igs. 2, 3, and 4 is located in a manual exchange. Inasmuch as the automatic switching equipment itself and'the manual equip.- ment are both wellknown and ofthe'usual type, no detailed description of the mechanicalfeatures of this apparatus will be-given, except in so far as it is found convenient or necessary to do so in the explanation of the operation of the circuits.

Referring to Fig. 1, the substation A is one of a plurality of ordinary automatic substations terminating in V the automatic exchange previously referred to, and is provided with the usual talking equipment and ringer, and also with a, calling device of well known type which is indicated byithe reference character S, through the medium of which the subscriber controls the central of fice switches. Y

The line conductors 11 and 12 extend to the exchange where they'terminate in the line switch C, which may be briefly described as a rotary line switch whose movable termi nals or wipers have no normal position. and which'have movement in a forward direction only. The construction of a line switch of thistype is well known inthe art, and its function, also well understood, is toextend itsassociated line when calling to'an idle trunk line. In carrying out this object, a

- plurality of these individual line switches are given access to a group of trunklines extending to first selector switches. 1' One of the trunk lines to which the line switch C has access isshown in the drawing as extending toili i at

the first selector D, whichis a vertical; and rotary selector of the well'lniown Strowger type; 'In a inulti-ofiice system of thekind herein contemplated the firstselec'to'r switches are usually known as office selectors and the selector D in common with a plurality of similar selectors'has access to a plurality of groups of trunk lines, each of which groups may extend to a diiferent oifice or exchange in. the system. Some of these groups of trunk lines may extend to automatic exchanges, while othergroups may extend to manual exchanges] A trunk line in one ofthe lattergroups is shown in the drawing, and comprises therepeater E and the trunk line conductors 1 and 181, which extend to the manual ex change in question and there terminate in the plug ending cord circuit 0, Fig. 2. The

cord circuit 0 is one of a plurality of similar cord circuits at a B operators position in the change.- Oneof these lines is the line of substation A", which with its associated line equipment is shown at the right of Fig. 2.

The repeater E is an automatic impulse repeater of the general type in common use, and in addition to repeating operating impulses to the distant manual exchange, provides holding "circuits for the automatic switches, and thus renders it unnecessary to use'more than two conductors for the interoffice trunk line. V

- F min the foregoing it will be understood thattheoperation of an office selector, such as the selector D, in response to thecallin of'the first digit in the telephone. number of a line in the manual exchange, will result in extending the connection from the line of the calling automatic subscriber to an idle plug ending'cord circuit in the manual exchange. In order to take care of the remaining digits in the numbers there is provided for each B operators position a plurality of register sets as hereinbefore stated, each set being capable of registering allthedigits in a telephone number, with the exception, of course, of the first digit which controlsthe ofiice selector in the automatic exchange. In addition, each cord circuit is provided with a common regis- 'tering device, orrelay group, which is capable of receiving a series of digits and oftransfe'rring them to the registers of a selected register set. Each cord circuit -is of"course also prov ded with a register selector which.

maybe engaged in hunting for a register set during the time in which a digit is being received.

In Fig. 3 have shown-a relay group and a register selector C, both of which: are individual to the cord circuit 0. :In Fig. 4 l have shown one of the re 'ister sets'accessible to the registerselect-or a, and also a comsecution' control switch CCS for displaying registered numbers one ata time.

The relay gro'up'RG, Fig.3, comprises a plurality of relays for recording the number of impulses in each digit and for transferring the digit after each' series of impulsesi to thecord circuit Fig. 2, and which has access to the register set shown inthe drawing, and also to the other register sets which areprovided at this. particular B operators position inlwhich the. cord circuit'O termi- I nates. 1 Line s'witch C. is ofwell known construction andfuncti-on and onthisaccou'nt the's'lowacting'release relay 51. Upon en;

ergizing, the latter relay prepares the ci'r working contact of armature 63 and the said armature, conductor 64, bank contact 31, test wiper 26,'armature l7 and its working contact, winding of the switching relay 18;, and the winding of the: stepping magnet 15 to battery. It is understood that the above holding circuit is completed before the slow acting relay 14. has had time to deenergize. In addition to maintaining the switching relay energized, the holding circuit also serves to provide ground to; the multiples of test contact 31 and also to the multiple test contacts in which/the private normal conductor 28' terminates in the banks of the connectors which have access to the line of substation A, thereby guarding the connection against intrusion in the customary manner. 1 5

' The calling subscriber may now operate his calling device S in accordance with the first digit of the desired number. Two interruptions are thereby produced in the circuit of the line relay 50, and the said relay is accord.- i'ngly twice deenergized momentarily, transmitting at each deenergization an impulse of current through the slow actingseries relay 52 and the vertical magnet 56 to battery. By the operation of the vertical magnet the selector shaft is raised two steps, whereupon the wipers 70-72, inclusive, will be standing opposite the level of bank contacts in which are terminated the trunk lines extending to the manual exchange. 'The slow acting relay 52 is energized in series with the vertical magnet, retaining the armature attracted throughout the vertical movement of the switch, and upon the closure of the vertical off normal springs 59 completes a circuit for the stepping relay 53. Upon energizing, re-

' lay 53 prepares a circuit for the rotarymag- 'net 5e at its lower armature and at its upper "armature establishes a locking circuit for 1 itself. "At the end of the Vertical movement of the switch the slow acting relay 52 is deenergized and closes the circuit of the rotary magnet, which is thereupon energized toad Vance the wipers 7072, inclusive, into *engagement with the firstset of bank contacts in the level opposite whichtheyfwere raised.

The rotary magnet54 also breaks the locking circuit of the stepping relay 53 which accordingly deenergizes and breaks the Jcircuit of the rotary magnet, which thereupon deenergizes also and again closes 1ts' nterrupter contact.

The 7 operation now depends upon whether the trunk line with which the wipers have connected is busy or is not busy. If this trunk line is-busy the test contact associatedtherej with will be grounded and the stepping ret ainrelays 5'5 and 13 ener ized lay 53 willbe energized over a circuit which extends byway of the test wiper 71, armature 61 and its resting contact, oii normal springs 59,interru'pter contact'of the'rotary magnet, and the winding of the stepping relay 53 to battery; The steppin relay will therefore again close the circuit oi the rotary magnet5twhichwill operateto rotate the switch, wipers into engagement with thenext set ofbank cohtactslj Thls operation in which the stepping relay and the rotarymagnet are alternately energized and deenergized will continue as long as the test wiper 71 continues to engage grounded or busy test contacts. ,In the present case it willbe assumed that the trunk shown in the drawings is the first idle trunk line, and when therefore the test wiper 71 arrives at test contact 74 and the rotary magnet is deenergized, the stepping relay 53 will not again be operated, but instead the switching relay -55,-which heretofore has been short-circuited, will be energized by current flowing over the following path: Grounded conductor 64, winding of the switching relay 55, oii-normal' springs 59, interrupter contact of the rotary magnet 54;, and the winding of the stepping relay 53 to battery. Owing to the high resistance of the switching relay 55, stepping relay 53 is not operated; Upon energizing, relay 55 disconnects the incoming line conductors from the windings of the line relay 50 and extends them by way of armatures and 62 and their working contacts, wipers and 72, bank contacts 73 and 75, trunk conductors 76 and 78, and normally closed contacts of the reversing relay 100 to the upper and lower windings oft-he line relay 101 of the repeater E. WVhen the line isextended to the repeater as above explained the line relay 101 is energized and closes the circuit of the slow acting release relay 102. Upon energizjoins the previously described holding circurtv extending back to the line switch-C.

