US1653890A - Telephone system - Google Patents

Description

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G. DEAKIN TELEPHONE SYSTEM Dec. 27, 1927. 1,653,890

l G. DEAKIN TELEPHONE SYSTEM Filed Dec. 31, 1924 5 Sheets-Sheei 3 by my Patented Dec. 27, 1927.

UNITED STATES PATENT OFFICE.

GERALD DEAKIN, or ANTwEE-r, BELGTM, .assitance To WESTERN ELECTRIC CoM- i PANY, INCORPORATED, F NEW YORK, N.Y., A COR'PORATIN 0F NEW YORK.

TELEPHONE sYsTEM.

application area December 31, 1924, serial no. 758,981, and in Great Britain r'ebruary 12, 1924.

rlhis invention relates to telephone systems `and more particularly to systems yin which calls are extended from ainanual exchange under the control ot an operator to an automatic exchange. i

lt is the object ot this inventionto providean electrical control systenitor trunlc ing between manual and automatic telephone exchanges in which the work devolving upon the manual operator is reduced toa minimum consistent with quick and etlicient service. This object is attained by the provision ot jacksor each automatic office and a link which is actuated by the insertion of a plug in said jack to associate parts oit said link with the terminals of the jack selected and associate an idle trunk to a particular exchange with said jack terminals.

Telephone tra'llic between oces in some exchange areas is handled entirely by operators. rllhe vcall is transmitted from the subscriber to anita operator who in turn transmits the wanted number to a B operator over a call wire7 and the ll operator assigns a trunk to the A operator who inserts plug in a jack associated with said trunk. This arrangement has disadvantages in that the number is sometimes misunderstood by the B operator and a telephoneconnection to the wrong sub riber'is the result. Other circuit arrangements have been invented for selecting trunks to distant oiiices with autoinatic apparatus.` rlhese, however, are quite elaborate and costly.

lin carrying the present invention into etilect each autoinatic exchange to which calls are extended is represented at the local iuianual exchange .in each operators position by jack or jacks. Associated with each set ot jacks is a group ot connecting units, each unit comprising a jack tinder, a trunk or junction tinder and a sender linifler. Switches are provided in each unit 'tor the purpose indicated by their designations. Each A operators position vis equipped with a ten-button key-set with proper designations" in order that the operator may select the desired line by operating certain ones ot the keys.

l feature o"L this invention resides in the use ot an improved electric control system ttor trunking between manual and automatic telephone excl ai'iges in. which a trunk to a particular otlice is automatically connected to a jack selected by the manual operator.

@ther features ot the invention will be apparent trom the followingdescription taken in connection with the` accompanying drawings.

llihile the inventionhas been disclosed as particularly adapted tor-trunking between manual and machine switching otlices, it will be apparent, however, from the following description that the invention has a widerv utility and by slight modification it Acould bel adapted tor other types ot equipment.

The invention will be more 'fully understood trom the following description taken in connection with the accompanying drawings in which Fig. l illustrates a schematic layout ot' the syst-ein in accordance with this invention.

Fig. shows a connecting or link circuit comprising a jack tinder switch, junction 0r trunk finder switch and a sender under switch., the purposes of which will be hereinat'ter more fully described.

ltig. l illustrates a junction or-trunk circuit extending from the manual exchanges to the apparatus ot an automatic exchange diagranimatically shown.

Figs. l and 5 illustrate the circuit and apparatus of a register sender which is set in accordance with the operation ot'` keys shown in the lower part ot Fig. 2. The automatic switches in a distant exchange are controlled in accordance with the setting of this sender.

. At the manual exchange each A operators position is equipped with a number of `jacks the samev as jack 207.3 This position is also provided with a common key-set indicated in the lower portion ot Fig, 2 which may be connected to any connecting circuit or link having access to this position.

