USRE17839E - powell - Google Patents

Description

W. T. POWELL INTEROFFICE TRUNKING SYSTEM oct. 21, 1930.

original Filed Dec.

4, 1920 4 Sheets-Shea?l l INVENTOR WWW-RED T. POWELL ATTORNEY Re. 17,839 k Oct. 21, 1930. w. T. PowLL.

l INTEROFFICE TRUNKING SYSTEM Original Filed Deo. 4, 1920 4 Sheets-Sheet, 2

INVENTOR WWFRED 1: PUWELL Oct. 2l,A 1930. w. T. POWELL INTEROFFICE TRUNKING SYSTEM Original Filed Deze; 4 Sheets-Shet 5 nro. .2.5

l wmrREntPowEu wpd E Pwd( ATTORNEY Oct. 2l, 1930.

W. T. POWELL l INTEROFFICE TRUNK I NG SYS TEM Original Filed Dec. 4, 1920 4 Sheets-Sheet 4 Illli dvknwu avanzar mvENToR WWW-RED T. POWELL wif/Wi ATTORNEY- .WINFRED T. POWELL, or ROCHESTER,

Reissued Oct. 21, 1930 UNITED STATES PATENT oFFlcE- NEW YORK, ASSIGNOR TO THE STROMBEBG;

CARLSON TELEPHONE MANUFACTURING COMPANY, OF ROCHESTER, NEVI-YORK, A.

CORPORATION OF NEW YORK INTEROFFICE TRUNKING- SYSTEM Original No. 1,502,917, dated July This invention relates to telephone systems and more particularly to systems having a plurality of oices or exchanges.

In former telephone systems, when calls originated in one oflice for a subscriber at a distant oiice, an operator known as an A operator, connected the answering 4end of her cord circuit to the line of the calling subscriber and received the designation of the wanted line from this subscriber. The A operator then depressed an voffice key by which her telephone set was connected to an order wire leading to the distantwanted oice over which wire the A operator repeated the number of the wanted subscriber to a B operator at the distant office who assigned a trunk for use in completing this call. n The A loperator then inserted the calling end of her cord circuit into the jack ofthe assigned trunk. rlhe B operator after'receiving the number of the wanted line proceeded to test this line and, if idle, inserted the calling end of her cord circuit into the multiple jack of the wanted line and signalled the wanted subscriber. The use of such an order wire has resulted in much delay, and great confusion resulting from the errors due to repeating the number thereover.

The present invention has for its purpose the elimination of the order wire and provides in its stead automatic means for assigning an idle trunk to the vdistant office as the result of the operation of an oifice key and automatic. means indicates visually the designation of the automatically selected trunk, so that the A operator can connect the calling end of her cord circuit to the assigned trunk. At the distant oilice the B operator is informed of the number of the Wanted line by means of signals variably operated from the A operatorvs position.V

The main feature of .this invention is'the arrangement of circuits for the manual interconnection of subscribers lines terminating at different exchanges or oices without the use of the so-'called order or instruction telephone circuits vbetween the operators at said exchanges. n

Another feature of this invention is the provision of means vfor automatically assign- 29, 1924, Serial No. 428,225, led December 4, 1920. Applicatonfor reissue filed AprilV 6, 1826.

Serialy Noy 100,191, l

ing an idle trunk to a wanted exchange in response to the operation of a key individual to said oliice and means for automatically indicating the trunk assigned.

Another feature of the invention resides in the means for registering the designation of a wanted line on registering means located at one oiiice and for automatically repeating such registration at a distant oiice to variably and selectively actuate indicating means at the distant office.

Other features will. appear from the detailed description andy appended claims.

The drawings, with Figures 1,".2 and 3 arranged in the order named and with Fig. 4 placed belowFigs. 1 and 2 so that' the lines thereof meet, diagrammatically represent a portion of a telephoneV system employing the present invention, The circuits shown on Fig.v 1 and' at the left of the heavygdashed Vline ofFig. 2 and the circuits of Fig. 4, represent aportion of the equipment located at one office while that portion of the drawings at the right of the heavy dashed line of Fig., 2 and those shown in'F-ig. 3 represent the circuits of a second otlice. At the upper left hand corner of Fig. 1 there is represented the sub-station circuits of'a calling subscriber as well as a portion of an A operators cord circuit. At the lower left hand corner of Fig. Ithere is represented a set of ten numerical keys and it is to be understood that there is one set of these keys at each operators position. At the middle'and upper portion of the sheet of Fig. 1 there is represented a switch referred to as a link finder of which there is one such switch for each otlice key at each operators position. At the center and right of Fig. 1 therer is represented a trunk finder switch and a sender finder switch, the brushes of which are connected togetherby a circuit referred to as a link circuit which link is located by the link finder. The trunk finder functions toselect any idle one of a group of trunks to the wanted ollice, while the sender nder locates a sender ofthe common group of .senders which has been preselected'by a preselector switch shown at the bottom of Fig. 1.