The above described circuit serves to main- 7 g 7 throughout the duration of the connect on. In addition to closing the holding circuit for the automatic switches C and D, the relay 102 of the repeater E prepares a circuit'at its armature- 115 for: the slow acting relay 103, closes a circuitjatits armature 11 1 which causes the energization of slow'-to-energize relay 104, and its armature113 comp'letcs a circuit for energizing line relay 202 of the cord circuit over the following path: from ground byway of normally closed springs controlled by -armaturellS of s low-tdenergize relaylO, working contact of armaturev gizing 113 and said armature, conductor 130, upper lefthand winding oftlie repeating coil, Fig. 2', normally closed-springs controlled by arm' ature-214', and upper Winding of line relay 202 to battery. The line relay, upon energizing,

coinpletesa circuitat armature 218 tor enerter relay at arinatures 222 connects ground tothe lower winding of the line relay. By this time, slo'W-to-energize relay 1 04in the repeater E is" coinpletely'energized and saidrelay at armature 120 and its. worxing contact connects ground toreleasetrunk con'dnc-' tor 'T'Z for a purpose which will be explained hereinafter, and at armature 1 18, relay 104" hand Winding of the'iinpedance coil 106, norinally'closed springscontrolled-by armature 108, lower windingof polarized relay 105,

resting contact of armature 116 and saidarniature,'armature118 and its worklngcontact, and thence over-the previously traced circuit to the upper winding of the line relay to battery. Relay104 at armature 121, also closed" a. circuit for. the upper polarizing winding of relay 105. Polarized relay 105, however, does not now energize becausefthe current flow through its lower Winding is in the Wrong direction. 1

hen the calling line is extendedto the line relay 202 as above explained, said relay energizes and at armatures 216 and 217 opens the circuit of the impulsing conductors 260 and 261, and at armature 218' completesaclrcuit for energizing'relay 203 a's preyiously explained. Relay 203, upon energizing,

prepares the ini ulsi'n circuit to irnnulsin L l 7 L b conductors 260 and 261 at armatures 219 and 220,- at armature 222 and ltsworkingi contact connects ground to the lower Winding. of the line relay 202, and at armature 224 and its we hing contact prepares a'circuit' for relay201. i

In addition to the ioregoi-n-g,relay 203pat its armatures 221 and 22-3 prepares theoperating and testing'circuits for the register selector switch C shown in Fig. '3. A- circu it now extends to the switching relay 204 and vthe steppingmagnet 350 inser-ies as follows: from ground at armature 2241 and its working Contact; armature 235 and it's-rest ing oontact, ar1na-';ure 241 and its-resting z co iitflCli, winding; of 'switehingrelay-1 204,; armature 238 audits resting contact; resting pends upon Whether slow to release relay 208and-the lzit-f contact. of "armature.- 240- and said arniature,

conductor 266, interrupter springs-of, the

stepping magnet 350, and winding-0t said magnet to battery. The operation now dethe register 'set With which the Wipers of the line switch: are-in connection: is busy or isnot busy. If this register set is busy, the test contact such as 346, associated Willi-be short circuitec by Way of armatures 226'and 221,: and the stepping magnet 35.0 which interrupts its own circuit, Willfoper'ate as a buzzer to advance. the switch Wipers 33 5 to 340, inclusive, step-by-stepj in therewith will have a ground 7 potential upon it, the switching relay. 204' search ot an icle'regist-er This opera tlon Will continue as long as the: te'stwvrper 340 continues to engageground'ed' or busy test contacts; Howeyer', We'niay' assume that in the present case the-register set shown in Fig. 4, is idle, and the-test contact 346 there'- fore is' not grounded, and-therefore no rotation of 'the-lineswitch C will take place.

The switching relay 204' is at once ener.

gized over the above traced circuit, and said relay at; armature 225 opens a point in the circuit of busy relay 210 so thatthe busy relay will not energize when ground is connected to conductor 268. itsworking. contact, relay 204 connects ground to the release;.-trunk conductor 265 At armature 226 and" therebyrendering the" register set shown in Fig. 4,; busy' to other .zregister selectors such as -C which have access thereto,-ancl at arma cur c1227 and its Working.contact, relay 204 prepares a point inthe circuit for energizing relays 205' .nd 208 and the call lamp. CL. FWhen the register selector C seizes" the, registerset in Fig. 4, it Will be remembered that the switchingv relay 204 of the cord-circuit O connects ground to bankcontact- 346, .in order to ren-der'the register set shown iii-Fig.

4 busy'to o-ther register selectors. Then the register set is seized and ground is connectedt-o bank contact 346 relay 406 18 energized and said relay at armature 432 prepares a locking circuit for relay 407; and at armature 431 closes circuit for energizing relay 400 of the first register lt-Fasfolloivsz from ground by way oi Working con-tact efa niature "431 and said armature, armature '116 and its resting contact of the transfer relay 7050f the register E armature 61 6- and its resting contacfiot transfer relay 605. of. register 1%,

armature 5-16 and its restingcontact of the transfer relay 505:o1' the reg ster B arnia-' ture' "416 and its resting contact. of; transter relay 405 of tlie negiste r'ltkand winding. relay 400 to battery, Relay 400 is energized over: the above'traced circuit at armatures412 to 415, inclusive, prepares the circuitsfor the storage relays 401 to 404, in clus'ive,fiof the register Due to the operation of relay 400 the register; R is new 3 in;

condition t-o-receiVe the? digit designation 2 which is being or has been dialled upon the relay group shown in Fig.3. I

The ceiling subscriber may continue dialling even though the register selector has not selected an idle register set, or in other words the apparatus is ready for the receipt of im pulses corresponding to the second digit of the local number of the called line in the a manual exchange at any time after the seizure line relay 202 of'theco rd circuit 0. Each time line relay 202 falls back an impulse is transmitted over conductors 260 and 261, The grounded impulsesover the conductor 261 maintains the slow acting relay 300 energized for the durationof the series of impulses and the latter relay maintains the circuit of slow to release relay 301 closed fora slightly longer period for the purpose described hereinafter; Relay 301, upon :en ergizing, at armature 309 and its Working contact grounds the common conductor 334.

