US1790935A - Telephone system - Google Patents

Description

Feb. 3, 1931. c. E. LoMAx ET AL 1,790,935

TELEPHONE SYSTEM Filed Sept. 9, 1927 3 Sheets-Sheet @imlmnuimunumlmmml if v 40 Ew i: lx

Y a f n0 l lll l II l l f IIIIIIII! IIIIIIIIII Q i D: h *2 h IIN-@IIN I Mnmmngmmnn I Feb. 3, 193i. c. E. LOMAX T AL.

TELEHONE SYSTEM x Filed Sept. 9, 1927 5 Sheets-Sheet 2 les rwen 015 Ela? ence .Elim ax and LennardLEu Feb. 3, 193-1. c. E. LoMAx ET AL v 1,790,935

TELEPHONE SYSTEM I Filed Sept. 9. 1927 3 Sheets-Sheet 3 Irr-el'w-s Elarence Einwand-Lennard L llqles Patented Feb. 3, 1931 Unirse stares rarest 'oF-ries CLARENCE E. Lomax, or oex Pau-K, AND LEoNARn L. Russians, or wirnaroiv, rILLr- NOIS, ASSGNORS'TO RESERVE HOLDNG COJIPANY, OF VKANSAS CITYQMISSOURI, Y

GORPORATON OF DELAVJARE Y TELEPHONE SYSTEM Application filed September 9, 1927. Serial No. 218,391. l

Ther present invention relates to automatic telephone systems in general b-ut is concerned `more particularly with methods of establish ing so-called two-number toll connections between two automatic telephone -systems located in adjacent cities.

he inter city toll lines terminate in a suburban automatic exchange which is part of the automatic system serving the first large city. Due to the location of this' suburban exchange, which is approximately halfway 'between the two cities, calls to subscribers calls are intercepted by a` toll recording opei'ator in order to make a record of these calls. Subscribers in the first city aswell as the subscribers in the suburban'ex'change prefix the digit 0 before dialing the regular directory telephone number of the desired sub scrilcer in the second city. The subscribers in the second city also prefix the digit 0 before dialing the regular directory telephone numj ber of the desiredsubscriber in the first line `signals the toll recording operator, and is then restarted by the operator in'order to retransmit the remaining digit or digits of the called number.

According to anotherfeature of the invention, calls 'originating in the suburban exchange for the second city are routed over the same outgoing trunks which'are accessible to the register sendcrsfor extendingiintercity connections. As suburban subscribers'are not charged for calls to thesecond city, it is noi necessary ina suburban to the second city call to include a register sender in the connection and, therefore,v the suburban subscribers have direct access by way of first selectors' tothe same outgoing trunks to the second cityas the register senders. ByV this trunkingfan rangement the subscribers in one automatic district are divided into'two classesand the subscribers iny one class (suburban subscribers) a'regiven free service while the 'subscribrers in the other class (city subscribers)v are assessed a `'toll'chargealthough both classes of subscribersdial thefsvame'call numberand use acominon group of trunks. y Y

Another feature of the invention relates to a discriminating registerA sender which either signals the toll recordingoperator 'or f notl depending upon -whether the calling subscr'iber inthe second-'city is calling al subscriber in the first" city or aI subscriber in the suburban exchange.

According toa further' feature,v` thev number of digits untransmitted' by theregister sender at the' time the`operatonissignalled can be variedfby suitable cross-connections between terminals provided forsucha pui'- pose. Y f g l Y Referringnow to thedrawings comprising Figs. 1-3, inclusive, Fig. l', shows diagrammatically part ofthe interexchange trunking vbetween a main exchange "in` the'v first city, denoted herein as the Muncie exchange, the suburbanvr or Midway exchange, which is in reality part of theA automatic Vsystem of the `first city although located approximately half-way between the two citi'esjfand a main exchange ofthe second city, known asSouth exchange. llfigs. 2 3, inclusive, show by j meansof the usual circuit diagrams'fa' suliioient amount of apparatus in the system embodying the 'principles ofthe invention'to enable the invention to `bedescribed 'and' unof 'the usual automatic type.Y At the Muncie oce, with which the substation A is associated, t-he subscribers line terminates in the usual line or trunk selecting switch LS. A number of these lineswitches have common access to a group of first selectors such as selector DS.

The first selectors, otherwise known as district selectors, are used to select trunk lines to different districts in the system. The district selector DS is indicated as having access to four telephone districts accessible from the sixth, seventh, eighth, and ninth levels. The outgoing trunk lines terminating in the tenth level of the district selectors are used by the subscribers in the Muncie ofice for completing telephone connections to the subscribers in the second city. According to the usual practice, if there are more than ten trunks in a group extending to any one district, secondary lineswitches may beV used in order to give all the selector switches common access to all of the trunks. This latter arrangement, however, is not indicated in the drawing. As the Muncie cnice is in the sixth district, the trunk lines extending from the sixth level of the district selector DS terminate in second selectors such as indicated at OS. The second selectors, otherwise known as oliice selectors, are used to select trunk lines to the dierent offices in the same telephone district. The second, third, and fourth levels of the oflice selectors such as OS give access to groups of outgoing trunks extending to different offices in the sixth telephone district of the system. The outgoing trunks for the Midway othce, which is in the sixth telephone district also, extend from the fifth level of the office selectors, as indicated in the drawing. As the Muncie oiiice is in the sixth district and is the sixth oflice in such district the sixth level of the oflice selectors are used for completing calls to the Muncie subscribers. As indicated in the drawings the trunks extending from the sixth level terminate in thousands selectors such as indicated at TS. Following the usual practice, the thousands selectors have access to ten groups of hundreds selectors such as selector HS, and the hundreds selectors in each group have access to ten groups of connectors such as connectors O. The connectors, of course, will have direct access to the subscribers lines.

vIncoming calls from the Midway office and incoming calls from the second city are handled by means of incoming selectors which have their banks multipled with the thousands selectors. One of these incoming trunks is shown as terminating in the incoming selector IS which has its banks multipled with the banks of the thousands selectors TS. Incoming calls from other telephone districts use incoming second selectors which have their bank contacts connected in multiple with the bank contacts of the office selectors such as selector OS. This arrangement, however, is not indicated on the drawin s.

2gThe-layout of the Midway oftice follows the same general plan as Vhas been explained in connection with the Muncie oce, except for certain changes which will be described more fully hereinafter. In the Midway ottice, the reference letter A indicates a subscribers station of the usual automatic type and the switches LS', DS', OS', TS, IS', HS, and C are similar to the switches shown in the Muncie oiiice and have in general the same trunking arrangement.

The outgoing trunk lines from the tenth level of the district selectors such as DS extend to repeaters such as REP and terminate in incoming district selectors such as IDS in the South oiiice which ofhce is located in the seventh district of the second city network. This group of trunk lines is for use by the subscribers in the i'irst city as well as subscribers in the Midway oliice for calling any subscriber in the second city. Y

The previously mentioned outgoing trunk lines from the Muncie exchange for calling subscribers in the second city terminate in trunk relay groups such as TR in the Midway office. A register sender selector, such as RSS is associated with each trunk relay group for automatically selecting an idle register sender such as RS. then a call is received von the trunk relay group TR the register sender selector RSS automatically hunts for and selects an idle register such as RS. When an idle register sender is seized the trunk relay group causes an outgoing secondary lineswitch such as OLS to automatically hunt for and seize an idle trunk of the group extending from Midway to South.