At 'the lower right hand corner of Fig. 1

`and the left-hand corner ofiFig. 2 there is represented a progressively movable switch, herein referred to as a sender switch, While 1n the lowerpart of Fig.`1 and in, Fig. 4L

there lare shown the relay registers for storing up the designation of the thousands, hundreds, tens, units Aand stations designation.` r11-At the upper left-hand cornerl of Fig.` is shown a portion of an inherein designated Mannil dicating board common to a plurality of operators positions and of'` which therev lis one such board for each"oflice reached Ifrom they` first, mentioned office. Qn this Board there are located"` ai., plurality,` of.' lamps for indicating the tens and units designation ofvany automatically assigned trunk teva-twanted.. office. .At the center of Fig. 2 there --appears a progressively movable switch, herein referred to asa receiver switch 'andat the upperportion of Figs.f2 and 3,

there appears a representation ofthe Beperator7s cord circuit, while at the lowerpart ofFigs. 2 and 3 thereisrepresented the line indicatorvlamps and they relays forlcontrolling the same.k f

It will be understood 4thatthenumber.

oftrunkssuchgas that showngat the upper portion4 of Figs. 1 and l2 will.,vary in accordance with" the `traiic between the: rvarious oiiices, similarly the number of senders fol-the .usef of all; A `operators positions loy cated .at the 1- same oiiice willdependfon lthe number of lsiinultaneous callstherefrom,y

It isbelievedfthatjthe invention will best ,v bennderstood by describing themethod of operation employedin establishing a telephone connection from the sub-station of a calling `subscriber indicated at A to the substation of awanted subscriber, ,BQ Whose tel-A ephone line terminates' in another exchange .Y When the calling subscriber removes his receiver from its switchfhool,I the line .relay 5 isy operated in ythe well* known t mannerr to i light the. line lamp-6*. The Ay operator then insertsthci kmay bevconnecztedfto the callingline through the-operation-,odwell known automatic connesting means so that` the operator may inquire/the designation ofthe Wanted subscifiberisilrine.l i n y For purposes 'of "this description, it has `been; assumed that the line of the `wanted sub-` scriber terminates at ythe ,Mainl exchange and that its designation is 7764-R. The" A operator then presses the oiiice ley Aof the "Main7 otiice, herein designated 12, which is effective to close a circuit from ground at the armatureandbacl; contact of relay 13, lower armature .and back contact of ductor 16, contacts of theoiiice key 12, upper winding `ofi relay I17 to"`r grounded battery.y

The relay 17 attracts its arlnaturefas the resuit of theelosnre of this circuit and closes f a locking circuit for itself from ground at its innerupperarmature and front contact, its lower winding, continuity springand contactof relay 18, contacts oi" Wipeout key 19,l

winding of relay 14, armature, backcontact randwinding of, the` motor magnet I2Q of the sender'` p reselectorto grounded, battery.

The motor magnet will not operate in series n with the mentioned'relays,but the relay 14 is actuated and the relay .17` is held operated in ythe last describedcircuit. As soony as ,relay 1.4 operates, itcloses multiple actuatingcir# cuits .for `relay 21,A which connects; the` opera,-

torsfnuinercal key set to the preselected` sender and the key` set lamp'22which indi` cates this connection. These circuits ,extend `from groundedbatteryQwindingo relay 21;,-

lower i'ront contact, and, armature yof relay 14, back` contact and armature of lrelay `13 to ground. The lighting yof the key set lamp indicates tothe operator, that thedigits `keys appearing at the lower leftfhandfcorner of Figure lmay be operated in accordance with relay 14, conn the. designation'of4 the wantedy number.4 The operation ofrelay y 11i also` closes a circuit-for actuating relays 23 and25yinseries, this circuit extending fromgro-und, winding-of relay 28, upper ,front contact and armature oi"` relay 14, sender preselector brush 24 andwindfing yof relay 2`5-togrounded battery. Theop- ,y

eration of relay 25 closes atits armature and front contact, a circuit yfrom ground over conductor 31, armaturefand baclr contacts yof relay32 and the rswitching relays 27, 28, 29

and! 30 of the stations, units, tensandhundreds registers, over conductor 83rightfhand i winding of the thousands register switching relay 2,6, conductor 3ft, to grounded battery for actuating relay 26. y