The relays 302, 303, 304, 305 and 306 of the relaygroup RG are two step relays and said relays operate only their armatures 311, 316,

320, 325, 330, respectively, on first step; When ground is connected to conductor 260 for the first impulse, a circuit for energizing relay 302 in its first step may be traced as follows: from ground by way of the working contact of armature 220 and said armature, resting contact of armature 217 and said armature, conductor 260, armature 319 and its resting contact, armature 315 and its resting contact, armature 310 and its resting. contact, and upper winding of relay 302 to battery. Relay 302 energizes over the above traced circuit andcloses only the working contact of armature 311. l/Vhen ground is removed from the impulse conductor 260 at the end of the first impulse a circuit may be traced for completely energizing relay 302 as follows: from grounded conductor 334, armature 321 and its resting contact, armature 311 and its working contact, and through the lower and upper windings of relay 302 to battery. Relay 302, upon completely energizing, transfers the impulse conductor to the second counting relay, or relay 303. The next time the impulse conductor 260 is grounded relay 303 operates in its first step and closes only the 'armature316 and when the ground is removed from the impulse conductor 260, relay 303 operates in its second step to transfer the impulse conductor 260 to the third counting relay, or relay 304. The circuits for completely energizing relay 303 may be traced as follows :from grounded contact, and through the lower and upper vwindings of relay 303 to battery. lVhen ground is connectedto impulse conductor 260 for the third impulse, relay 304 energizes in its first step to close its armature 320. When ground is removed from impulse conductor 260 at the the end of the third impulse, relay 304 energizes in its second step over the following circuit: from grounded conductor 334, arma ture 332 and its resting contact, armature 320 and its working contact, and through the lower and upper windings of relay 304 to battery. Relay 304 at armature 319 transfers the impulse conductor 260 to the fourth counting relay or relay 305, and at armature 321 opens the locking circuit of the first counting relay 302 thereby causing saidrelay todeenergize. At the end ofthe third impulse only relays 303 and 304' are energized and said relays remain in energized position until ground is removed from conductor 334 at the end of the digit as willvbe described hereinafter.

It has previously been explained how the relays 300and 301 are maintained energized for the duration of the impulses for each digit and therefore shortly after the last impulse has been received "slow to release relay 300 deenergizes. Relay 301 beingalso a slow-acting relay maintains. its armatures 308 and 309 closed for a short interval after its circuit is opened and during such time a circuit may be traced for transferring the stored designationof the relay group RG to the register set B Fig. 4. The circuit for transferring such designation may be tracedas follows: from ground, armature 307 and its resting contact, working contact of armature 308 and said armature, conductor 263, armature 225 and its working contact, conductor 262, armature? 318 and its working contact, armature 333 and its resting contact, wiper 337 of' the register selector C, bank contact 343, conductor 452, Fig. 4, Work ing contact of armature 414 and said armature, and winding of relay 402 to battery.

Relay 402, upon energizing, closes at armature 419 a locking circuit for itself which in-' eludes the Winding of the register R and ground at armature 431. Transfer relay 405 is not energized at this time because said relay is short circuited from ground on conductor 452. Relay 402 at armatures 420 and 421 prepares a circuit for lighting certain of the indicating lamps at the operators position.

Shortly after relay 300 deenergizes, relay transfer relay 405 of 301 also deenergizes and at armature 309 the latter relay opens the locking circuit of relays 303 and 304 whereupon said relays deenergize. At armature 308 relay 3011's moves ground from the conductor 452 Fig.

4, therebyremoving the short circuit from around the'tranfcr relay 405. Transfer relay405 nowenergizes over the following circuit: from ground, Working Contact of armature 431 and said armature, Winding of relay 405, armature 419and its Working contact, and winding of relay 402 to battery. Transfer relay 405, upon energizing, at armature 4'16 and its resting contact opens the cireuitpf relay 400 of the register B and at the same arniature' and its working contact closes a circuit for the relay 500 of the register Relay 400 deenergizes and disconnects the storage relays of the register R from theconductors 450 to 453, inclusive. '-h'e circuit for energizing relay 500 of the register may be traced as follows: ground, working, contact of armature 431 and S3161,

armature, armature? 16 and its resting con tact, armature 616 and'its resting contact, armature 51 6 and its resting contact, armaf ture 416 and its workingcontact, and vindingof relay 5 00to battery. Relay 500 of'th register corresponds to the relay 400in the register R? and therefore relay 500,- upon Y bank contact 343,- to conductor 452. hen

efiiergizing, at arinatures 512 to 51 5 inclusive, prepares the circu ts for the storage relays 501 to' 504 inclusive, which relays'corresp'ond in every detail to the storage relays 401 to.

404 inclusive, of the register R Theflreg- ,ister R is' now in condition to receive the digit designations-of thethird digit.

When the third digit, or the digit 4, is

dialled, relays 3001to 304, inclusiye, are oper- Q ated in the samemanneras previously ex plained. At the startlof the fourth impulse, however, relay305 is energized. in itsvfirst step and at ar1nature'325 it prepares a lock ing circuit foritself which includes the armature 321 and the grounded conductor 334'. At the end of the fourth impulse ground is removed from conduct0r"260 and relay 305 completely energizes over the above mentioned locking circuit. At armature 3224 relay 305 transfers the impulsing circuit to rea lay 306and atarinature 327 prepares a circuit for grounding conductor 451. I v

. R'Vhen'relay 300' deenergizes,after tliecessation of impulses, groundis connected mo- Y nientarily to conductors 451 and 452 as fol' 50 i lows: ground by Way of armature 307 and its, resting contact, workingv contact of arn1acare 308 and said armature, conductor 263", armature 225 and its working conta'ct, cond uotor 262,. to armatures 3 14 and 318 Where the-circuit divides, one branch extending by way of armature 314 and its'resting contact, armature 327- andits working contact, Wiper 336, bank contact 342, to'conductor 1d 451;the other branch extending by wa'y of armature 318 and-its Workingcontact, armature 333 audits restnig contact, Wiper 337,.