Each connection orlink circuit consists ot a jack finder switch 10?), a junction or trunk linder switch 105 and a, sender finder switch 10d connected together in the manner indicated in Fig. l. These switches may `be of any well known `type as, for example, the well known step-by-step switch used in automatic telephone systems. The key-set illustrated at the lower part of Fig. 2 consists-o't' a set o't ten keysnumbered l to 10, the operation ot each key connecting heavy or light positive or negative battery lo the apparatus olf the sender. '.lhe automatic cxcllange illustrated diagruinniatically in Fig. Il may heet' any-veli known type as, ilor exannile, the rerertireV impulse type in which impulses are sent back to the vluder during,- the "olierationotftlic `aritornatic switches The sender circuit illustrated in Fig. l

i Detailed (lectora/Alion.

A. subscriber ol` a nianualeicchange who desires aconnection with a subscriber olf', an automatic exchange informs the operator accordingly. The operator. whose position is indicated at the lei't ot' Fig. l, inserts the callingplugl of one of the position cord circuits into an idle jack 100 ot the desired exchange. `The jack finder 103 ol an idle connecting` circuit"thereupon propels its brush assembly "until it `is associated with jack 100. ln a like manner `brush 108 is propelled to select an idle sender.` Lamp 120 is associated with the operators key-set and is lighted to indicate to the operator that switch 103 is associated with said key-sct 'lheoperator` now actuales certain oil the keys in the key-eetl to transmit the digits ot the Wanted nuinber to the apparatus oi" the sender. Then the linal digit key is actuated,` the trunk linder A105 operates to select the idle truuk leading to the distant automatic exchange; rlhe establishment olf tho call is nou" under the control ol4I the sender and the oiwrator is .tree to answer other subscribersl "callsI alI her position.

Automatic selector switches such as .shown schematically in Fig'. h are set in aclfordanee `with the operation o'lt the sender and lhe called line is `connected to the calling subscriber. 'lhe operator supervises the call in the usual niannand the end ot a conversation is indicated to the operator by the "cord `circuit supervisory larnps in the switchboard position. y

Let it be assumed that a call is received at the A operators position and that the call is answered by the Av operator in the usual Ina-nner of insertingl the answering plug ot the cord circuit into the answering jack.` The wanted number is obtained by the operator from the subscriber and the calling cord 261, is inserted Jin trunk jacl bers in connecting links the saine as x ground through the rightinner contact ol relay `39, uiindings ot magnet 2l() to grounded battery through the normal contact of relay 2li and the right outer contact of relay 246. -Manuel'. 2l() is energized over the circuit traced, to rotate brushes Nos. 212 to 215, inclusive, ot' the jack linder switch over the contacts in its bank. In a like manner other magnets the saine asilllll in a group ol links are energized by the operation ot relay 23) to rotatey switch brut-'hes the saine as lf to Q15 inclusive. The magnet windings the saule as 2l() are connected to the straps associated with the contacts of relay 23S). The terminals ol the various switches are strapped together as shown on terminals Qlll to 2t l; inclusive. lu this manner all idle switches ol" a link group are simultaneously rotated to hunt for the switch terminals associated `with the jack whichhas been actuated by the 'insertion ol a plug'. Since terminals E201 to 9.04-, inclusiic, are one set of a plurality ot ot like ter ininals, the brush inen'ibers rotate untilbrush 215 encounters terminal 20d. thus established to energize relay :21.1 over a circuit from grounded battery through ils right Winding, brush :215, terminal illlfl, resistance 205, lettinner normal contact ol. relay 20G to ground through the upper coutactof jack S207. The operation ol* relay Eil l. opens the energizing circuit for switch nlug net 2l() and thus arrests the increment oll the switch brushes. The operation ol' relay 2l l. lurther establishes an energizing circuit for relay 216 :troni grounded battery through the contact ol relay l'lfl.` winding' oi relay 216, let't Winding of relay i311. brush `lll'i and thence to grmlnd at the upper `contact ol jack 207. lt will he nolcd that the right u'irulinpol' relay 2li` is in multiple with ilu lett winding and tho wiluliugl oli relay 521V and thus the total N slsl'alicc ofthe circuit is reduced to a point "u'hcre terminal Qllfl is i'i'iaintained busy to other switch brush inclu sh o u n in Fig'. 2. The reduction in the resistance olfthis circuit :further establishes a shunt to release relay 208.

rlhc operation of relay 216 establishes an energizing circuit for switch magnet 21T troni grounded` battery through its Windings, right inner Contact ot' relay to lill It. circuit lllll iai Lese