When relay' 17 attracts itsarmatureathe operating and testcircuits ofthe'linl finder,

individual to the group. of. trunks assigned ,to

the Main7 oftice, are: closed, The operating circuit the `li'nl*L finder is closed from grounded battery, resistance, armatureand contact 124 of relay 175bag-cli?,` contact, .armature kand Winding' oflinotor magnet 42,0011- tinuity spring andy each ,cmf'rtact` of relaygO to ground,r and advances the brushes yuntil an` idle linl; circuit whereupon the testcircuit is coinpletedffrom groundat the make-busyrrelay 36,.,rightfhand back contact and armature offrelay 37, con# ductorBS, backconrtactand armature ofy relay 39 test brush, `right-hand Winding of relay 40, front Contact and armature of relay 17, conductor 41, resistance to grounded battery. This last named circuit is effective to shunt the motor magnet-42 of the link finder which then stops its brushes 43, 44, and 45 in engagement with the terminals of an idle link circuit.v The relay is operated in the last described circuitV and closes a locking circuit for itself from ground, winding of relay 39, holding brush of the link iinder, left-- hand highresistance winding of relay 40, its inner armature and continuity spring,.winding of the motormagnet 42, its armature and back contact, lower front contact 124 and armature of relay 17, conductor 41 and resistance to grounded battery1 The operation of relay 39 renders the chosen link unselectable.

lAlso when the relay 39 is operated, it closes operating circuitsfor the trunk finder switch and fort-he sender finder switch, the iirst oithese switches being advanced in a circuit completed from ground, upper contact and continuity spring ot relay 47, winding of inotor magnet 43 of thetrunk finder, its armature and back contact, inner front contact and armature of relay 39, outer back contact and armature of relay 37, through the resistance to grounded battery. Under the control of this circuit, the trunk iinder switch advances itsbrushes 50,51, 52, 53 and 54, until its test brush 54'engages a test terminal having ground potential applied at the lefthand armature and back contact of relay whereupon the circuit is closed through the lower winding otn relay 47, front contact and armature of relay 39', back Contact and armature of relay 37, resistance to grounded batterv. v

This circuit is eiiie'ctive to stop thetrunk iinder and also to energize the relay 47 which thereupon closes a locking circuit for itselt from ground at the armature and back contact of a relay similar to 55'at another trunk over the multiple connection 218, lett-hand winding of relay 55, holding brush 53, high resistance winding of relay 47, its upperV armature. and continuity spring, winding ot' motor magnet 48, its armature and back contact, to grounded battery through the contacts and armatures of relays 39 and 37, as previously described. y

In the event that all the trunks leading from the terminals of a trunk tinder are busy, all the relays such as 55 ot' this group of trunks will be operated, thus removing the short-circuit from the common makebusy relay 36, permitting this last named relay to operate and disconnect the stopping ground potential from all the test terminals at the link finder switches, thus preventing anyl link findertrom selecting a link circuit having no `availableoutgoing trunk at the trunkinder switch.