ground is connected f to conductor 451 a: circuit inay he t'r'aced'throng-1ithe,Workingcon;- tact of armature 513 to" relay 503 of regist r" R and said relaywill thereupon energize'and lock up in'the same manner as explained for Although the-relays of register R are not their iarina'tures forthe indicatinglainps in i the same manner as explained for register R shown the'circuits will be re'adilyunderstood a in view' of the showing of register R :"lvhen relay 3'01'deenergizes after the last impulse, counting relays303, 304and 305 deenergizel? Ground is alsoremoved from conductors'45l and 452 whereupon a circuit is closed for the transfer relay 505 of the register R rrom groundoat armature431, Winding of relay 505 through armatures 519 and 522,I Which correspond to 'armatures such as armatures 41-9 and; 422, andthrough the Winding of, relays 502and503in; parallel to battery. Relays 502, 503 and 505 are maintained energized overthe abovez' traced" circuit. .Relay 505, upon energizing, at arrnature 516 and its resting contact-opens the circuit of relay 500"Which-fdeenergizes, and at its Working contactcloses an ener izing cir-i cuit for the relay 6000f the register 1 ,,Wl161'G" upon the latter relay energizesjand prepares the register E forfstoringthe digit designa 1 tion ofthe fourth digit to be dialled. 7 I v, TWhen the fourth 'fdi'git. is dial1ed,-:0r' the digit 5, relays 300 to 305 energize in the same manner .as previously. descrihedu When a ground is connected to'conductor 260 at the start of the fifth'i1fipL1lS6,,I6l1y306 lS energized in its first'step over a circuit including the armatures324 and 319-andthe conductor 260.- Relay 306, upon energi'zing-in its first step, prepares atarmature330 a locking ciriit for itself When ground is removed from theimpulse conductorz260, at the end of a fifth impulse,- relay 306 becomes fully energized over a circuit incl udi11gz a grounded conductor 334, armature 330an'd the lower andupper Windingsof relay 306. 1 Relay 306, u'pon fully energizing, prepares at armature v 329 the inipulsiiigci rcu-it to the: first counting relay, or. relay 302, at armature 331 opens the i.

locking circuit of relay 303 Whereuponsaidrelay deenergizes, and at armature 332 opensthe locking circuit of-relay- 304 whereupon said rel aydeenergizes. At armature 333 relay 306 prepares acircuit for grounding one or more of the conductors extending'tothe registersetf V Y J henrelay 3.00 deenergizes afterthe fourth digit ground isnronientarily connectedto eon ductor'451 by Wayof conductor 263 ,conductor 262,- a rm ature. 318 armature 327,1 Wiper 336, and bank contact .342 to conductor, 451. A

to deenergize. Relay 301 -;at armature 308 also removes ground from v conductor 451 whereupon transfer relay 605, which heretofore has been short circuited, is energized. Relays 603 and 605'are maintained energized over a circuit similar to the locking circuit of relays 402 and 405 describedfor register R Relay 605, upon energizing, at armature 616 and its resting contact. opens thecircuit of relay 600 which deenerg'izes and at its work ing contact closes a circuit for energizing relay 7 00 of the register R Relay 7 00 of the register R energizes and at armatures 712 to 715, inclusive, prepares the register Rt for receipt of the, next digit designation.

When the last digit, or the digit6, of the wanted s'ubscribers number is .dialled, relays 300 to 306 energize in the'same manner as previouslyexplained; Itwill be remembered that relays 305 and 306 :were the only relaysin the relay group R which were in operated position after the end of the fifth impulse. When ground is connected to the impulse conductor'260: at the start of the sixth impulse relay 302 is energized in its first step. l/Vhen ground is removed from impulse conductor 260 after the end of the sixth impulse a circuit may be traced from the grounded conductor334 by way of either armature 332 or armature 321, armature 311 and its working contact, and through the lower and upper windings of relay 302 to battery. Relay 302, upon energizing in its second step, at armature 310 and its working contact transfers the impulse conductor to the, second counting relay, or relay 303. .At armature 312 and its working contact relay 302 prepares a locking circuit for counting relay 304, and at'armature 312 and its resting contact opens one of the locking-circuits for the counting relay 305. The latter relay, however, does not deenergize because it remains locked up through armature 317 and its resting contact. At armature 313 relay 302 prepares a locking circuit for the relay 303, and at armature 314 and its working contact prepares a circuit for grounding the conductor 453 of the register set.

Relay 300, upon deenergizing shortly after the end of the sixth impulse, closes at armature 307 a circuit for momentarily grounding the-conductors 451 and 453 of the register set. It will be remembered that relays 302,-

305 and 306 of the relay groups'RG are the 7 only relays in operated -posi tion,and there-- fore when conductor 262 IS momentraily grounded as previously explained, ground is connected by way of armature 314 and its working contact, armature 323 and its restmg contact, wiper 338, bank contact 344, to conductor 453; and from ground through armature 318 and its resting contact, armature 327 and its working contact, wiper 336, bank contact 342, to vconductor 451.

When conductors 451 and 453 are mo mentarily grounded, relays 703 and 701 are energized by way of armatures 713 and 715, respectively, in the same manner as previously explained for the corresponding relays of the register R Relays 701 and 7 03 upon energizing, close circuits at their respective armatures for controlling the indicating lamp at register R I Relay 301, upon deenergizing, at armature 309 removes ground from conductor 334 thereby deenergizing relays 302, 305 and 306 of the relay group RG. At armature 308 relay 301disconnects ground from conductors 451 and 453 thereby permitting transfer relay 705 which heretofore'has been short circuited to energize. The circuit for energizin relay 705 'may be traced as follows: 'rom grounded armature 431 through the winding of relay 705 and the windings of relays701 and 7 03 to battery. Transfer'relay 705', upon energizing, opens. at .armature- "('16 and its resting contact thecircuit ofrelay 700 of the register R and at its working contact closes a circuit from ground, byway of armature 431 for energizing the relay 408. Re-

lay 408energizing, at armature 436 and its,

working contact, completes an energizing circuit for the start relay 409 of the consecution control switch COS, at armature 437 and its working contact prepares a circuit for the lamp relay 407, and atits resting contact removes: ground from the bank contact 447 which corresponds to the register set shown in Fig.4. At armature 438 and its working contact, relay 408 completes a circuit for lighting the pilot lamp PL thereby notifying the operator that a call has been registered on the associated register set.

Conductor 445may be considered as a test conductor and extends to the first contact of the bank in the censecution control switch 003, since the register set shown is assumed to be the first register set at the'position. The other test conductors directly above conductor 445 are of course associated with the other register sets at the same position and are all normally connected to ground through armatures such as armatures 437 of relay 408.

Assuming that no other call is being shown on the indicating device just at the present time, the consecution control switch CCS is immediately operated to switch the reglstered call over onto the indicating device. The operation is as follows: when relay 409 energizes, it connects up the wiper 446 by 7 ingiinoperative, v line relay'at armature 441'. I

slow acting, however, and before it has had time to fall back, relay 407 is energizedovei'i the following circuit; from ground, byway of armature .443. andfits working contact,-. v working contacts ot'arma-ture 442 and'saidf T armature, armature 440 and its workingg'contact, wiper; 446, bank contact44'7, armature 43? and its working, contact, andzthe winding otrelayi407 to battery. Upon'energizingqe lay 407' locks itself to the groundedfarmm ture 432 at'itsarmature 435,

connects ground to conductor ,445 .for:- maintaining switching relay 410 energized after the line relay 411 becomesdeenergized'. Itelays 407' and 408 are now both energized, and the 'c'oiisecution control: switch isv in operated,

V wiper in engagement 411.. Uponenergizing, the latter relay closes ground has beenremoved frombank contact 449 by the energization of relay 408 no rota-I j Instead, the switching relay 410', which is of'highiresi'stance, isat once energizedlin series with the stepping magnet 447, thela-tter remainand opens the" circuit oi the y The line relayis tion of the switch will'take place;