. switch cani 401, winding' of relay 402, terininal 257, brush 222, let't Windingl ot relay 218 to ground through the right outer-.contact of relay 216. erated in the circuit traced. The operation oit relay 218 opens the energizing` circuit for switch niagnet 217 and thus arrests the inoveinent ol switch brushes 219 to 222. The operation ol relay 21S vl'nither establishes an energizing circuit 'for relay 223 troni ground through its Contact, Winding' ot'i'elay right Winding' of relay 218, brush 222.

terninial 257, Winding` ot relay 402 to` `grounded battery through the lett upper contact ot' sequence switch cani 401.' It will be noted that the circuits through the left and right windings 'ot' relay 21S are in multiple and thus the total resistance in series with brush 222 is reduced to maintain the sender busy. The operation of relay 223 connects brushes 210, 220 and 221 tronithe sender to the link circuit.

The operation of relay 402 as previously described establishesa circuit to energize the sequence sivitchlinagnet 4001"'roin grounded battery through its winding, right upper contact ol' sequence switch cani 403 to grouinl through the right outer contact of' relay 402.

The energization oit magnet- 400 rotates the sequence switch from position 1 to position 2 under the `control ot the4 vcircuit traced and to position 3 under the control ot its master contact 404. lished to operate relay 405 ,troni ground through the Winding' of relay 224, lettl outer contact ot relay 223, brush 221, terminal 256',

lett and right winding ot relay 405, right inidd'le contact of relay 402 togroundedbattory through the right upper Contact ot sequence ...ch cani l. Relay 224 does not operate in the circuit traced on account oi the high resistance ol the right wind.- iup; oit relay 405. lhe opeation ot' relay 405i establishes a ,locking circuit for relay 402 which may be traced from grounded battery through the right outer contact' of relay 405, right hand Contact and Winding; of relay/'402, thence tov around over the operatingv circuit :for relay -102 as previously traced'.` Theoperation oi relay 405 further establishescircuits from the brushes 219 and 220 to the sender apparatus. z

Two circuits are newY established tothe key-set illustrated in the lower portion off Fig. 2.. One is traceable from ground y through the windingsl of relays 400, 407 and 40S, coil 460, lower Contact of sequence switch cani 409, lett Contact relay 405, ter- ,eeo i Relays 218 and 402 are op#y A circuit is non estab-` ininal 254, brush 219, right Contact of relay 223, right inner `uornial contact oit relay 224, brush 212, terminal 201, left middle normal contact of relay 20G, conductor 225, right contact ot' `relay 227 which is operated upon the depression of any one ot' the keys in the key-set as liereina-tt-erdescribed.'` Upon the operation ot relay 227 the circuit is extended from theiright contact of relay227 to the upper contact ot a depressed key, to battery, the potential and polarity of the battery being dependentupon the key depressed. The other circuit extendsiiroin ground through the 4windings of relays 410 and 411, loiver ance With the Wanted` line thereby associating` heay i `or light,- positive and negative potential Withthe contacts oirelay227 connected to conductors225 and 226 inaccordanceu'ith the ltey depressed. Let it be as-i s'uniedthat thel i'iuniber of the `wanted line in the desired exchange is 2856. .The op-` erator depresses the` digit key 2 thereby con-` necting light negative battery roin conductor 230 through the lowerinost upper contact oi key 2 Ato the rightwoontact ot relayr 227. The operation ot key 2 further associates a heavy negative battery tti-oni conductor 281, loiver Contact of key 2te the lett inner Contact oli relay The Contact 2340i2 key No.2 closes atter the outer contacts have closed thereby completing a circuit 'orthe operation of relay 227 from `grounded battery through cont-act 234,.Winding ol relay 227 to ground.' `The relay 227 operates and connects conductors 225 and` 226 to the contacts a-.sociated with key 2 as 'cuit traced and establishes an obpreviously described and circuits are coin` pleted over conductors 225 andv 220 to` operate relays as liereinatter described. At ite left inner contacts, relay 227 opens the ener- 2gir/,ing circuitfor relay 22S to cause its release and extinguish lainp 229. This is in-v cidental in the operation of the circuit and does not serve as an indication to the operator. The operation ol' relay 227 'further establishes a circuit to light lamp 235 from ground through its lett outer Contact, filanient of lainp 235 to grounded battery. The lighting` of lainp 235 indicates that the operator` has. properly actuated the lrey. The

. .potential with conductor 226.