The operating circuit of the sender finder is traceable from grounded battery through the resistance, Vouter right-hand armature and front contact of relay 39, back contact, armature and winding of the-motor magnet 56 of the sendentinder, continuity spring Y and contact of relay 57 to ground. `This last described circuit causes the motor magnet 56 of the sender iinder to advance brushes Y58, 59, 60, G1 and 62 of this switchv 'until it reaches the same sender to which the key set is connected by way of the preselector switch.V At this time, ground at the armature and front contact of relay v23 is extended through brush 64 of the Asender preselector, test brush 52' of the sender iinder, upper winding of relay 57, outer right-hand front Contact and armature of relay 39 and resistance to grounded battery. :The relay 57 is thus actuated and at its lower contact and continuity spring opens the energizing circuitof the motor magnet 56iand linstead closes a circuit from grounded battery, outer armature and front contact of relay 37, back contact armature and winding of motor magnet'56, continuity spring and armature of relay 57, through the high resistance winding'ot this relay, holding brush 61 of the sender tinder,windingof relay 65 to ground. The operation of relay 65 closes an actuating circuit for relay 25 and simultaneously applies ground potential to the sender preselector brush 24thereby short-circuiting the relay 23 to remove the stopping ground potential from this terminal of the sender finders thus making this sender busy. It will be seen that the relay 25 will remain operated asv long as the relay 65 attracts its armature and thus controls the locking ground :for the relay registers and also controls the release of the step-by-step sender. it willbe remembered that earlier in this description it was stated'that-the relay 21 attracted its armatures to connect the set of numerical keys to the registers. The appa.- ratus is now in condition to receive the designation of the wanted telephonel line.

Since it has been assumed that the Wanted number is 77 Gli-R, the operator will thereupon depress the No. 7 numerical key of the key set to close a circuit from ground, spring contacts 75, conductor 76, innermost lower armature and front contact of relay 21, brush 77 of the sender preselector switch, left-hand armature and front contact of relayQG, lower winding of the sensitive relay 7 S and lower winding of the marginal relay 79, winding of relay 80, to grounded battery. Relays 78, 79 and 80 all operate in series and the first two mentioned relays close locking circuits through their upper windings, front contacts and armatures, through. conductor 31, front contact and armature of relay 25, to ground. -The operat-ionot relay 8O closes an energizing circuit for the relay 81 from battery, through its right-hand winding and through the armature and continuity spring of relay'80, to4 ground. n Relay 81/tliencloses a lockingv circuit through the'left Winding `of relay26 to'grounded kbattery over conductor A34k. lVVhenfthe No. 7.1k`ey is released, relay l 80 retracts its i armature and thereby closes a' -holdingcircuit `for relay 81 which extends from -groundatrthe continuity spring and contactxlofrelay 89, left-hand winding, front Contact,andarmature of relay 81, armature 82 and front contact of re1ay26,righthand winding 'of 'the hundreds register switching relay 30 to grounded ybattery'for operating this'relay.` The primary locking circuitfor n relay 30* extends` from grounded battery,-

left-hand"Winding-*front contact and armature ofrelayfoonductor 83, to ground at armatureandcontact of .relay 81. The relay on'operating closes a second locking cir? cuit for itself from'. grounded battery,`

through its right-hand Winding, `front con-` tact and varmature and through theback con.- tacts andarmatures of relays 29, 28,27and 32, over conductor 31 to theholding ground at the armature' andv yfront Contact of relay i 25'. This last describedcircuit alsois'eifectiye to short-circuit the left-hand winding' of relay 81,` softhat this last named relay deen'ergizes and retractsf its armatures;` The deenergization ofA relay 81 opens the holding circuit `for thethousands register sjwit'cl'i-` ingv relay 26l which' extended `through the left-handwinding, front Contact anclfarniature,..to groundatzrelay 81.` The switching relay y26 thereupon. deenergizes and disconsf nects the thousands register rela-ys from the controlof the numerical? key set, but relay ySOjlias already extended this key set to" the four relays of the hundreds register. Since the hundreds digit of the wantedlnumber is 7, the operator lagain depresses keyLNo.;7 to` closeafcircui't" from ground,r keycontact 75, conductor 76,?inner lower' armature and; front Contact of relay 21, sender preselecto'r brush 77, conductor 93', armature 86y and front Contact of relay 30, lowei'windings of sensitive` relay '87yan-d. marginal relay 88, Winding of relay 8O,` to grounded battery.:

` Relays 84?, 88 and k80are operated and the registerrelays 87 and 88 close locking' cirr-y cuits through. their upper windings', front contacts andarmatUresOVer conductor 31,1 to ground at the contact and armature of re lay When key No; 7 is released, relay 80'deenergizes yand againcompletes a: lock- .Y ing circuit for relay 81' (which Wasenergize'd' simultaneously with relay 80') from' ground y at the continuity, spring and contact of relay 1 f 80,.winding rof relay 81, its frontcon'tact `and armature', armature 82and back Contact of switching relay 26, armature 88 and front contact -o relay 30, right-hand winding `of thel tens registen switching. relay ,29'v to 1 grounded battery.y The vswitching relay 29 ,attractsfitsa.armatures and closes two` look"-A ing circuits. for:` itself; ythe firstextended from grounded battery, through its left hand: Winding, front contact and armature, conductor 83, outer armature and front con= tact of'relay 81 to ground, which circuit insures that the relay29 will be held by its second locking circuit including its right`- hand winding, front contact and armature through the back-contacts and armatures of relays 28, 27 and 32 over conductor 31,-to"

groundi The tens register is now in condi- 'tion` to be adjusted in accordance with the tens `digit. of the Wanted number; which in `the case assumed isf.- rEhe operator there#L uponfdep'resses key' 6 yto close vone circuit from f ground, through the resistance, key" contacts 90, conductor 76, innermost arma; ture and frontycontact of relay 21, sender preselector brush 77, conductor; 93, armature gaand front contact of relay ,29, lower Windings of the 'sensitive register relay 95 and marginal relay 96, through the Winding of relayg8'0, to grounded battery# The sensi;

tive relay' 95 and the relay 80 are energized inthi's series circuit'but the marginal relay 96 `remains inert.r On the'operationof `relay `95, ay locking circuit` is closed through its upper winding, frontA contact and armature, over conductor 31 to the holding ground. Then the operator depresses numerical key No. 6, a second cireuitis closed from ground, resistance, key contacts 90, conductorv 91, lowerniost armature and front contactvof relay 21, senderpreselector brush 92, con.- ductor 85,v outermost armature' and front contact of the tens switching relay 29, upper kwindings of ,the ysensitiverelay 227r and inarginal. relay 228,y conductor 103, toy grounded battery through the winding of relay 80. The marginal relay 2281 does-not operate in rthe circuit but the sensitive relay 227 is ene i ergized and closes a locking'circuit for itself through its lower winding, front contact and armature to' the holding ground. of con# ducter'l. @n thei energization ol' relay 80, an operating.. circuit is 1 closed through the right-hand winding ,ofrclay 81 for operat ingit: jThis closes a vtemporary holding circuit from `ground at the `outer front- .contact and armature of relay 8l, conductor83, ar

mature, front contactand left-hand Winding of relay l29,\to grounded battery over conductor w42k This circuit insures that the relay 29 willl remain energized, untilits lock`-` ing` circuit through its right-hand winding` is completed. `l/Vhen the" numerical key No.: 6l isre'lea'se'd,y relay 80 de'energizes and loch-` in'g. 'circuit'.` is closed-through the' left-hand digit of' the wanted number which, in this instance, is No. 4. The operator now depresses numerical key No. 4 and thereby closes circuit trom ground. through the contacts 98, conductor 99, upper armatureV f' Since the wanted subscriber isl party R, the

operator presses the party key for this party which, in this instance, is the same as the numerical key for No. 3. On the operation 'of this key a circuit is closed from ground,

resistance, key contacts 104, conductor 76, innermost armatureand front contact of relayY 21, sender preselector brush 77, conductor 93, armature 105 and lfront contact of switching relay 27, lowerwindings of sensitive relay 165 and marginal relay 226, through conductor 103 and winding lof relay to grounded battery. The marginal relay 226 does not operate in series with the mentioned resistance, butthe sensitive .relay 165 attracts its armature and locks itself operated through its upper winding, front lcontact and armature to ground, over conductor 31. f

In the event that the wanted number is an individual line without the party letter, the o'perationof the start key 108 functions the same as operating the key for party 'J which key Yoperates relayv 106 ci". the stations register. This will indicate to the yB operator that station J Vis wanted and, when she operates the ringing key for party J, 33 cycle ringing current .is'selected which will sign al the individual line. It will thus be seen that when the start key is operated on a call ttor al party lineother than party J,

rela-y 106 will not be operatedY because of Y the tact that the operation and release ofa key to operate a relay of' the stations register releasesthe relay 27 so that any subsequent operation of the vnumerical keys will not etlect the adjustment of any Aot the registers.