This operation position (switching relayenerg i'zed) with its with bank contact 447 which corresponds to the first register set or the register set hown in Fig. 4. Other calls may be registeredon the other register sets at anytime now andwhen registration is completed, the lamps, such as pilot lamp 1 L,

corresponding to the. register setsfin use will be lighted, butthis'has no efiection the consecutionfcontrol switch CCS, which nakesino further movement until the call on the first register set has been disposed of. h

Relay407 is the relay wh ch switches over the registered call to the lamps; of theindicat-V 'in-g deviceand the. manner, in whi'c'h this is done storage relay erated, it prepared cui-t for-indicator lamp will. now be pointed. out, When the 402, of the register'R vWas o pat its armature 421 a C11- mature 428 and'tsresting contact, lamp] #3 to-battery. WVhen the. relays 502 and 503 of the register B were. operated, a circuit. was #4 of the reglster R prepared for-thelamp Thi-scircuitextends. from the grounded armature 433, armature 518:. and itsresting con- 1 {Themanner 1n #3 oi the register R extending by way of grounded armature 433 421 and itsworking-contact which corresponds to armature 418 of the register R armature '521 and its working contact which-corresponds to the armature 7 4210f the register Rflarnhature 524 and its working a contact" which corresponds to the armature 424' of the register Rfiflimp #4 to- I battery. The operated relays inthe registers R1 and R 'clo'se circuits, from grounded arx n ature433 tothe #1 5 lamp "of "the: register R and-theitfi lamp of-lthe register R 'inj a similar manner; Pherefore, when IQlfLY'OT-COII:

nects ground co-armature '433 the number :3

indicatinglamp'of register R the #4 indi-- eating lamp of the register R the number 5 indicatinglamp ot-the register and the ,n nnber 6 indicating lamp of the register-R "llght to inform the'operator that'the called I liners #345 lainpCLin the; cord circuitO-which may be whiclrtheoperator handles the call-thusdisplayed before her will now be considered? Whenj re'lay 407 pulls up'and closes a circuit for displayingtheiregisteredt number 'to' the operator, it; also closes; at its arniature434 arcir'cuit for the trunlrcr'call ing contact of armature 227 ancl said armature, winding of'rel ay'208, resting contactof armature 2'34 and- .said armature," armature 2291a'nd its resting contact,call-"lamp GIi-to' battery. the closure "of the above! cir curt, call lamp CL which is-individual to the cord circuit -Q,-'is lighted simultaneously with the callindicating lamps, thus enabling the operator to know 'Which one of her cord circuits. is being used; by the automatic subscriber Whose wanted numberis at this par-V 7 ticu'lai'" time being shown Ion the indicating "lamps. Simultaneously withv thelighting f of thecall lamp. CL,'rel ays 208"a'nd,205 are energized, the latter relay being energized :in

parallel with relay 2081b'y way of armatiu'e' 231* and its 'resting contact; Relay 205,

upon energizing, I preparesat armatures; 228' the circuit forms busy relay 10; Relay 208," upon energizing, opens the circuit; of

supervisory lamp SL at armature 236;.

7 Having observed the #3456 and knowing by the lighting of the lamp CL that the cord circuit 0 is the one'in' use, the operator will i test the multiple jack-of the line number 3456'with the'tip of her; plug inthe usual manner in order to find out whether or not the line is busy. 1

Ifthe'line is found tobe in use,theoperator will hear the well' known busy cliclcin herre'celverwhen 'she'tests the called line and will Itheret'o-re operate the busy key -By the operation of the busy key K; ground is I connected to common conductor 252 which ex tends by way o far1naturej228' and'its working contact, resting contactof armature 244and said armature, "and; winding of r'elay 210 to battery. v Relay- 210 energizes over the above traced circuit and. at. armature "239 .and its working contact connects. the busy to-ne to the upper left hand winding of the repeatingcoil and to the conductor 130,thereby transmitting the busy tone to, the calling sub In addition to the above, relay 210 at armagizing, at-arn'iature 436; opens-the circuit ofrelay 409 whereupon sald relay deenergizes,

ture 240 opens the circuit of the stepping magnet'350 of the register selector; C and also opens the circuitofthe switching relay 204 at armature's' 240 and 241 whereuponthe latter relay deenergizes. .Rela'y---2O4, upon 'deenergizingat armature 227" opens the C1I' cuit ofrelays205, 208, and call lampC L IA t armature 225 relay 204 prepares a ClI'CllIlhfQI the busy relay 210 which will bee cplamed more fully hereinafter. V In addition to 'the above, relay 204 at armature 226 disconnectsground from release trunk conductor265 therebycausing relay 406' F1g. 4 to deenergize. Relay 406, upon deenerg z ng atiarniature 432 opens the circuit'of relays "Zvand 410 whereupon said relays deenergize. At

armature43l, relay 406 opens the circuit of;

the operated storage relays 1 in the registers R to R4, inclusive, and the relay or. 408..'

Relay 40?, upon deenergizing, at'arrnature 433 opens the circuit to all'of thenid cating lamps of the registers R to Rf, nclus ve, and at armature 434'd1sconnects ground: trorn bank contact 345. Relay 40S, upon-deener and at armature 437 again'applies ground to the bank contacts 447 in the COIISGCLLUOILCOQ- trol switch CGS. In addition, relay 408 fat armature. 438 opensthe circuit of the p lot lamp PL. All ofthe relays and apparatus in the register set shown'in Fig. 4 has been re: turned to normalposition in readiness to;re-. ceive the digits of the next call.

Having described how the ca li g Subscriber receives the busy toneand how the register I set is released responsive to the operation or the busy key a description will now be given explainin how the connection is completed to the called subscriber when the operator finds the line of the called subscriber. idle. After testing, it the line isidle the operator will at once insert the-plug P into the pick of the wantedline which inthe present place is the jack J; As soon as theplug 15 inserted in the lack J acircuit is completed for the sleeve relay 211 in serieswith cut ofi' relay 250 of r the called line; and the latter relay is energizedto clearthe line ofitsrnorinal battery and groundconnect1ons 1nthe usual manner.

Relay 211 is energized also and at armature relay2065 connects ground Wind ng offline relay 202; at armatures 2 32 prepares a c rcuit for 'the jsupe'rvisory lamp}' is con-" tact-opens the circuit of relay 205 which de- 243 con1p'letesa circuit for, energizing relay ringing circuit is established over which ringingcurrent from thegeneratorGEN. is pro-7,

jected intermittently to signal the called sub scriber'.