4energization ot relay No. 8 associated with brush 431. The inagnet Ai132 is energized troni grouiuled battery through the right upper contact-etree ueiice switch cam 428, resistance 4171, winding and associated contact ot switch 1niagl'net "e252, brush Si yand its associated coutactsin its nornial position to ,i ground through the right outer contacto't :clay i250. 'lhclsiiitch now rotates over its associated contacts until itis associated i'ith terininalS whichis opened at the niiddle Contact oit relayelSO. Since the switch magnet no `longer has an energizing' circuit at position 8, the 'brush L/- Bl is arrested iii its rotary nioycnieiit.` The fl-3U lurther establishes a circuit tor theV erg'ization otf sequence lswitch magnet alla) froin grounded "battery through its ii'iiiding, right upper contact ot sequence switch n.un Lil21 to ground through the .iiiiddlc contact ol relay 430. When the sequence sii'itch/-l-OO rotates out ot position 4t the locking circuit tor relays 1.16, 417 and .4l-53 is `opened at the upper contact ot cani ,414; to cause the deenergizalton o't theser relays.

The depression et the .next dgit key No.`

5 is nowieltective and associates heavy posii tirepotential with conductor and no YThe heavy positive potential establishes` an operating circuit tor relays 406,407 and OS which operate in ser'es with conductor Circuits are now established to operate relays 434i, #i353 and 48() ofthe upper chain ot relays. The energizing circuit `'tor relay 480 may he traced i troni grounded battery tl'iroiigli the uppercontact 'ot sequence `switch cain Ll-lll, winding ot relay 4180, upper vcontact ot sequence switch cani 475, contact ot relay e055 to ground through the lettcontact ot relay tlfl. The operation ot' relay i133 is troni the saine battery source.through itsv winding. upper contact ot sequence switch rain 429, right contact ot' relay'lli'l to ground through the contact ot relay 40T. rlhe energzing circuit t'or relay 43st is troni the saine liatterysource through `its winding upper contact ot sequence switch cani fl't, contact ol relay 40S to groundthrough the lett contact ot relay ll. The stepping iiiagiiet 42T controlling the hrusli is now energized Jtroia grounded liattery through the lett lower contact ot sequence switch canr 128, resistance l? winding and associated contact ot' inagnet 42T, brush 425 and its associated contact-in its normal position to ground through the outer contacts ot' relays 434. 433 and 480. Switch inagnet 427 is con# tiiiuously energized as hrush 41325 is asso-l ciated with contacts characterized hy ground through the contacts ot the relays. The cross connections are such'that. lirush '425 rotates to thelitth contact which is open and the rotary increment ot the llirush is arrested. "The energization otr-clays 4:80,

4133 and l-Sll further establishes lan energizing cLrcuit tor sequenceswitch inaguetOO from grounded hattery `through its winding, lett `upper contact ol sequence switch cani 421 to ground through the middle contactofsaid inlays. y The sequence switch .is thus rotated troni position 5 to position (5y and upoirthe rotation ot the sequence switch out 'ofiposi-r tion `the locking circuit tor relay 530,131

rthe lower chain is openedv thus causing its relcase.`

The loiirth digit, key depressed bythe operator is key No. 6 thereby associatinglight positive potential with conductor225 `to operate relays 407 and LlOS. y 'llheoperation ot these relays `estalilishes afcirciiitlto voperate relay 4t2() ot' the lower chain andthe oper# ation ol relay 42() reii'ioi'esground troni contact No. G in the `bank ot the tou'rtlifdigit switch associated iiiitli brush llof `"llhfeenergizing `circuit tor relay` 4t2() niay he y traced ilroiii grounded liattery through 4the right lower contact ol? sequence` switch Camela, winding oli relay i-20, lower contact ot sey qiience switch cain 1176, contact or relay 4:08