Outgoing calls from the Midway oiiice to .the Muncie ofce are completed over the outgoing trunks extending from the sixth level of the oiiice selectors. One such trunk line is indicated as extending from the sixth level of the o'liice selector OS" to the repeater REP. Outgoing calls to other offices in the sixth district are completed over trunk lines coming from the second,'third, and fourth levels of the office selectors while calls to local subscribers are completed via the fifth level from which trunks extend to thousands selectors such as indicated at TS. Outgoing calls to other districts are completed over the seventh, eighth, and ninth levels accessible to the district selectors such as DS.

Since the Muncie oice is in the same district as the Mid way ol'lice the incoming trunks from the Muncie olice terminate in incoming selectors which have their banks multipled with the thousands selectors in the Midway oilice.V One such trunk is indicated in the drawings as terminating in the incoming se- Cil lector' IS which hasits banks multipled with the banks of the thousands selectors TS.

ncoming trunks from the second city terminate in trunk relay groups such as indicated at TR. The trunks relay group TR is similar'to the trunk relay group TR and has a register sender selector such asV RSS associated therewith which is similar to the register sender selector RSS. The register sender selectors such as RSS have access to a group of register senders one of which is indicated at.v RS. Each trunk relay Vgroup such as TR and TR have conductors leading to a toll recording operators position. Associated with each trunk relay group TR there is provided a combined district and oftice selector such as indicated at DOS. Each of the oi'iice selectors DOS must have access to groups of trunk lines extending to the wseventh, eighth, and ninth districts and must have access also .to groupsof trunk lines extending to the various offices in the sixth district. kThe seventh, eighth, and ninth levels of the selectors DOS are connected in multiple with the seventh, eighth, and ninth levels of the district selectors in the Midway ormnce by means of which such combination district and ol'lice selectors may extend connections toward subscribers lines in the seventh, eighth, and ninth districts. The second, third, fourth, fifth, and sixth levels of the selectors DOS are multipled with the second, third, fourth, fifth, and sixth levels of the oihce selectors in the Midway oihce. As there are only a few districts in the First cityV it is not necessary to assign all of the levels of the selectors DOS for the outgoing trunks extending to the various districts and therefore the remaining levels may be used for trunking into the various oces in the sixth district, only five in number. Since the selectors DOS have access to trunk lines extending to the various oflices in the sixth district and since such selectors are in the Midway o'ice the district selecting digits can be skipped by the register senders in case Athe call is for a. subscriber in the sixth district because the call already has been extended to a switch located in the sixth district.

The automatic subscribers station designated A2 and the lineswitch LSQ in the South office are similar to the automatic subscribers stations and lineswitch LS in the Muncie ofiice. Calls from subscriber A2 to the subscribers Whose lines terminate in the South office extend by. way of'district selectors such as DS through office selectors such as OS, thousands and hundred selectors such as TS and HS to connector switches such as C.

The outgoing calls from the South othce to subscribers lines inthe Muncie or Midway oflices are extended by way of the trunk lines in the tenth level of the district selectorssuch asDS to the trunk relay groups such as TR in the Midway oice. The incoming calls from the iirst city, `such as the Muncie and the Midway ofiices, are extended over trunk lines which terminate in incoming districtselectors, such as lDS, the banks of which are connected in multiple with the banksof the district selectors DS. The tenth level of the nceming district selectors lDS, however, are not multipled with the districtselectors DS.

ln Zthe trunk relay group TR, comprising a plurality of relays, is shown in det Associated with the trunk relay group t is a.V register sender selector RSS which is ofthe saine mechanical construction as the well known rotary lineswitch in which the wipers have no normal position. rlhe register sender selector RSS is individual to the trunk group ll and has access to a group .of er senders one of which is shown in de- 'llo the right ofthe trunk relay group ano associated therewith there is shown an outgoing secondary lineswitch OLS which is mechanically the saine as the register sender selector VRSS and which has access to the trunk lines extending to the incoming disrict selecto s such as lDS in the South ofiice via the trunk repeaters such as REP. Repeaters and incoming district selectors of this type are well known in the art and as they form no part of the Vpresent invention they are only diagrammatically shown. ln the lower right hand corner of Fig. 2 there is shown only that part of a tool recording operators position which will enable the inventionto be explained and understood. This equipment is individual to trunk relay group TR and consists of a pair of relays, a pair of lamps, a listening key LK for connecting the operators head set to the trunk line in use, and start key for restarting the yregister sender to transmit the remaining digits. of the called number after the operator has been signalled and she has made al Vrecord of the call. K -K y ln Fig. 3 there is shown a register sender which` is one of the group accessible to the register sender selector RSS Fig-2. ln the upper left hand corner of Fig. 3 there are shown the sequence switches S and S whichA are used, respectively, to control the registration and retransmission of the impulses; in the lower right hand corner of Fig. .3. there is shown the sender switch SS which sends out the correct number of limpulses for each digit; in the lower left hand corner there is shown theoiiice register' @R and the intermediate distributing frame lDl?. by Ymeans of which the oiiice code may be readily changed; and inapproximately the center of the figure there are shown the digit registers Rl to R4,

inclusive, which are used to register the four f subscribers digits .in a called telephone number. l

legarding 'the equipment involved inv this n iig-ure, it maybe 'saidthat the sequence switch S and the sending switch SS are of the well known rotarytype of switch in which the wipers are moved in a forward direction only and are advanced upon the back stroke et the stepping magnet rather than upon the front stroke. The olice register OR is an automatic switch ot the well known Strowger type and its bank contacts are accordingly arranged in horizontal rows or levels. The sequence switch S together with the digit registers to El, inclusive, are or a simple type of switch having' wipers which are advanced y in a forward direction by a stepping magnet and which are restored to normal by the release magnet under the control ot their respective ott-normal contacts.

A detailed description ot the operation of the apparatus shown will now be given. For this purpose it will be assumed that the subscriber at substation in the Muncie oiice, desiring to make a call to substation A2 in the South otlice, removes his receiver. `When this occurs, the individual lineswitch LS seizes an idle lirst selector such as DS in a well known manner. ln order for the ls/funcie subscriber A to complete a connection to the .South subscriber A2 it is necessary tor subscriber A to dial the digit O7 before dialling the regular directory telephone number ot' subscriberl A2. Responsive to dialling the digit O the lirst selector DS is operated in a well known manner to seize an idle outgoing trunk extending to the Midway oitice. Assuming that the trunk shown in 2 is the trunk over which the call is to be established, responsive to the seizure or this trunk a circuit is closed for line relay 3l ot the trunk relay group TR as follows: ground by way ot the lower winding of relay 3l, resting contact of armature il and said armature, conductor 27 over the loop circuit via the seized repeater REP Fig. l, conductor 25, armature 39 and its resting contact, to the upper winding or" relay 8l and battery. Line'relay 3l. now energizes and at armature 3a closes a circuit for release relay 32 whereupon release relay 32 energizes and places ground upon release trunk conductor L13 at armature .85 and at armature 37 closes a circuit for switching relay 8l and stepping magnet 82 ot the register sender selector RSS in series, and at armature 38 connects test wiper 89 to the junction of the said switching relay and stepping magnet.