In addition to the function described, re-

lay 206'energizes over the above traced circuitands'aid relay at armature 229 opens the, c rcuit of; the call lamp CL and, -relayl 208 which thereupon ,d'eenergize; 'At' armature to the low er L, and'at armature 231 and its resting energizesand opens the circuitto the busy reay,

At armature 231 and 'itslworkin'jg con tact relay 206 closes a circuit for relayf207;

Relay 207. is'now energized over-thefollowin'g "circuit from 'groiu'id by way. of armature 434 and 1ts wor'lnng'coi' ta'ct', bank contact 345', wiper 339, c0ndu'ctor264, Working contact of armature 227. andg'said armature. ar-

inature 231 and its working contact, working contact of arinat1ire'223' H V and said armature, through normally closed springs controlled.-

byflarm'ature 235, and; winding of relay-207 tobatte 'r'y At armature 233irelay 207 opens the c rcuit extend ng to the stepping magnet 350 of the register selectorCf thereby also ir'cuit of relay 204 '7 opening theenergizing' c which 'ideenergizesl I 207 opens) a further point'in the circuit of relay 208 andprep'ares a circuit forfflashing the call lamp incase-the operatorrenioves the plug P 'froinjthejack J before the calling man has hung up, and at armature 235 closes a, locking 'circuit' for'itselfin' place of its circuit.) Relay i204,

original energizingupon deenergi zing, removes ground'froin release trunk conductor 265 thereby releasing the apparatus'shown in inthe same manner aspreviously described; 7

' Havingfegiplained how the'connection has been completed to the called substation A; and how ringing current is'projected out over the called line to signal the subscriber, a description will now be given of the operations which take place-when the called subscriber at substation A answers. 'During the ringing operation atone is induced in the left hand winding of the repeating coil-of the cord circuit O by reason of the fact that the ringing circuit includes the lower right hand winding of the repeating coil,an d this tone is audible to the callingsubscriberwho is thus advised that the signalling operation is proceeding satisfactorily. I The;ring included in the ringing circuit, andfwhen the cut offv relay- 209 B I called subscriber answers, this relay pulls called station is now supplied with talking and locks itself'in series with thesleeve relay 211. Relay 209 also breaks the ringing circuit at armature 237, and at the working con tact of the same armature finally completes the talking circuit. The transmitter at the current through the right hand windings of the repeating coiland through the upper and lower windings of battery feed relay 200. Relay 200 energizes in the first instant through its lower winding alone, since the upper winding is normally short circuited in order to keep it out of the ringing circuit, but

when the .relay pulls up both its windings are 1 I inserted in the battery teed circuit. In energized position, relay'200 closes a circuit for the reversing relay 201. Upon energizing,

relay 201 reverses the trunk conductors 130 until and 131 as regards their connections with the windings of the line relay 202, and the direction ofcurrent flow in the trunk line is thus reversed. The direction ofz-current flow through the lowerwinding of the 'electroolarized relay at the repeaterE is'.there-. orereversed and this relay is now operated."

At armature 119 relay 105 completes a circuit forthe reversingrelay 100. The operation of relay 100 reverses the direction of current flow in the'cal'ling line. This operation may 'befused for operating a neter 'or for other similar purposes, and is provided in accord-' ance with standard practice although it is of no utility in theparticular system shown herein. t

The required connection havinggbeen established, the subscribers may now converse as desired. When the conversation is finished both subscriberswill' hang up their receivers,

, and the replacement of the receiver at the calling station A causes the automatic switches to be restored to normal. \Vhenthe receiver is replayed the circuit of the line relay 101 is broken, resulting in the deenergizationof this relay and also thedeenergization of the slow acting relay 102. I Line relay 101, on deener relay 103 and at'armature 114 and its working contact opens the .clrcuit of slow relay 104; At its resting contact of the same armature relay 102 substitutes a circuit for maintain- 'ing relay 104 energized over conductonli-Bl the plug P is withdrawn from the Jack J A short interval-after relay 102deenergizes, relay 103] also fdeenergizes Jand fat its armature "1 17 again connects ground to. the

- release trunk conductori? by way "of zi'armature and its working ic'ontac't towbusy the automatic exchange.

WVhen the bridge ductor's 130iand l3l is=broken at armaturellll line relay 202 is deenergize'd. Relay202, on deenergizing, opens theci-rcuit of sl'owfto release relay 203- a t armature .218 whereupon repeater E to the automatic switches in the across the trunk con-.

saidrelayydeenergizes. "Relay 203,.on 'de energizingopens the locking circuit of relay where'r'ipon the' latter relay deenerg zes. At armature-224 and its resting contact relay 203. closes a circuit for lighting the supervisory l'am'p'SL thereby indicating to the operator that the calling party has-replaced llis re: ceiver; At armature 224' and its working'contact; relay 203 also opens the circuit of the reversing relay 201.: i

207 at armature" 224$:and its workingncontact 'W-hen-the operator observes the lightedsupervisory jl amp SL she will remove the plug" of the cord circuit 0 from the'j arch and relays- 209 and 21 1 aredeenergizedand .re-

stored tonormal. At armature 243 r'elay2i1l I opens-the circuit of relay @206" whereupon the latter relay "deenergi-zes; 7 At armature 230 andaits working'contact,'-relay2061 removes a the ground-coiinectio1i which extended by way of lowerwinding of line relay 202, normal closed cont'acts controlled by armature 215 and lower letthandwinding:otrepeatin coilto trunk conductor 131 and over the previously traced circuit for maintaining relay104 energized. Relay; 104:,upon deenergizing, at armature 120 andits working contact disconnects ground fromthe release trunk conductor 77,, thereby removing the busy condition. All theapparatus has now been restored and is ready'for use in handling another call. j y r In case the 'operator' should accidentally w thdraw the plug fromthe j'ack'before the automatic subscriber has hung up his re 'ceiver, means is provided forflashing the call lamp CL to call her attention to the error. When a plug is withdrawn relays 206, 209uand 211 are deenergized, and since relay 207 is now in, energized position, the

calling-subscriber not having hung up his receiver, a circuit is completed for the call lamp CL which includes the interrupter I, and the lamp will be flashed to attract the attention .of the operator. If the operator remembers the jack from which the p'lug was withdrawn, she can rep'lug immediately, otherwise she will plug into a special jack '(not shown) which-connects with her headset so that she can talkto the calling party and ask him from.

what'num'ber he was disconnected Certain details of the system will now be explained which it was: not convenient to go into before, and the first-thing which will be considered is the-manner in which a call v ingisubscriber is given the busy signal if all the register sets are in use. It Will be remem bered that relays 300 .andBOl are energized during the transmission of impulsesfor each digit and that shortly afterthe last impulse of the second digit has been sent relay 300 deenerg'izes' and connects ground at armature 307 to conductor 263. If at this time the-register selector. Ci 7 has not yet seized an,

' idle register set, the switching relay 204k in the cord circuit 0 .Willnot be energized. A circuit may then be traced for operating the busy relay-210 of the cord circuit 0 as fol-' lows: from ground by way ofarmature 307.

and. its resting :contact, working contact of armature 308 and .said armature, conductor 263,.armature 225 'and its resting contact, resti-ngocontactof armature 244 and said armature, and winding of busy relay 210 to battery. Relay 210, upon energizing, at armature240 opens the circuit of the stepping magnet 350 of the register selector and. at armature 24l'and it's working contact closes a locking circuit for itself which in-' cludes the armature,2% so thatwhen relay 301, Fig. 8, deenergizes and removesgground fromconductor 268, the busy relay will be maintained in operated: position. :At armature239'and its working :contactrelay 210. connects-the busy tone to the trunk and the busy tone is tr'ansmittedto the-calling sub-o scriber in thewell known manner.