to ground through'the lettfcontact ot relay 413. rflic energizing circuit for .magnet e135 may lie traced troin groundedl battery 4through the right lower contact ot' cani `e128,

resistance 472, winding and associated `contact `otfniagnet. 435,` hrush ellt and its associated contact inits'norinal position to ground` through the outer contact ot' relay Brush 36 `is thus rotated `troni its norinal position to positionland continues to rotate upon its association with each con- Y ner, lirusli 451 is associated W'th vlirush `l, y

brushiel52 associated with brush 425 and lirush loo 'with lirush ,436. Thusin position 'i ot thc sequence sw1tch,`the counting re" lays are associatedthroughhrush 51.39 and thence through the upper contacts ot sequence switchcaiu a?? to ground on the contact of relay li317 which operates duringthe upiiiard nioifenient ot' revertiye impulse afutoiiiatic switch. The register or vdigit switches now reinain positioned awaiting the selection ot ancoutgoing""trunk leading to the exchange designated hy `the jack'into which the operator has inserted the plug.

The. selection ot a trunk is purposelynotef` tective until after tour dig;ts yoi' ther called nunilier hare Vbeen `recorded andftlie se quence switch $00 nioyredinto position v7.

""In this Way the trunk is `not, held busy unnecessarily during the registration of the Wanted line designation, as would otherwise be `the case it ths selection occurredsiinultaneously with the selection ot the jack.

Upon the rotation 'o'f the sequenceswitch to position? in the manner described, the

' high resistancewinding of relay405 is short circuited at the `lower Contact of sequence switch cam 401. Thecircuit path for this shunt circuit is apparent and need not bedescribed. It will be remembered that a circuit is established throughthe Winding ot' relay `224 "and the windings of relay '405 to operate relay 405'bu`t on account oi the high resistance of theiight Winding ot relay 405, relay 2,24 does not operate. The lshunt of the high resistance Winding of relay 405 nou' establishes a loW resistance circuit which allows suiiicient current to flow through the winding of relay to cause "its operation.` The operation of relay 224 establishes a circuit to oaerate rela 228 from @rounded batter through its Winding, leit inner normal contact of relay 227,l conduct`o12226, left outer4 normal fcontact of relay 200,`tei'minal 202, brush 213, `left inner` contact of relay 224, left outer normal contact `of relay 246 to ground through the segments of interrupter 265. Relay 228 is now repeatedly operated and released through the contacts and `seg `ments of the constantlyr rotating interrupter 265. `Eachoperation of relay 228 estab` lishes" a circuit to light lamp 229to indicate to the operator that the sender Vregister switcheshave been set in response to the op eration of the digitlzeys.` The operation `ot relay 224 further establishes an energizing circuit for switch magnet 240 from grounded battery `through its windings,"left outer contact of relay 224,rightiouter normal contact "bof, relay` `240 toground through the normal contact of relay 241. Brushes 242 to 245, in-

elusive, are nouT rotated over the contacts ot lts bank 1n search ot an idle trunk leading tokthedesired exchange. An idle trunkis characterized by grounded battery associated with terminal 253. When brushes 242 to 245 are` rotated to the position of an idle/trunk,`

anenergizing circuit is established for relayi241 traceable from grounded `battery through resistance 308, 1igl1t normal contact` of relay 300,1left outerinorinal contactol re-` lay `3,01, terminall253, brush 245,-` lett winding of relay 241 to ground throughthe right 'outer contact of relay'224. `The operation oit relay`241opensfwthe energizing circuit or switch magnet240 and ,thus arrests the ro`` tary movement of` its associated brush 1ncin-' bers. y, The operation ot' testrelay 241lurther establishes a `circuit to energize relay 246 from ground though its contact, `right Windingsf of relays246 and 241 and thence to grounded battery over `the operating circuit for relay 241. It will be noted that the operating circuit for relay 240 is in multiple through the right Winding oi relay 241 with `the operating circuit through the 'lelt Winding of relay 241. The ohinic resistance ot this path in series with brush 245 is thus rcduced in order that terminal 253 may he held busy to other link circuits seeking an idle trunk. This busy shunt remains associated With terminal 253 and brush 245 until relay "300 is operated to disassociate battery potential from terminal 255i. The operation olf relay`246 further establishes a locking circuit tor itself andan energizing circuit for relays 300 and 200 from grounded battery through the winding ol relay 300, terminal 252,`brush 244. lett winding and lett inner contact oi' relay 240, brush 214, terminal 203,

Winding of relay 200 to ground thrfiugh the upper contact oit jack 207.