After the A operator has adiusted the numerical registers in accordance with the designation of the wanted number, the start key 108 is depressed and held until the indicator pilot lamp 109 of Fig. '1. islighted lThe lighting kof the lamp 109 'iseifectedr by the closure vot theV circuit including `the conductor V111 which is closed at the left-hand armature I and :trout contact of relay 110 which relay is operated will now be described.v 'On the depression of the start key, a circuit is closed from grounded battery, resistance, upper Contact ot start key 108. winding of relay 18, y

conductor 112, outer lett-hand armature and front Contact of relay 40 (which it will be remembered was energized as soon as the link under ci 1 had seized an idle link), lefthand winding of relay A110, `through the back contactsl and continuitysprings of other relays similar `tov relay 110 ot' other positions located at link finders ,operated from `the Main oiice keys, to ground. AIt will thus be seen that if no .other operator has a start key similar to 108 depressed von a.V call to the Main7 otlice, relay-,110 will operate'and lock itself operated through its continuity spring, armature and right-hand winding and uppermost armature and frontcontact of relay 17. Relay 110 on attracting its armatures breaks the series ground circuit which is arranged so that no other operator .can

"disturb the connection under completionuntil the operator in attendance on the present call has released her start-key and then only one Aoperator can ei'ectthe operationv of the relay corresponding to 110 at another positionj. When 110 attractsits armatures in the manner described, it'closes a circuittolight theindicator pilot lamp-,as :previously ldescribed which inforins the operator that the cord circuit in her positionis associated with the common indicator board shown in thel vcloses an actuatingrircuit for relays 37,

116 and 117 extending iromgrounded battery, right-hand winding ofrelayv 37, inner- Y most front contact and armature of relay 113,

uppermost` fronti contact 'and armature of relay 47, armature and backcontact of relay 115, trunk finder brush 52, winding of sensi'- tive relayllG, winding of marginal relay 117,

front contact -and armature of relay 55 which was'en'ergized in series with relay 47) to ground.` The operation"A of relay 117 is eective to light the-tens and units lamps on the indicator board to indicate the trunk designation of the'trunk assigned .for use, into the jack of' which 118 the operator-Will insert'the callingplug 119 other cord circuit. In the drawing, this trunk is shownas rtrunk No; 12 andthe marginal relay 117 completes circuits to light the tens lamp 120=and the ll) i units lamp 121. On receiving this number indication,y the operator inserts the calling plug-119ofthe cord circuit taken' for use into f thejack 118 and releases the start key108` y which extinguishes the lamps on the common indicator board as will be pointed out. When the start key 108 is released, at its upper con.-`

tacts .y it yopens the circuit which has been `locking the relay 17 operatedand since'the relay `18 is slow to releaseits armature, the original locking circuitof relay 17 is open at the continuity spring and contact of relay 18. 'Therefore-r the relay' 17 deenergizes and as soon asit retracts its armatures, it opens the locking circuit yfor relay 110 which extended throughthe uppermost front contact and ar- .in .use arefnovv in normal condition and in readiness for use on a subsequent'call. h y #When relay 113 of the trunk finder is re.- leased, as .above described, the lovvresistance Winding of relayA A37 is ,disconnected from the* windings ofthe sensitive relay` 1.16 and ymarginalrelay -117 of the trunk circuit. -Relay 37 and "relayl 1.16, however, do not deenerf Ainthis .circuit,` lthe marginal relay 11.7 de.-

gizeybecause of `a circuit extending from" grounded' battery .through botlil windings iii "series 'ofrelay-B', its inner front contact and.'

armature, varnriati'ire andbackcontact of relay-115, finderbrush `52,y relays 116 fand 1,17, to ground at .i the front contact and armatureof relay 55. Because of the high Eresistance Windlgof relay 37.1'1cw included energizesf'andextinguislies the lamps onfthe A,indicatorboard Which have `been lighted for indicatingthe'trunkl assignment, 'Relay 37 fnow holds thetrunk 4finder busyand also causes the sensitiverelay`1`16` ofthe trunkr` `andthe"relay 570i the leender, finder `to remain'operated. Sincev they calling plug 119 ofthe operators cordk circuit, `isin` engagement `with' the jackl contactsy 11S-,ofi ftruifilrwllo.D 12,'the relay ishovvnattheriglit of Fig; 1r

"is held `operated ronr grounded battery,

i @through thesleevecontacts of the .mentioned .Y plug; and ack `andl Winding' of 'the relay.` 55 to `ground 'over conductor' 21,8, atdthefarmatu-re an'djbackcontact'of a relay similar to at.