. The next thing to be considered is the novel circuit arrangement by means of which the B operator :by the simple expedient or" removing her plug'P; from thej-ack 254:, when she desires to leave her position,ma-y busy. the incoming trunks to her position. "When the operator removes her plug P from the jack 254 relay 248 deenergizes and at its armature closes a circuit for energizing relay 249.

7 Relay 249, upon energizing, connects ground to conductors such as. conductor -253. Vhen ground is connected to conductor 253 a circuit may be traced for energizing relaylOd of repeater E as follows: by way of the lower winding of line relay 202, normally closed busy to the switches in the change. i r

- Having described my. invention, what; I consider: to-be new-and desire; to have protectedby LettersPatent will becpointed out in the;appendedclaims. g

VVhatIclaim asmy invention is: I 7

Y1. In atelephone system,

automatic e;:-

a manual exchange and an automatic exchange, a trunk,

line accessible to automatic switches in the automatic exchange and terminating in a cord c rcuit at the manualexchancr a over said trunk line, a switch individual to said cord'circuit, means in said cord circuit ity of lfegister Setseach comprising "a seri s of. relay groups forv registering the digits 111 the;telephonenumbers of manual linescalled over the trunk l1ne,:a switch ndividual to said cord circuit, means in said cord circuit operated responsive tocthe seizure o'flsaid trunk line for causing said individual swi ch; to hunt for an idle one, of said: register. sets, and means in. the manual exchange for registering the first digit in the telephone num ber of the called lineduring the time said individual switch is hunting for an idle registerset. I

3. ,In a telephone system, a'manual exchange and an automatic exchange, a trunk line accessible to automatic switches in the automatic exchange and terminating in a cord circuit at the manual exchange, a plurality of register setsfeach comprising a series of relay groups for registering thedigits-in the telephonenumbers of manual linescalled over said trunk line,a switch;individual to said cordcircuit, means in said cord circuit operated responsive to the seizure of said trunk line for causingfsai'dindividual switch to hunt for an idle one of said register sets, a group of counting relays individual to said cord circuit for counting the impulses in the first digit ofthe called telephone number regardless of Whether said individual switch has selected an idle register setfor not, and

7 means operated after the first digit for transferring the first digit to the in the selected reg1ster.;

4 In a telephone system, a manual exnrst relay group pluralr ity of-register sets each comprisinga, series ofrrelay groups for registering. the digits in the telephone numbers of nanual' lines called automatic-exchange and terminating in av cord circuit at the mannual exchange, a plurality of register, sets :each comprisingaserljes of rela-ygroupslfor registeringitheldigits i first "digit of the. called itelephonellnuinber "trun k line for causing s'aid' individualis witch regardless of 'Whethersaid individual 1 switch has selected idle register set or not, and

means operated-afterthe 'fir st digit ior ,caus .'ing the busy tonetofbe transmitted {to the calling par ty in case said individual switch ,has not at such time selected an idle register set.

g 5,111 a telephonesystem, a manual exchange and an automatic exchange, a trunk line accessible to "automatic switches in the automatic exchangeiand terminating in a 7 icord circu-i t'at'the manual exchangd a .p'lurality of register csets'each comprising a series of relay groups for registering the digits in the telephone numbers-0f manual lines called over said trunk line, a switch in ;'d1v1dual to sa d cord c1rcu1t, meansfl1n said cordcircuit'operatedresponsive to the seizure- "of sald trunk line forcauslng said ndlvjidu'al 1 said cord circuit for counting the in-ip'i'ilse'sswitch to hunt foran idle one of said register sets, a group of countmg'relays indlvidual to in the first .digit of the called telephone number regardless of whether said individual switch has selected an idle register set or not, and means operated after the first digit for causing the busy tone, to be transmitted. to the calling party in casefall ofthercgister.

' sets are bu'sy,

6. In a telephone system, amanual ex change, trunk lines terminatinglincord circuits in said exchange, automatic substations:

having access .to said trunklines for calling the subscribers in the manualeirchange, a' plurality of register sets forregtlstering'theitelephone numbers of called manual stations,

automatic switching mechanisms' for connecting any cord clrcuitw th an Idle register set for transferring each digit to the selected register set aiterreceiptfthereof. V

a P r ityo regi t et 'i o reg te ngith 't 'p' o num r of call 5 1,jiau i af tet e y "busy 1 ja kcomm n t0 ts' ii .Qeri litsz b ---necting'her head-setjto sai'dgcord circuits, and

'meansjoperated'responsiveto th V V automaticswitching mechanisms {or connecting any cord circuit with an idle register set whenthe cored circuit is taken into use, a group of counting relays-individual to each cord circuit upon which successivedigits are rcounted'i'and are -the11,,transferred"tojthe ,the telephone numbers of.manual'linescalled over Saidtrunk fline,a switch individual tov .isa-id cord circuit, means in; said cord circuit operated responsive to the seizure {Of said rality of register sets iorvregisterin'g the-,tele

phone numbers calledmanual stations, automatic switchingmlechamsmsior connect group of relays individual to eachcordcir- CullTllPOIl whichfeach digit of the called .-numher-is temponarilystored,and means operated p ea'c'h'd' g'it. for transferring. the stored ,d'i glt' to these'lected Vreg'istenset.

fingfanyrordcircuit with an fidleiregister set when the-cord circuit it's-taken lnto use, a

' 9,111 -.a.'telephone jsystein,"a manual exchange, trunk lines termina'tingv in; cord circults ,ln sald exchange, automatic substations, having ja ':'cessjto,sa1d trunk lines for calling the subscribers in ,the manual exchange, a

plurality of .regiStersets f -r registering the 7 telephone numbers of called manual stations,

automatic .switchingi mechanisms .for connect ln'g any cord circuit w th an 1dle'register.,.set when the coridclrcuit 1s taken nto use, a group of counting relays individual to" each cord 0117011113 upon which each successive digitof the called number isftemporarily stored, and means operated after each digit for transterring the successivelystored digits to successive relay groups set, resp.ectively.