The `operation ot relay 200 opens at its left inner contact the energiaing circuits for relays 211 and 210 to cause their release. The operation oi relay 300 opens the ener gizing circuit toi' relay to cause its rclease. The circuit `tor the stepping magnet 240` is held open `at the contacts of relay 240. rlhe operation. of relay300 further establishes an obvious circuit to operate rc` lay 301 which locks through its left inner contact to grounded battery through the contact of relay 302.

A trunltto automatic switches in a distant exchange such as indicated in Fig. irl has now been selected and preparcdiior oper ationas directed by the sender circuit shown in Fig. 4. As previously stated, the "automatic` switching apparatus at the distant exchange may be -oll the rcii'ertiiie impulse type, ot the saine general structure as shown in detail in PateutNo. 1,403,501 issued. January 1T, 1022, to iii; li). liuudell. Associated withfan automatic switch ott this type a cominutatfor diagraininaticallyl iiiilicatcill at 305. Upon the energizatien o'tthe switch to select an idle terminal comuuitator305 ner contact of relay 405, upper contact ot cam 412, left normal contact otrclay 430, iyiiiding of stepping relayell, upper conf tact ol sequence switch m1111405), left contact of relay 405, terminal 254, brush 210, right contact ot relay 22E-i, left middle contactant relay 240, brush 242, terminal 250 to ground iii?! lill lili.:

sie.

heb

'through the contact of sequence switch kcam The relay` 304 at the` automatic exchange and stepping relay 437 at the sender are both operated upon they establishment oit the tun lamental circuit. rllhe operation ot relay C5504 causes the selector switch to advance for brush selection. During this operation the conducting and non-conduct ing segments of interrupter 305 are associated with its contacts whereby ground is connected intermittently to the conductor 307 of the selector switching circuit. Each association of the conducting `portion of cominutator '305 with contact 309 establishes a shunt circuit around the winding ot relay 437 to cause its release. i y

lt will be remembered that the, lirst registcr switch is` set to associate brushes 424 and 439 with, the contact terminals in posh tion 2, l'jpon the operation of relay 437, a circuit is established to operate counting relay441 traced from ground through the contact ot relay 437, upper contacts of se-y quence switch cani 477, "brush 439 and its associated contact, contact of counting relay 440, winding of relay 441 to grounded batotrelay 441 to ground through the contact ot sequence switch cani 450. The operation v of relay 440 associates brush 439`with the winding of counting relay 443 which energizes upon a subsequent energization of stepping relay 437 over a circuitthe same as the energizing circuit traced for relay 441 with thev exception that itis carried through the normal contact of relay 442 and the contact ot relay 440. Upon a subsequent rclca e ot relay 4257, an energizing `circuit clicctive for relay 442 which opera-testo establish a circuit ior relay 445. A subsequent operation ot relay 437 energizes relay 44.3 and its vrelease removes the shunt `from relay 444 which operates and establishes :in obvious circuit to energize, the winding ol relay 4i-38. The operation ot relay 438 opens the 't'uiulalnental circuit andthus causes the release oitV relay 304 nponthe rotation ot interrupter 305 to a non-conducting segment. The release of relay 804 opens the energia ing circuit for the selector switch drive and thus arrests its movement. The operation of relay 4138 further establishes a circuit to energize sequence switch magnet 400. This circuit may be traced from grounded battery through `the winding of sequence Vswitch rnz'rgnet 400, lowercontact ot sequence switch cani 421 to ground through the right contact of relay 438. The

sequence switch is thus rotated from position 7 to position 8. In this position 4the sequence switch, the locking circuit for the counting relays is opened to cause their release. The release ot counting relay 444 opens'the `energiring circuit for relay 488 to canseits release. Upon the release of relay 4236, a circuit is established to energize sequence switch)l magnet 400 to rotatethe sequcnce switch trompcsition 8 to" position 9, lhis circuitlinay be traced from grounded batteryy through the winding of' sequenceswitch magnet 400, lower contacts of `sequence 'switch cam 478 to ground through the lett normal Contact of relay 438.