The operation now depends upon whether the trunk terminating in the bank contacts upon which the wipers ot the register sender selector are standing is busy or idle. Assuming tirst that the trunk is idle, switching relay 8l energizes immediately, seizing the trunk. Y Due'to the high resistance of the switching relay the stepping magnet is not energized in series with said relay. Assuming now that the trunk upon which the Wipers of the register sender selector are standing is busy, switching relay 81 is short circuited by ground potential encountered on the busy test Contact by Atest wiper 89 and does not energize. Stepping magnet 82, which interrupts its own circuit, is operated from this same ground potential through test wiper 89 and advances the wipers 87. to 90, inclusive, step by step in search of an idle trunk. Assuming that the trunk comprising conductors 91 to 94, inclusive, is the first one found to be idle, the wipers 87 to 90, inclusive, are rotated and stopped in engagement with the bank contacts in which the said conductors 9i to 9d, inclusive, terminate, whereupon switching relay 81 energizes and grounds test wiper 89 at armature 85, thereby making the seized registersender busy immediately. As a :turther result of the energization of switching relay 8l, it prepares trie switching-- through circuit at armature 86, at armature 88 prepares a circuit tor signalling the toll recording opera-tor; land at rinature Se closes the circuit tor energizing relay 30 as follows: grounded armature 187 (Fig. 3), conductor 92, wiper S8, armature 84: and its working contact, and winding of relay 30 to battery. Relay 80, upon energizing, at arma.- ture d5 connects a bridge across trunk conductors 42 and 44: extending to the outgoing secondary lineswitch OLS. Responsive to the closure ot this bridge line relay 5l of the outgoing secondary switch OLS energizes over the following circuit: ground at armature 6l, conductor 44, normally closed springs controlled by armature el, armature 45, normally closed springs controlled by armature 39, conductor 42, armature 57. and its resting contact, and winding of relay 5l to battery. Line relay 5l, upon energizing, at armature. 54 grounds the release trunk conductor 43; at armature 55 connects the test wiper 73 to the junction ot' theV switching relay 52 and stepping magnet V53, and closes a circuit at armature 56 through the switching relay 52 and stepping magnet 53 in series.

rEhe operation depends upon whether the trunk terminating in bank contacts upon which the wipers of the lineswitch are standing is busy or idle. Assuming first that the trunk is idle switching relay 52 energizes immediately seizing the trunk. Y

Assuming now that the trunk upon which the wipers or" the lineswitch are standing is busy, switching rela-y 52 is short circuited by theV ground potential encountered on the busy test contact by test wiper 7 3 and does not energize. Stepping magnet 53 which interrupts its own circuit at armature 62 is operated from tais same ground potential through test wiper 7 3 yand advances the wipers 72 to 74, inclusive, step by step in search of an idle trunk. Then an idle trunk is reached, which trunk, it will be assumed, is the one comprising conductors 75 to 77,

vm im.

inclusive, eatending4 to the repeater REP and the incoming rst selector IDS in the ySouth exchange, there is no .ground potential encountered upon the test contact thereof by test wiper 73 and switching relay 52, being no longer short circuited, energizes. Stepping magnet 53, however, docs not energize at this time, on account ot the high resistance of the switching relay 52. Upon energizing, switching reiay 52 disconnects test wiper 7 3 from the junction of its own winding and that of the stepping magnet 53; at armature 58 grounds release trunk conduct-or 43; conn necsl ground through armatures 56 and 60 to the conductor 7 6 thereby making the seized trunk immediately busy; and at armatures T and 61 disconnects the line conductors 42 and`44 from the winding oi" the line relay 51 and ground, and extends them by way of wipers-mand 74, conductors 75 and 77, to the line relay'in the repeater REP. The linerelayv in the repeater energizes and prepares the repeater circuit for repeating impulses through to the incoming. selector IDS. rThe circuit operationsot the repeater and the incoming selector IDS, being well understood and forming no part of the present invention, are being `omitted and will be referred to only briefly hereinafter. Betore Vline relay 51 deenergi'zes ground is fed from armature 79 in the repeater io'r maintaining .the switching relay 52 in operated position.

Responsive to the grounding of conductor 93 by switching relay 81, (Fig. 3) relay 173 energizes and at armatures 184 and 186 opens therelease circuits of the register sender, and `at .armature'185 prepares the locking circuits for relays172, 200 and 225.

rlhe apparatus in Figs@ 2 and 3 is now ready to receive the impulses generated by the calling subscriber. The calling subscriber A will now dial the regular directory telephone number of the desired lsubscriber A2 in the South office.

When the calling subscriber manipulates his calling device in accordance with the first digit in the called number, the circuit of line relay 31 ot the trunk circuit TR is opened a corresponding numberv of times. Upon each of the Vresulting deenergizations of line relay 31, it closes at larmature 35 a circuit for the vertical magnet 151 ofthe oitice register OR Fig. 3 as follows: from ground by way of resting Contact of armature .35 and said armature, armature 86, wiper 90, conductor 94, slow acting series relay 101 (Fig. 3) wiper 109 0f sequence switch S, the vertical operating conductor 115, and vertical magnet 151 ofthe oiiice register OR'to battery. By the operation of the vertical magnet 151, the wipers 155 to 158, inclusive, of the office register OR are raised step by step and come to rest opposite the desired level of bank contacts. Relay 101 is energized 'in series with ythe vertical mgil'ety and being slowacting, maintains its at armature 104 a circuit for stepping magnet 105 of the sequence switch S.

At the end of the series of impulses trans-- mitted to the vertical 'magnet of the office register OR, slow acting series relay 101 deenergizes and closes at armature 103 the circuit of the stepping magnet '105 of. the sequence switch S,y whereupon the stepping magnet 105 energizes and advances the wipers 108 and 109 into engagement withthe 'second set of bank contacts. A moment later, slow acting relay 102, whose'cir'cuit is-Open at armature 103, deenergizes and opens the circuit of magnet105 at armature 104.

The impulse ldistributing wiper 1090i the sequence switch S is now in engagement with the bank contact associated with the rotaryV magnet 152 of the oiiice register OR. Accordingly, when the calling subscriber manipulates the calling device in accordance Ywith the second digit in the desired number, the resulting series of impulses is transmitted over the circuit above traced to wiperV 109 of the sequence' switchfS and thence by way lof the second associated bank contact,and conductot1V 116 to rotary magnet152. By the opera-y tion of the rotary magnet 152, wipersV 155 to 158, inclusive, of the oice register OR areV rotatedinto engagement with the desired set of bank contacts in the level selected by the first digit, whichcontact's, it will be assumed, are the contacts indicated by reference numerals 214 to 217 inclusive;

At the end of this second series of impulses, the wipersv 108 and 109 of thesequen'ce switch S are advanced in the hereinbefore described manner,` and 4wiper 108, upon coming into engagement with the third associated bank contact, connects ground to the interrupter 17 6 thereby starting the sending switch SS in the manner to be pointed outlhereinafter. In addition, wip'er 108 in its third position closes an energizing circuit for relay 225 which thereupon energizes `and locks itself in 'energized position at armature 226. Relay 225 now maintains conductor 129 grounded so that the sender start circuit is not interrupted when wiper 108 moves .to its seventh position.

, When the' irst subscriber digit is dialed, the steppingmagnet161 of the irstdigit register R1 is operated over the circuit including the wiper 109 of the sequence switch S an conductor 121. Stepping magnet v161 advances the wiper 159 into engagement with the bank contact corresponding to the digit tact corresponding to the number of impulses received.