another trunk"of'thi's'r group; Relay wliile operated," indicatesy that trunk No. 12- is in "usexff f bof fan. operators position such as. thatl shown 'at the/lower lefthandfc'orner of. Fig. .1 isre- `leased,it `i'sjimtnediately connected toy an. idle registerfsender ofthe common `,groupwof L fregister `senders offwhich there are only enough'v provided 'to handle. `simultaneously calls to allA oiices, duringfthe interval that .transpires between the depression of the of-L tice -keryibyfthe Aoperator, until the number indicationlias been transferred lto the op? erators number indicator It Will be recalled that When relay 18Was energized at the close of the 4operation of the numerical keys, relay 14 deenergized. This closed an energizing c-ircuit for relay 13 as long as preselector brush 24 tested test contacts having a busy potential applied at the armature and `front contacts ofrelays similar to f relay 65 at 'engaged register senders. With.

relay 13 operated, motor. .magnet 2OI advances the `preselector ter sender.

I As soon as the'number has been set upon the'key sety in the manner indicated and when the start key is ..0peratefl,v thel operator` receivesfthe. trunk assignment by the `lightling oftrunl` indicator lamps, such as 120 and 121 on the commonindieator board and thus it is not necessary -orf'thisy trunk assignment` -to "be transmltteclto `the A operator from 'the'B opierators positionover anorder Wire.

w `It..jvvill be understood that the; registers of a-.iregisterl sender .remain adjusted to store upwthe numberfdesignation of the` Wanted niimber untili the B operator is inv readiness to receive this'y indication 'on'.thef number 1n.`

dicator shown. at ythe right of Fig. 2 and at thelower partof Fig. 3,. thus it is" not necesf. sary for. the Aoperator 'to repeat the wanted.

number tothe Boperator. It will vbe pointed out in this description `how ythe Wanted num.- ber 1s displayed 'on'. the indicator at the rB brush to select an idleregissof position. untilltheB operator is in readiness vto `attend to thefcall` and it remains as af visu-al indication of the `Wantednumlocr un.- til the, By operator extinguishers the ope-r.-

Aatednumber indicatingflamps either by operating a common release. key 125. orby insert-ing the plug 126 into a. multipleiack127 of' the wantedv line.

The Boperator receives an indication that Va' connection 1s Wanted over selected'trunk No. 12 when the A. operator ".depresses the sta-rt key 108 of Fig. 1, which operation closes acircu'it` from ground, .Winding of relayf129 of Fig..2,sender1brush 130 `infits normal position,..conductor 131, sender iiiider brush 60, lovvermost front contact andarmatureof` relay 57, conductor 132, trunk finder brush 50,"..upp'ermost lfront contact and armature l Aof relay 116, tip icondructorl of the `assigned trunk," .uppermost armature and" back Contact of relay 184;', Winding of the repeating coilv and windingof relay 135, to groundedbatteryhr Relays129 and 135 are both operated,v relay 129 closing acircuit to advance the sender switch into its Zero .positit'nrl This circuit istraceable from ground, armature i and front contact ofilfrelayl 129,.. sender br b 1:36 ,conductor 1.37 back contact,armature and winding of motor magnet 126 of the sender switch, to grounded battery. .The operation of relay 135 closes a circuit for operating the slow releasing relay 138' and this relay connects the lamp 139 in circuit with the intermittently closed contacts 140 of the common flashing device, this circuit being traced from grounded' battery, through the lamp 139, inner' armature and front contact ot relay 138, armature and back contact of relay 141, 'conductor 142, contacts of the flasher 140, to ground. On noting that lainp 139 is intermittently lighted. the operator presses the assignment key 143 and thereby Vcloses a circuitfor operating the relay 134 which extends from ground, through the contacts of this key, upper winding of relay 134, conductor 144, receiver brush 145 in its normal position, armature, back Contact and winding of the motor magnet 146, to grounded battery.v This circuit is effective to cause the energization of the relay 134 which the-ref upon closes a locking circuit for itself irom grounded battery, contacts on the release key 125, conductor 147 winding of relay 148, conductor 149, lower winding, front- Contact and armature ofrelay 134, conductor 150, to

' ground at the inner armature and back contact of relay 151. The guard'la'mp 152 is energized in multiple -with this last described circuit. Relay 148 is operated yin the locking circuit -just described and 'closes an operating circuit for the motor magnet 146 ofthe receiver switch to advance it into position '1, This circuit is traceable from.