.110. a telephone system, manual exchangatrunklines" terminating in cord circults 1n ,sald exchange, automatic substations lhavirig access f'tosa'idtrunk lines to? calling the subscribers 1n the manualQeX ha-nge, a

plurality of register sets forregistering' the i of theflselec'ted register telephone numbers of called manualstat'i'ons, I

-necting any cord circuit with an idle regcircuit repeatedly operated responsive to the successive-d gits in thecal led number'for 'sucroups of said selected register set,

cessively controlling the setting of the relay when the cord ci-rcuit'is taken into use, and a register individual to each cord circuit "for receiving the digits of a calle'dfnuniber and ve'periatoris ,positionin a 'manufalexchange,

a relay in jea'ch trunk Cline at the automatic he disconnec- Y'tion 'Qf this ii qin sa d fi ick' when the .2 a t leph n sys m We condu t r 1- ;tru ikflines;extendinggfi om; an automatic ex: eh n and t rminatinginc0 3 circuits ata'n automatic switching mechanisms for con- 5 operator desires to :leave her position for closing acircuit over only oneofthe concluctors'of each of said trunksfor energizing saidrelays. U j, e

' '12; In a telephone system, a trunk line,'a

vice to the registerset as soon as receivedQf I e Ina telephone system, atrunk line, a" i stor'age set associated with said trunk line,

" g oup of counting relays individual to said storage set comprising aplurality of relay trunk line, means in said, relay groupffor counting thejnumber ofim'pul's'es in each successive digit of a called telephone number re-.

ceived over said trunk line, and means for transferring each digit from the relay group to the storage set as soon asreceived V e 14. In a telephone system, a trunk line, a

groups associated with said trunk line, a digit receiv ng devlcejmdividualto said trunk line, means for sendmg digits oversa1d trunkline to said receiving device, and means for transferring each d git from the receivmg device n the storage set" to successive relay groups] as soon as such digits are received. 15. In a telephone system, a trunk line, a register set comprising a plurality of relay groups associated with said trunk line, a

group of counting-relays individual to said trunk line, means, in said counting relay groups in eachstorage set, digit receiving device individual to each trunk line for registering digits transmitted: over said trunk 1 line, and means for transferring-each digit group for counting the number of impulses in each successive digit of a called telephone number received over the trunk. line, and means for transferring each d glt from the counting relay group to successive relay groupsin the register set as-soon as received: 16. In a telephone system, a plurality of trunk lines, a'plurality of stora-ge sets com-I mon to said trunk lines, a plurality of relay fromthe receiving device to successive. relay groups in any one of said storage sets-as soon as suchjdigits are received.

17. In a telephone system, av plurality of trunkrlines, a plurality'ofstorage sets com mon to said trunk lines, a plurality of relay groups in' each storage set,fa digit receiving device individual to each trunkline, means for. transferring each digit from the receivingdevice to successiverelay groups any one of said storage sets as soon as such digits are received,-and Ineansoperated after the first digit for causing thebusy tone to be transmitted lto the calling subscriber in case "all the storage sets are busy.

*18. Ina telephone system wherein the .digits'of calledtelephone numbers are stored -l onjstorage 'sets commonito apluralityfof trunk lines, means individual to each of said trunk lines; for receiving and temporarily v storing each digit "in a called telephone number, and eans for transferring each tempo'rarily stored digit toone of said-common "storage sets after receipt thereof. registerset associated with saidtrunklinaa digit receiving device in'diyidual-to and con trolled over *said trunk1line,and means for transferring each-digit from the receivingjdea 19. In a telephone system wherein the digits of called telephonenumbers are storedon istora'ge; sets common to a plurality of trunk lines, a group of counting relays individual ,to'each of saidl'tr'unk lines, and means con-" trolled by any one'of said counting relay groups for registering the number of impulses ineach successive digit ofthecalled number and for-transferring such registrations'to, one'ofsald common, storage sets afterlines, a groupof counting relays u'ponwhich successive digits are" temporarily stored, means for transferring [the temporarily stored" digit upon receipt thereof to "one of said common storage sets, and means operated after the first digit for causing the busy tone to be transmitted to the calling subscriber in,

case all the'storage'sets are busy.

22. In a telephone system wherein the digg- I its of called telephone numbers are'stored on storage sets common to a plurality of trunk lines, a single-digit set of counting relaysindividual to each of said trunk lines arranged f torespond successively to a. plurality. of digits in a called telephone number, and means for associating any counting relay set with any storage set in order to set said asso-H ciatedstorageset. 123. In af'telephone system, a trunk line terminating in acord circuit, meansv for seizing; said trunk line and for transmitting dlgltS thereto, a storage set,means associated..

with said trunk line for connecting said trunk line ith said storage set responsive to said seizure, and means whereby the first digit received on said trunkline after its seizure will be eventually stored in said storageset, even though it is sent tosaid trunk line be fore the connection is made' between the storage set and said trunk line.

24. In a telephonesy'stem, a line,a storage set for storingfdigits received over said line... means for associating, said set with said line to store a digit received thereover, and means whereby said digitis eventually stored in said storage, set even though-it is received over saidlline before said storage setis asses ciated therewith, said last means comprising l said storage sets with said device, means for successively registering a plurality of digits on said device, and means for transferring each of said digits from said device to the associated storage set as soon as received.

26. In a telephone system, a group of counting'relays, storage sets each comprising a plurality of relay groups accessible to said counting relay group, means for associatlng an idle one or" said storage sets with said said storage sets with said device, means for successively registering the digits of a calledtelephone number on said.

device to the associated storage set as soon as registered, a plurality of signal lamps operable in various combinations under 1 control of sa1d storage sets,

sponsive when the last digit ot' the called telephone. number has been transferred to thestorage set for rendering said storage set effective to operate saidsignal; lamps in a particular combination depending on the digits stored.

a In witness whereof, I hereunto subscribe my name this 29th day of March,

A. D. 1927. RUDOLPH FRANK counting relay group, means in the counting pulses in each relay group for counting the number of imsuccessive digit of a telephone number, and means for transferring each digit from the counting relay group to successive relay groups in the associated storage set as soon as received.

27. In a telephone system, a plurality of Inulti-digit storage sets on which telephone numbers are registered, means for selecting an idle storage set responsive to a call, and means for preventing the mutilation of a digit due to its being dialed before the selection of a storage set, said means comprising a single digit receiving device comprisr ing a group of counting relayson which the first digit may be registered while an idle storage set is being selected.

28. In a telephone system, a plurality of storage'sets for storing the digits of a called telephone number, a number indicator controlled by said sets, automatic switching mean-s for selecting an idle storage set responsive to the-initiationof a call, a digit receiving device wherein the first digit of a be temporarily called telephone number may stored until an idle storage setis selected, and means for transferring the digit registered from the receiving device to the selected storage set prior to the receipt of the next digit of the called number.

29. In a telephone system, a digit receiw ing device efiective immediately when taken into use for registering the first digitof a called telephone number, a plurality of storage sets, a number indicator controlled by said sets, automatic switching means for-selecting an idle one of said storage sets operated responsive to said receiving device being taken into use, and means for transferring the registered digit from the receiving device to the selected storage set prior to the receipt of the second digit of the called number.

30. In a telephone system,- ing device, storage sets accessible to said device, means for associating an idle one of and means. 'res device, means for transferring the digits from said a digit receivr

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