Returning now to the point at which the wiper 108 connected ground to the interriipter 17 6 to start the sender, the circuit for operating the stepping magnet 196 of the sending switch SS may be traced as follows:

the ground connections from sending conductor 92 without effect at this time because the sending conductor 92 is grounded at armature 187 ofthe pickup relay 174.

' UponA the,l subsequent deenergization of stepping magnet 196, the wipers 194 and 195 are advanced into engagement wit-h the next set of bank contacts. l/Vhen this occurs, wiper 195 engages a grounded'contact, whereupon pickup relay 174 venergizes and removes at armature 187 thecground fromimpulse conductor 92. At this-time, however, ground is again applied at armature 198 so as not to send out an'impulse over conductor 92 on the first step of the sending switch SS. Relay 174 also places an auxiliary ground on conductor 98 Vat armature 188 so as to maintain the register sender busy until the sender has Vcompleted its operation in case the calling subscriber should hang up prematurely. As 'a further result of the energization of the pickup relay 174it closes at armature 189 a circuit over conductor 118 for the stepping magnet '111 of sequence switch S, where- :l

upon the stepping magnet 111 energizes preparatory to radvancing` its associated wipers.

When ground is disconnected from the impulsing conductor 92 at armature` 187, each of the subsequent energization's of the stepping magnet 196 results in the transmission 'of an impulse over the impulse conductor 92.

rlhe wipers of the sending switch are advanced in the usual manner upon eac-h subsequent deenergization of the stepping'magnet 196. New, referring to the oiiice register OR itr will be noted that the first wiper155 of the office register OR is in engagement with Vthe bank contact 214, which is cross-connected on the intermediate distributing' frame IDF'by `means of a jumper to the seventh impulse stop conductor 7 Accordingly the first code digit to be transmitted is the code digit 7 and when 7 interruptions-occur inthe im- `rlpulse,Concmctor 92, the stop wiper 194 of the has access.

sending switch is advanced into engagement with the bank contact in which the seventh impulse stop conductor 7 terminates, and stop relay 175 energizes over the following circuit: from ground by'way of the stop conductor control wiper 118 of the sending control sequence switch SV, the first associated bank Contact, the first code digit stop conductor 181, wiper 155, bank contacts 214, the jumper on the intermediate distributing frame DF, the seventh impulse stop conductor 7, the corresponding contact in the bank of wiper 194, conductor 140, and stop relay 175 to battery. Upon the closure of this circuit, stop relay 175 energizes and grounds the impulse conductor 92 at armature 190 thereby terminating the transmission of impulses. Stop relay 175 also opens the circuit of the stepping magnet 111 of sequence switch S and closes a locking circuit for itself at armature 192; and shifts at armature 193 the circuit of the stepping magnet 196 from the interrupter 176 to wiper 195 through the interrupter contacts 197.

As a result of opening the circuit of steppino magnet 111 of the sequence switch S at armature 192, stepping magnet- 111 deenergizes and advances its wipers 110, 113, and 114 into engagement with the second set of bank contacts; and as a result of shifting the circuit of the stepping magnet 196 of the sending switch SS at armature 193, stepping magnet 196 is operated through wiper 195 and interrupter contacts 197 to advance its wipers step by step until wiper 195 engages its normal position bank Contact. With the| wipers of the sending switch SS in their normal position the circuit of the pickup relay 174 is opened and said relay after an interval deenergizes.

In the. trunk relay group TR Fig. 2, as a result of each of the seven interruptions of ground from the impulse conductor 92, relay of the trunk relay group deenergizes a corresponding number of times thereby intertending to tlie'repeater REP. The repeater infa well known manner repeats the impulses over the trunk extending to the incoming districtY selector IDS and said incoming district selector is operated responsive to said interruptions to stepthe switch opposite the seventh level of bank contacts to which it The incoming district selector IDS, after the cessation of impulses, automatically hunts for and finds an idle trunk inthe seventh level extending to an office selector such as OS. In the register sender, the slow acting pickup relay 174 falls back at the end of the interval for which it is adjusted and opens the circuit of the vslow acting stop relay 175 at armature 189. Stop relay 17 5, being also slow to release, falls back after an interval and again starts the sender. The interval re- 7155 Aquired for relays 174 and 175 to fallback one Arupter 176, thereby starting the sender for the transmission of the second and last code digit. Upon the first energ'izationv and de- "energization of the stepping magnet 196 the circuit for pickup relay 174 is again closed ovenwiper`195. Pickuprelay 174 accordinglyenergi'z-es; .again closesthe circuit for stepping-.magnet111at armature 189; and at armature` 137 again removes one of the vground connections from impulse conductor 92. 'frccordingly, upon each of the following ene'rgizations of the' stepping'magnet 196' groundis removed from the impulse conduct0r `92 for controlling the operation of relay in th-e'ltrunk re'lay groupTR as previously described.

'At the end of the six interruptions produced over' conductor 92 by stepping magnet 196,'steppin'g magnet 196 deenergizes `and again connects ground to impulse conductor 92 and again advances the wipers 194 and'itime itltransinits the first subscribersv digit 195. Wiper 194,'at`this time engages the bank contact in which the sixth impulse stop conductor 6-terminates`thereby closing a circuit for stop relay 175 as follows: from ground by way of stop conductor control wiper 113 of the sequence switch S', the second associated bank contact, the second code digit stop conductor `132, wiperf 156, bank contacts 215, the jumper connected tothe sixth impulse stop conductor 6, the associated Contact in the bank of wiper 194 of switch SS, conductor 140, and winding of stop relay 175 to battery. Upon energizing, stop relay 175 again grounds the impulse conductor 92, again Vcompletes the locking circuit for itself, again opens the circuit of stepping magnet 111, andagain completes the restoring circuit for the sending switch S'S in the same manner as previously described.

Returning now tothe point at which the circuit of the stepping magnet 111 of the sequence switch S was open-ed at the end of the second code digit, stepping magnet deenergizes and advances the wipers '110, 113 and 114 out of engagement with the second to trunk the call to the desired oiiice in this case, the third and fourth bank contacts 216 and 217 ofthe office register-OR are' c'rossconnected by' means of a'number f-Jumpers Ground over the fourth code stoo conductor 134 to the fourth office register wiper 158 and thence by way of bank'contact 217 over the i previously traced circuit to stepping magnet 111-1. Accordingly, the wipers 113 and 114 areY automatically.'advanced another step and wiper113 places ground on the Vfirst subsriber digitstop conductor 141.

The starting ofthe sender SS is now dependent upon whether the calling subscriber has'dialed the second subscriber Vdigit ornot.

Assuming that the calli-ng subscriber'hasl dialed tlieisecondv subscribers digit tlien't-he :90 `register"switch-R2 is operatedand ground is 'connected by'way'of o'if-normal'spring 173,

conduct`or 135wip`er 110, conductor 130` to the -interrupter 176 fory vagain` starting thel sender' to transmit the 4subscriber digits.

y'VVhenthe senderis 'started for the third which` is registered on the 'digit'` register R1. This digit isterminated in the .liereinbeforeV described manner vwhen vwiper 194 :of kthe sending Aswitch "SS arrives upon the impulse stopv conductor upon which wiper 159 of the digit registerRl is standing. The wipers of the 'sending switch are rotated back to 7 Ytheir'initi'al starting position and the'trans- "o5 mission o f the second subscribers digit starts providing thethirdv register has been ,operated by the calling subscriber thereby vcausingthe registerv R3 to'applyground to conductor 136 forva'gain starting the sender switch SS.