in sequence switch position 9, the tundamental circuit is again established to 'further control the switches at theV automatic eX- changc. It will bc noted that' inpcsition E), brush `451 is associated with the contact ot' stepping relay 437 through the lower right and upper lett contactsrot sequence switch cani 477. Upon the energization ot the switch at the automatic exchange the countingrelays are operated in the manner previously described until the ifuiidainental circuit is again opened at the contact of relay 438,

`Otherswitches at the automatic exchange "loperate in the manner indicated in response to the various digits set upon the registers "ot the sender circuit and the counting relays operate under the control of brushes 452`and 453 in positions 11 and 13 ot the sequence switch 400.

`Upon the completion of the control of switches at the automatic exchange, the sequence switch 400 is rotated vfrom position 13 by the operation of relay 438 and is restored to normal undcn 'the `control ot its 1 master contact 404. `Upon the rotation of the sequence switch out of positionl, the energizing circuit tor relay 405` is opened at `the lower contact 'of sequence switch cam 401. The release of relay 405 opens the circuit paths erztendingto the sender `and opens the locking circuit lor relay 402 to cause its release. During the rotation ol the sequence switch from position 14 to position 1, circuits are established lfroni grounded battery i through the contacts ot sequence switch cani 428, resistance 470,471, 472 `and 473, winde relays of the upper and lower combinations including relays 417 and 420. The sender register switches are thus restored to their normal positions.` The energizing circuit for relay 224 is opened at the sequence switch cani 401and releases at the same time as relay 405. The release o'trelays and 402 opens'the energizing circuit i'or relays 218 and 2";3 to causetheir release. The release of relay 224 establishes the talking circuit through its normal contacts from a disings of the register" switch magnets -toground throughthe normal contacts ol the lli liti

`,the talking circuit. During the period ot `tant` exchange to the tip and ring conductors oljack 207 and thence through the cord circuit BG-to the calling subscriber. The re lease of relay 223disconnects the conductors extending to brushes 219, 220 and Q21 from time that the talkingcircuit is held by the subscriber relays 246 andQOG are the only relays energized.

Upon the completion of aconversatioii, the operator at the A. switchboard is notified by the usual supervisory signal and removes plugs 261 and 260 from the jacks. The removal ot plug 261 from jack 20T opens the ciiergiiiingcircuit 'for rel-iii'.- Q06 and QelG at the manual ottico and relaiv Ifitldat the autoiiiatic oliicc which thereupon deeiiergize. The switch and associated circuits at the usual manner.

lVhat is claimed is: i

.1. In a telephone exchange system in which incoming lines to a manual exchange are extended to an automatic circliange over outgoing trunks, said automatic exchange being represented at said manual exchange by a plurality of sets ol terminals, an operators position, means at said operators position lor interconnecting an incoming line automatic oiiice restore to normal. in the and one of said sets of terminals, a commmi `cachange by a plurali@T` of sets ojl` tcrminais, operators positionsgneans at said oper` ators positions t'or interconnecting incoming lines and any` oli said sets oi terminals, a plu rality ot senders adapted to control the apparatus at said automatic exchanges, a coiniiion` switching device for selecting an idle sender, an idle trunk to a desired exchange and an interconnected Vset` of terminals,

moans wherehi1 said interconnection of a line with a set ot terminals actuates said switching device, and means for actuating a select ed sender.