After transmission ofthe rst subscribers digit, the wipers of the sequence switch S are advanced `in the same manner as previouslyV described and wiper 113 connects ground to thesecond subscribers vdigit stop conductor 142 in order toterminate the second subscribers digit, as determined by the setting of the digit register R2. 1n the same way, the wipers 110, 113, and 114 of the sequence switch vS are advanced at the end of the second sub- Vscribers digit, and ground is extended over set of bank contacts and into engagement with the third set, whereupon wiper 113, grounds the third code digit stop conductor 133. Since only two code ldigits. are needed the:thirdsubscribers digit stop conductor 143 to the wiper of the third digit register R3. The starting of the sender is now de-V pendent upon whether the calling subscriber has dialed the fourth kand last subscribers digit. :Assuming that the calling subscriber has Aoperatedthe digit'register R4, ground is connectedby way ofvoii'normal springs' icc i d lh-f the setting of the digit regist and after termination on the sequence switch o nio*` es one step to its neXt position at wiper 113 the sequence switch S grounds the fourth subscriber digit stop conductor 144. The sending switch SS is again restored to its normal position and the pickup relay 174 and stop relay 175 are again deencrgficd preparatory to sending the fourth and last subscriber digit.

1t will be remembered that the sequence switch S advances one step after each series of iinpul es and when the calling subscriber has dialed the last digit of the called number the sequence switch S will be advanced to its seventh position whereupon a circuit is closed for energizing relay 63 2) as follows: ground byway of wiper 108, seventh bank contact accessible to wiper 108, jumper 128, terminal 126, resting contact ot armature 223 and said armature, winding of relay 171, conductor 91, bank contact accessible to Wiper 87 and said wiper,-armature 83 and its working contact, conductor 29,and winding of relay 63 to battery. Relay 171,beingniarginal, does not energize in this circuit but relay 63, upon energizing, at armature 65 closes a circuit for lighting the call lamp 69 at the toll recordoperators position. llhevtoll recording operator operates the listening key LK there-- by connecting her head set directly across the trunk conductors 25 and 27 via the conductors 26 and 28. After receiving the desired information from the calling subscriber the toll recording operator makes the usual toll ticket and momentarily presses thestart key whereupon relay 64 energizes. Relay 64, upon energizing, at armature 66 completes a locking circuit for itself over the grounded conductor 29; at armature 67 opens the circuit of the call lamp 69;` and at armature 68 closes a circuit for lighting the sending lamp 70 which lamp remains lighted until the register sender and register sender'selector are released after the linal digit has been sent.

`When the start key is released, relay 171 in the register sender energizes due to the combined current iow through relays 63 and 64. Relay 171, upon energizing, at armature 186 closes an energizing circuit for relay 172 wherei on the latter relay energizes and at arma* e 181 completes a locking circuit for itself. Relay 172 at armature 182 connects ground to Vconductor 129 which however is w thout result at this tiine; and at armature connects ground 'to conductor 138 in order to stai"u the sending switch SS to send the v 183, conductor 138, wiper 110, conductor 130,

interrupter 176, resting contact of 193 and said armature, and winding of stepping mag net 196 of the sending switch SS to battery. Th fourth and last subscribers digit is sent n the saine manner as previously described ,nd after the termination of the impulse ransniission the sending switch SS returns o its normal position and the pickup relay 74 and stop relay 175 deenergize in the inanner previously described. The stepping inagnet 111 of the sequence switch S is again operated and when the stepping magnet 111 deenergizes and advances the wipers of the sequence switch S a circuit is closed for energizing the switching through relay 33 asM follows: from grounded wiper 113 by way of conductor 94, bank contact of director selector, wiper 96, armature 86, armature 35 and its working contact, yand winding of switchiiiig through relay 33 to battery, Switching` relay 33, upon energizing, closes a'iocling circuit for itself at armature 40 l y way or grounded release trunk conductor and at armatures 39 and 41 disconnects 7 the conductors 25 and 27 from the windings" of the line relay 31 and connects them instead to conductors 42 and 44 extending to the outgoing secondary line switch OLS, at the same time disconnecting the bridge across the con duct-ors 42 and 44 which is closed at armature of relay 30. The established connection is now under the direct control of the calling line, and the established connection is held by the repeater REP in the usual manner.

As a result of the line relay 31 of the' trunk relay group TR being cut olf, it deenergizes and opens the circuit of the release relay at armature 34. 1n response to this, relay 32 deenergizes after a slight interval and removes ground from release trunk` conductor 43 at armature 36, leaving the release trunk conductor grounded at armature 58. y

As a further result of the deenergization of the release relay 32, it opens at armature" 37 the circuit of switching relay 81 of the register sender selector RSS whereupon the switching relay 81 deenergizes.

1n the register sender, the release relay 173 now deenergizes and at armature 184V stepping magnet 111, whereupon stepping magnet 111 energizes and interrupts its own. circuit at contact- 112, therebyrdeenergizing and advances the wipers 110, 113 and 114 to their normal positions. As a further result of the deenergization of relay 173, ground is placed on the release trunk conductor 220 at armature 186. Responsive to this, a cir cuit is closed through the o-norinal contacts to each of tlierelease magnets of the digit registers R1 to R4, inclusive, where# switches in the sender in the same manner as previously described. The calling subscriber A2Yin the South oiiice may now dial the regular directory telephone number of the called subscriber A in the Muncie office, the district and oliice selecting digits in this instance being 6 and 6, respectively, and the subscribers digits being 3222. Responsive to dialing tlienuiiiber 663222 the register sender Fig. 3 isy opera-ted in the same manner as previously described, the wipers 155 to 158, inclusive, of the oilice register OR being set on the bank contacts 210 to 213, respectively, and the subscribers digit registers R1 toR4, inclusive, being set on the third, second, second, and second bank contacts, respectively. After the calling subscriber has dialed the district selecting digit 6 and the oliice selecting digit 6 the sequence switch S isstepped to its third position and a circuit is closed by wiper 108 for starting the sender SS in the same manner as previously described. Due to the cross-connections at theLIDF the register sender sends only the oilice selectingdigit 6. This circuit may be'traced from grounded wiper 113, conductor 131, wiper 155, bank contact 210 which is cross connected to the number 6 subscriber digit, stop conductor, Wiper 194, conductor 140 and winding of stop 'relayY 17 5 to battery. The pickup and stop relays operate inthe saine manner as previously described and Vcause the stepping magnet 111 of the sequence switch S to take one step whereupon the conductor 132 extending to Awiper 156- of the oilice register OR is grounded. lVipervlG beingin engagement with bank contact 211 and such-bank Contact being cross-connected to the skip conductor 119, the sequence switch S lis lautomatically stepped one step from its second to its third position. Due Vto the cross-connections from the bank contacts 212 and 213-to the skipA conductor 119 the sequence switch S is stepped from its third and fourth positions to its fifth position or the iirst subscriber digit position.VV The sender now sends outl the subscribers digits inl the saine manner as previously described, stopping, however,

after the third subscriber digit to signal the;

toll recording operator in the same manner as previously described. After receiving the desired information the toll recording operator again presses the start key-to allow the sender to transmit the final or last sub-k scribers digit. After the sender has transmitted the last subscribers digitthe switchenergized over the circuit previously described with the result that th-e register sender selector and the register sender are cut off Vand are available for other calls. Relay 33 ing relay 33 v`or the trunk relay group TR is aty armature 40 completes acircuitfor lock-y ing itself to grounded release trunk conductor 43. In addition, relay 33 at armature 39 and 41 connects the trunk conductors 25 and 27 to the trunk conductor 42 and 44 which extend to the office selector DOS. The established connection is now under direct control of the calling subscriber. rl`he toll recording operator by operating her listening key LK can at any time listen in on the trunk to determine whether or not the calling subscriber A2 should be charged for the call.

Regarding the established connection, it may be pointed out that since the combined district and office selector DOS is located in the 6th district and has direct access to trunks outgoing to the 6th oflice in the 6th district itvis unnecessary for the register sender to transmit the district selecting digit and therefore such digit is skipped. The usual train of automaticswitches in the called office is operated responsive to the four subscrib-ers digits oithe number to complete the' connection, whereupon the conversation may be carried on in any desiredV manner.

Vhen the conversation is finish-ed, the

subscriberat substation A2 replaces his receiver, whereupon ground is removed from the release trunk conductor extending from the oiice selector DOS to'conductor 43 over which the switching through relay 33 has beenY maintained in energized position. Switching through relay 33 deenergizes and returns the trunk relay group to normal condition. The release of the automatic switches in vthe established connection is now the same as previously described.V

Having described la tollconnection from the South oiice tothe Muncie office7 a description will now be given of a call from the South oftice to the Midway oflice describing how the register sender RS Fig. 3 discriminates between a call from the South olce to the Muncie oliice and a call from the South oliice to the Midway jofice. "In calls from the South oiiice to the Midway oliice the register sender transmits the whole of the subscribers number without signalling the toll recording operator. It will be remembered that calls from either city to the Midway ofiice are not assessed a toll charge and therefore it is not necessary in calls from the South oliice to the Midway oiiice to cause the register sender to signal the toll recording operator. A discriminating relay 200 in the register sender RS is operated onsuch calls to open the circuit for signalling the toll recording operator and said relay also closesfa circuit for causing the sender to complete the sending operation.

When subscriber A2 removes his receiver in order to make a call to subscriber A in the Midway oli'ice, the lineswitch LS2 again seizes a district selector switch such as DS. callingsubsciiber now dials the digit O bevThe fore dialling the regular directory telephone number of the called subscriber A in the Midway office. The trunk relay group TR is again seized in the same manner. as previously described. The register sender selector again seizes an. idle register sender after which the ycalling subscriber dials the :district selecting digit 6 and the office selecting digit 5. Responsive to dialling the district and oiice selecting digits 6 and 5 the wipers 155 to 158, inclusive, oi' the oiice register OR come to restin engagement with bank contacts 206 to 269, respectively.

Responsive to dialling the` subscij-ibers digits the registers R1 to R41 are setin the saine manner as previously described. lVhe-n the sequence switch Sarrives in third position the'sending switch SS is started to transmit the first oilice code. Y

After wiper'lOS of the sequence sw-itch S arrives in its third position a circuit is closed for starting the sending switchV SS in the same manner as previously described. Due to the cross-connections at the IDF' the sending switch SS and register sender transmit 5- impulses for the iirst otlice code.

` lows: from ground by way of wiper 113` in its second position, conductor 132, wiper 156, bank contact 207, terminal207, jumper onl IDF, terminal 203, conductor 201, normallyclosed springs controlled by armature 22), and winding ci relay 290 to battery. Upon energizing, relay 200 at armature 220 opens its original energizing circuit and closes a locking circuit for itself over the conductor extending from grounded armature 185.l At armature22l, relay 200' connects the 'grounded conductor 201 to conductor 202' and thenceby way ot terminal 204; and jumper on the IDF to skip conductor 119. At armature 22e, relay 200 prepares a circuit for" connecting ground to the sender start conductor w ich terminates in the bank of the sergent-Erice` switch S. After' transmitting the five' ini-- pulses constituting the oiiice code VJthe sequence' switch S" isautomatically stepped to its' fifth position due to the cross-connections of bank contacts 207, 208, and 209 to the skip con-duc'- tor 119. Thev register sender and the' sending' switch nowoperate and'send 'out ,all of the subscribersdigits whichA have been registered 'on the subscriber digit registers R51 to Ret, iii-- It will be noted that due to the oper-l ation of relay 200 the circuit for signalling elusive.

the tell recording operator is'opened at arm-ature 223 while at armature 224 the sender under control of the calling subscriber.. The register Vsender selector and the register senderare released in the same manner as previously describedV and may belused for handling other calls.

impulses transmitted by the sender opposite the fifth level of bank contacts. Referring to Fig. 1 it willbe seenY that the fifth level is in multiple with the fifth level ofthe second selector' OS and that such trunks have access to thousand selectors such asl TS.-

rlhe ottico selector DOS automatically rotates' for an idle trunk inthe yifth level and seizesl the tirst idle one whichwe will assume 'is the trunk extending to the thousand selector TS. The thousand selector TS', the hundred selectorHSand the connector C are `now,

operated in the well known manner' responsive to the digits transmitted bythe 'sender to complete the conn'e'ctionto the called line.

`lllien the conversation'is terminated V,the subscriber at substation willY replace his receiver, whereupon ground isreinoved e from the release trunk conductor t3-'thereby enabling switching through relay 33 to release. The automatic switches in the established connection will now' release and may be'` usedfor establishing other calls. ,y Y

Reierring tothe trunking arrangement shown in the' Midway' oilice in Fig. l1. it wilh be seen that the outgoing trunks toi the South oilice are seizable over two paths, oneoiIv they group of subscribers inthe saine automaticr4 district are vnoty charged for callslv going" to the second automatic" district although such calling 'subscribers r dialv the same i numbers and use'a comn'ion group of trunks. Y

One order of automatic switches inthe siXth district has been eliminated due tothe ability of theregister sender to; skip4 a district,A selecting digit, thereby using Vthe" oilice Vselecting selector-'DOS as a 'combined' 'district'.

Referring to I and o-ilice selecting selector. y p Fig.. `1 it will be seen that the" ottico' selector DOS has' access totrunksrextending to the 7, 8, and 9th districts and fio-"trunks extend' ing to-,oihces in the 6th district." This is possible because the silice selectorsare located' inthe 6th- 'district and because off-the limited. g

number districts and the limited number of offices in the sixth district. f

1 70 The otce selector DOS is operated by the Y -outh oilice `without i The other- Suitable` cross-connecting facilities coin-p pricing terminals and jumpers have beenprovided Yassociated `with the sequenceswitch S,

Fig. 3, in order to change the position in which the sequence switch S starts the send- Y .L

ing switch 53S. For example, assume that it is desired to start the sender only after the calling subscriber has iinished dialling the complete telephone number of the desired called subscriber and after the toll recording operatorv has pressed her start key. Under this condition the jumper 127 wo-uld be cut and a circuit for starting the sending switch SS would be completed only after the relay 172 is energized responsive to operation of the start key.