:hln a telephone exchange system, in

coiiibination, lines incoming to a manual oitlice, outgoing trunks extending to switches at an automatic oilice, an operators position,

a `ljliiralityof jacks at said operators position, a cord circuit for interconnecting an incoming line and any one of said jacks, a' pluralityT of variahly operable senders, a coinnion switching device for selecting' an idle others ot saidplurali@T oit senders.

sender, anidlc `trunkand an interconnected jack, ineaiiswhcreby the interconnection of a line with a jack by said cord circuit actu ates said switching device, and means to actuate a selected sender to control the switches at an automatic otiiceover the selected trunk aiulconiiect thereto said interconnected jack,

Li. In a telephone exchange systeni, in coriibiiiation, lines incoming to a inaiiual olicc, outgoing trunks extending to an automatic office, au operators position, a pluralityot jacks at said opei'atos position, a cord circuit For intcrcoiiiiccting an incinning liuc and anyone ot said jacks, u iilifii'alitf,7 olli senders, a common switching device for lei-ting an idle. souder, au 'idle trunk and an iutciconiicctcd jack, `iiieaiis wlicrelrii tho intcrcoiincctioii oi` a lino with ajack` bysaid cord circuit actuales said switching device,

a calling device adaptedto be set in accord ance with the dcsigiiationot a desired line `lor controllingl a sender, and means to connect said callingr device with said selected sender. i

ln a telephone exchange system, incoi'ir bination, lines incoming to a manual ottico, an operators position, apliiiralitj,7 of jacks at said operators position, a cord circuit 'for interconnecting an inconiii'ig line with any one oi said jacks, a plurality ot senders, a common switching device for selecting an idle sender, an idle trunk and anintercon-` nccted jack, incanswliereby the interconnection of a line with a jack by said cord cir cuit actuates said switching device, `a calling device adapted to be set` in accordance with the designation ot a desired line for con trollingsaid sender, means to connect raid calling device with said selected solider, and

other means for disconnecting `said calling` device "in order that it magiT be connected to G. ln a telephone exchange s prising" an oiierators position, a plurality of jacks accessibleto the operator at said position, a common group oil outgoine'` trunks and a common group of senders, a link circuit comprising threeswitches. ono ot said switches being adapted to select :in individual jack at said oiicrators posi tion, a i c ond switch to selectau idle one ot said scnders, and a third twitch to select an idle one ot said trunks, and means at said o; icratoi"s position to actuatc said link.

'i'. In a telephone exchange system, in coinbinatioin lines incoming to a. manual ollice, outgoingtrunks extending to an automatic ofiice, an opcrators position, a plurality ot Jacks, a cord circuit i'or interconnecting an incomingline and any one of said jacks, a

pluralit)7 ot register senders, a link circuit comprising three switches, one of said switches being adapted to select an interconnected jack, a second switch to select an idle llt] llfi

sender, and a third switch to select an idle trunk, means whereby the interconnection of a line with a jack by said cord circuit actuates said link, a calling device adapted to be set in accordance with the designation ot a desired line for setting the registers of said selected sender, and means to prevent the selection of an idle trunk until the registers of a selected sender are completely set.

8. In a telephone exchange system, in combination, lines incomingto a manual otiice, outgoing trunks extending to an automatic oiice, an operators position, a plurality of jacks, a cord circuit for interconnecting an incoming line and any one of said jacks, a plurality of 'register senders, a link circuit comprising three switches, one of said switches being adapted to select an interconnected jack, a second switch to select an idle sender and a third switch to select an idle trunk, means whereby the interconnection of a line with a jack by said cord circuit actuates said link, a calling device adapted to be set in accordance withthe designation of a desired line for setting the registers ot' a selected sender, means to prevent the selection of anidle trunk until the registers of a selected sender are completely set, a signal, means to operate said Signal in one manner to indicate that the trunk selecting switch is in operation, and means to operate said signal in a different manner to indicate of common switching devices each'eomprising K- three switches, one of said switches being adapted to select an individual jack at said operators position, a second switch to select` an idle one of said senders and a third switch to select an idle one oi said trunks, means whereby the interconnection of a line with a jack by said cord circuit actuates the idle ones of said plurality of switching devices, means operable through the selection of an interconnected jack by said jack selecting switch to arrest the movement of the jack selecting switches in all of said plurality of switching devices, means actuated upon the selection ot said jack to select an idle sender, means to select an idle trunk and means in said sender to actuate said trunk selecting means.

In witness whereof, I hereunto subscribe my name this 12th day of December, A. D.,

GERALD DEAKIN.

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