From the foregoing it may be seen that the duties of a toll recording operator in such a system have been greatly reduced because all that is necessary for her todo is to make` out the usual toll tickets, operate the start keys, and listen in to determine whether the calls have been completed before charging the calling subscribers.

I-Iaving described the invention, its utilityV and operation, what is considered new and is desired to have-'protected by VLetters Patent will be set `forth in theA appended claims.

lhat isY claimed is: n l, In a telephone system, a register sender for storing and transmitting a plurality of series of impulses corresponding to the digits in a called telephone number, and means in and thereafter signalling` a` toll recording operator, and manual control means con trolled by the operator Yfor restarting said sender to transmit the remaining stored digit r digits in the called telephone number.

3. In a telephone system, a register sender for storing and transmitting a `plurality of series of impulses corresponding to the digits in a called telephone number, means in said senderfor stopping the transmission of im` pulses and for signalling a toll recording operator after a predetermined number of digits in the called telephone number has been transmitted, and manual controlV means controlled by the operator for restarting said sender to transmit the remaining stored digit or digits in the 'called telephone'number.

In a telephone. system, avirst telephone district anda second telephone district, a

group of trunk linesv for use in establishing' connections from subscribers in said first district t0 subscribers in said second district, two groups of subscribers lines in said first district, a called subscribers line terminating in said second district, means responsive to a calling subscriber in either of said groups dialling theA telephone number of said called subscribers line for establishing a connection over one of said trunk lines to the called subscribers line, and means for causing only the calls from subscribers in the second group to said called line to be intercepted by a toll recording operator before the connection is completed.

5. In a telephone system, a first telephone district and a second telephone district, a group of trunk lines for use in establishing connect-ions from subscribers in said first telephone district to subscribers in said second district, two groups of subscribers lines in said first district having access to said group of trunk lines over different paths, means whereby the subscribers in the irst group can complete connections to called subscribers lines in the second district over said trunk lines without being charged for such connections, and means whereby the subscribers in the other group can complete connections to called subscribers klines in the i second district over'fsaid .trunk lines only after such calls have been intercepted by a toll recording operator for the purpose of charging such calls. v

6. In a telephone system,ltwo groups of subscribers lines, two classes of subscribers lines in said firstgroup, a group of trunk lines common to Vboth of said classes, means for establishing connectionsfrom the iirst and second classes offsubscribers lineshto said sec-ond group of subscribers -lines over said trunk lines, said meansoperated responsive to the calling subscribers dialling the same predetermined digit and the regular directory telephone number of the called line, and means forintercepting only theV calls originating from the second class subscribers lines. Y A c 7 In a telephone system, two' groups of subscribers lines, two classes of subscribers lines in said first group, a group of trunk lines common to bothof said classes, means for establishing connections from the first and second classes of subscribers lines to said second group of subscribers lines over said trunk lines, said means operated responsive to the calling subscribers diallingthe same Ypredetermined ydigit and the regular directory telephone number of the .called line, means for intercepting only the calls originating from the second class subscribers lines, and manual controlled means for completing the intercepted calls. Y 8. In a telephonesystem, a register sender forstoring and transmitting a plurality of series of impulses corresponding to the digits in a called telephone number, a toll recording operators position and a signal thereat, and discriminating means in said sender for stoppingfthe Vtransmission 0f impulses before all thedigits havebeenz transmitted and for operating said signal, said means being operative dependent upon the destination of` the call set up on the sender.

9. In a telephone system, a register sender for storing and transmittinga plurality of series of impulses corresponding to the digits in a called telephonernumber, a toll recording operators position and a signal thereat, means including an impulse distributor switch in said senderior starting the transtransmitted, and 4for closing a circuit forl operating said signal-after the calling sub'-A sc riber has dialled a redetermined number of digits, and meansk comprisingv terminals and cross-connections adapted to .be variably connected to the banks of said switch forV `variably changing the starting, stopping, and

signalling positions fof said switch.

10. In a telephone system,` a register sender for storing and transmitting a plurality of series of impulses correspondingv to the digits in a called telephone number., a toll recording operators position. and a signal thereat, means operated responsiveto a calling subscriber dialling apredetermined number of the digits of a called.l subscribers telephone number for starting the sender to( transmit impulses, means yoperated lafter theV calling subscriber has iinisheddialling all the dig:

-. its in the called subscribers number, for op-Y erating said signal, and meansl comprising Vvariable cross eonnectionswhereby the sender is not started'transmitting until afterrsaid signal has been operated.

l1. In a telephone system, a trunk line having incoming and outgoing sections, a reg-V ister sender connected to said 'trunk line at the junction of said sections for storing. a plurality of series of impulses corresponding to the digits in a called telephone number received over the incoming section of said trunk line and for transmittingv a plurality of series of impulses corresponding to tbe stored digits over the outgoing section ot said trunk line, means in said sender for stopping the `transmission before all of the stored digits are transmitted, and means exclusive-of control over the outgoing section for restarting said sender to transmit the remaining kstored digits. y

l2. In a telephone systenna first calledsubscribers line,a second calledsubscribers'line, a trunk line havingincoming and' .outgoing sections, a register sender connectedltosaid trunk line at the junction of said sections or storing a plurality of series of impulses to the stored` digits over the outgoing section of said trunk line, an'operators position and a signal thereat, means inisaid sender-for stopping thetransmission before all ofthe stored digits aretransmitted and -thereatter operating said signal in case said first line is called, and means exclusive of control over the outgoing section for restarting said sender to transmit the remaining stored digits, said sender 'transmitting all of the stored digits withoutstopping and signalling the operator in case the second line is called.

13. In a telephone system, tWotelephone districts, a main and a branch exchange in the second district, a trunk line having incoming and outgoing sections in said branch exf change,said incoming section extending to an exchange in thek irstfdistrictf a1' register sender in the branch exchange, two branches of said trunk line terminating at the june-v tion of said incoming .andoutgoing sections, y 'f one oi said branches terminating in an opera,- tors position4 and the other branch connected with said sender, means in said sender responsive to a calling subscriber in theexchangein the iirst district dialling thetelephone nur`n ber of a desired subscribers' line in the second district over the incomingv section jof said trunk line for' storing the digitsofthecalled number, means in said senderl for transmit-Av ting over then outgoing section of said trunk line a plurality of series` of impulses corresponding to the digits stored, v' nieans,insaid sender for stoppingthetransmissionfof iin-v pulses before all ,0f thestored di'gitsjvhave beentransmitted and for thereafter signalling the operator over. said ifrstbranch in 'case' a subscribers line in the vmain exchange is called., and means in said sender controlled over said first branch for restartingsaid sender to transmit the remaining stored digits in order" to complete the connection, said sender transmitting all of the storedjdigits without stopping and signalling' the operator incase fa subscribers line in the branchexchange is called. l

14. Ina telephone system, aregi'ster sender for storingand transmitting-a plurality Vof series of impulses corresponding to theoilice digits andsubscribers digits in a kcalled telephone i'iumber, means in said sjenderfor starting the transmission of` the stored digit s pulses, means in-said sender for stoppingvthe theoiiice digits and a predetermined numbe'i` of the subseribers vrdigits have beenl transmitted, and directively controlled means for restarting said sender Yto transmitthe remain` ingstojred subscriberfs digits.

' 115. In a'telephone'system, a register ,Sender for storing and tranemitting,aY plurality of series ofimpulsesCorresponding to theV4 Qfice digits and subscriberls digits in a called telephone number, discriminating means' in said sender being operative dependent lupon .the

destination of `the call set up on. the sender,

and means controlled by said discriminating means for stopping the'transmission of 1m- `pulses after all of the ofice'digits and a vpredetermined number of the subscribers digits have been transmitted.

16. In a telephone system, a register sender for storing and transmitting a plurality of series of impulses corresponding to the oflicedigits and subscribers digits in a called telephone number, means in said sender normally arranged to stopthe transmission of impulses after all the ollice digits and a predetermined number of subscribers digits have to transmit theV remaining subscribers digit4 or digits.

17. In atelephone system, a register sender for storing and transmitting a plurality of series of impulses corresponding to the oiiice digits and subscribers digits in a called telephone number, a toll recording operators position and a signal thereat, means in said ,sender normally arranged for stopping the transmission of impulses after all the oiiice digits and a predetermined number of subscribers digits have been transmitted'and for operating said signal, means for thereafter restartingsaid sender to transmit the remaining subscribers digits, andl a.y relay in said sender operated dependent on the oflice designation corresponding tothe office digits stored for disabling said normally arranged means whereby said sender completesv the transmission of lthe stored office and subscribers digits without stopping to signal the toll recording operator. n

18. In a telephoneexchange system, two exchanges, automatic switching apparatusin each exchange operable under the direct control `of calling subscribers to complete con# nections local to theexchange in which they originate, anQinter-exchange trunk line, a register sender, and means only responsive to the seizure of said trunk line in making an inter-exchange call for seizing said register sender, said register sender thereafter controlling all the automatic switching apparatus in the called exchange.

19. In a telephone exchange system, two exchanges, automatic switching apparatus in each exchange operable under the direct control of calling subscribers to vcompleteconnections local to the exchangeiniwhich they originate, means including register senders for controlling the automaticl switching apparatus in the called exchange when interexchange calls are made, a'toll recording op erators position and a signal ythereat, and

' means controlled by any one of said register senders for'operating said signal for the purpose of charging such calls.

20. In a telephone exchange system, two exchanges, automatic switching apparatus in each exchange operable under the direct control Yof calling subscribers to complete connections local to the exchange in which they originate, means including register senders for controlling the automatic switching apparatus in the called exchangewhen interexchange calls are made, a toll recording operators position and a signal thereat, means. controlled by any one of said register senders for partially operating a portion of said automatic switching apparatus to only partially complete they connection to a called line and for thereafter operating said signal, and means controlled by the operator for causing said register sender to'complete the operation of said portion of the automatic switching apparatus Vto complete ythe partially com` pleted connection. Y I

2l. In a telephone exchange system, two telephone districts each containing a number of exchanges, automatic switches in each district operable directly over the calling subscribers loop to complete' local and inter-exchange connections local to the district in which the calls originate, register senders, means only responsive to inter-district calls for seizing said register senders, means in each register sender for storing a plurality of series of impulses corresponding to digits in the called telephone number, and means in each register sender for transmitting a plurality ofseries of impulses corresponding to the stored digits for operating said switches to complete inter-district connec tions.

22. In a telephone exchange system, two telephone districts, automatic switches in each district operable directly over the calling subscribers loop to complete connections local to the district in which the calls originate, a yregister sender, means only responsive to inter-district calls for seizing said sender, means in said sender for storing a plurality of series of impulses corresponding to the digits in the called telephone number, means in said sender for transmitting a plurality of series of impulses corresponding to the storedy digits for operating said switches to complete inter-districtconnections, a toll recording operators position and a signal thereat, and means in said sender for stopping the'transmission of the stored digits aitera predetermined number of stored digits have been transmitted and for thereafter operating said signal..

23. In a telephone exchange system, two telephone districts, automatic switches in each district operable directly over the calling subscrib'ers loop to complete connections local to the district in which the calls originate, a register sender, means only respon sive to inter-district calls for seizing said sender, means in said sender for storing a plurality of series of impulses corresponding to the digits in the called telephone number, means in said sender for transmitting a plurality of series of impulses corresponding to the stored digits for operating said switches to complete inter-district connections, aV4 toll recording operators position and a signal thereat, means in said sender for stopping the' transmission of the stored digits after a predetermined number of stored digits have been transmitted and for thereafter operating said signal, and means for restarting said sender to transmit the remaining stored digits.

24. In a telephone system, a trunk line, automatic switches, a register sender for controlling said switches over said trunk line to establish a. connection, means for stop* ping the control of said sender over said switches before the connection is Vcompleted,

and means exclusive of control over said trunk line for restarting said sender to cause said switches to complete. the connection.

25. In a telephonesystem, a trunk line, automatic switches, a register sender for controlling said switches over said trunk linev to establish a connection, means for stope in the second exchange, a register sender in the first exchange for controlling said switches over said trunk `line to establish a connection, means for stopping the control of said sender over said'switches before the connection is completed, a toll recording operators position in the lirst exchanfe, and

.means controlled by the operator at said position for restarting said sender to cause said switches to complete the connection. Y

27. In a telephone exchange system, a first exchange, an intermediate exchange, and a third exchange, automatic switchesin said third exchange, an inter-exchange trunk line connecting the third and intermediate exchanges, a register sender in the intermediate exchange for controlling said switches over said trunk line on calls originating from said iirst exchange to complete a connection to a subscribers line in the third exchange, means for stopping the control of said sender over said switches after a pre-determined'number of said switches have been operated and be.

fore the yconnection is completed, and means exclusive of controlover said trunk line for restarting said sender to cause the remaining switch or switches to be operated to complete the connection.

28. In a telephone system, two exchanges, an inter-exchange trunk line connecting said exchanges, automatic switching mechanism in said second exchange, a toll operators position, av signal thereat,a register sender, means'controlled by said register sender over said trunk line for partially operating said mechanism to ypartially extend a connection to a called line, means for operating said signal, andmeans for controlling said. register sender from said operators position'toY cause said mechanismto complete its operation to complete the connectionto the called i line.

29. In a telephone system, two exchanges, automatic switching apparatus in each exchange, means foroperating all of the required switching apparatus directly over the calling subscribers loop when the connection to be set up is local tothe exchange in which it originated, a register sender, means responsive only7 to an inter-exchange call for seizing said register sender, and means in said register sender for storing those digits of the called number which determine the setting of the automatic switchingapparatus in the called exchange and for retransmit!V ting the stored digits to operate said .auto matic switching apparatus to completethe connection.V Y f 30. In a telephone system, a first exchange 'and a second exchange, automatic switching apparatus in each exchange operable under the directcontrol of callingk subscribers to complete connections .local to the exchange in which they originate, a tandem exchange,

automatic switching apparatus and a regisl ter sender in said tandem exchange, means for seizing said register sender responsive to part of the digits in a called number on a call from said firstto said second exchange,

and means in said register sender forstorf ing the remaining digits of the called number andfor retransmitting the stored digits to operate the automatic switching apparatus in the tandem and vin the second exchange to complete the connection.

In witness whereof, I hereunto subscribe my name this 7th day ofl September, 1927.

` CLARENCE ELLOMAX. In witness whereof, I hereunto subscribe my name this l 7th dayof September, 1927.

Y LEONARD LBUGGLES.

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