lgrounded battery,v winding oit/motor magnet 146, its back'contact andfarmature, receiver brush 145 in its normal position, right-hand vfront lcontact and armature of relay to ground. As soon as the receiver switch moves 'out of itsnormal position. no other relay such as 134 can be operated by falsely press-v ing another assignn'ient key,because the battery 'potential throughf the ywinding 'of the motor magnet 146 is removedfrom these relays when the receiverswitch leaves its normal position. The operation of relay 134 also disconnects the tip and ring conductors -133 and 153 frolnthe Bf'operators cord circuit and connects these conductors to the brushes 154 and 155 of the receiver switch. The opening of conductor 133 causes relay to'deenergize and also e'lectsthe deenergization of relay 129, which in turn advances the sender switch into position 1;

It willnow be explained'how the receiverL and'sender switches are advanced step-bystep in synchronism and how the number d esignation recordedv on the relay registers at the Aoperators position is effective to actuate corresponding relays at theV B operators position of the wanted otlice. The stationsdesignation is transferred to the lrelays of the B operators position iirst so that this operator 'can depress thestations key Whilethe remainder of the wanted number designation is being received. Since the receiver and sender switches step alternately and since each switch must complete twentyone steps to effect-the number designation at the registers of the B operators position, the total number of steps taken by both of these switches is forty-two and will require about one second of timeto display the complete designation of the wanted line, after the B operator presses the Vassignment key 143.

It willbe remembered that the sender and receiver switches are each inV position 1 so that a circuit is now extended from ground,

Winding of relay 160.` conductor 161, brush 154, uppermost front contact and armature of relay 134, tip conductor 133 of the selected trunk, uppermost armature and front contact of relay 116, trunk inder'brush 50, conductor 132, lowermost armature and Jfront contact of relay 57, sender finder brush 60, conductor 131,'brush 130 in position 1, conductor 162, upper front contact of relay 106, but,

`since relay 106 was notY operated, this rcircuit is incomplete at this point. At this time a circuit is closed from ground through the low resistance winding of relay 166, brush 155,`inner upper armature and front-contact of relay 134. ring conductor 153, of the trunk selected, inner upper armature and front conv tact of relay 116, trunk finder brush 51, con-- ducto-r 167, armature andfront vcontact of relay 57, sender linder brush 59, brush 163 in position 1, throughboth windings in se-` ries of relay 169, to grounded battery. Y he relay 166 will not operate in series with the high and low resistance windings of relay' selected trunk through brush and low resistance winding 'of the relay 166,H to ground.V Relay 166, is energized in this circuit and causes the motor magnet 146 of the. receiver switch'to be advanced in .a circuit traceable from'grounded battery, winding, back contact and Aarmature of this magnet, brush 171 in position 1, front Contact and armature of relay 166, to ground. In position 2 of the receiver switch, the relay 192 is connected tothe stations register of the A office over a circuit extending from grounded battery, conductor 231, winding otl A relay 192, conductor 232, receiver brush Y154 iny its second position, uppermost front centact and armature of relay 134, tip conductor through both highand` lowresistance wind' y ings of'relay 166, to ground'. `The relay 166 deenergize-s yand thereby completes; a circuit `forthe motor magnet A"1461 to "advance theyre-*i Cei-ver switch into position.- Asvsoon asthey 13.3, 'ofthe ,selected trunk, upper larrnatu,re and -front `contact of relay 116,tr.ui1l{ inder bnushO, conductor 132, 4lowerrnost arlnat and trent .contact of `relay '57, sender in'der brush 60, conductor 131;, sender switch brnsh 130,k `in itssecond position, conductor ,234,

but this ,circuit is incomplete at :the upper front contant and armature ot'relay 107 that relayy 192 is not operated.`` "While the receiverswitch 'is in position 2, the'high ref sistance winding of relay 166 is connected in .series with the low resistance winding of relay 169 atthe sender switch,causingithis.

last'mentioned relay to deenergifze `while the relay 1.66 at the recei-ver 'switch'.reinainsoperated.,y The sender switch is now advanced to position 3 in al circuit traceable-troni grounded battery, Windingv of its motor inag= net 126, armature and yibacln contact 4of thisY magnet conductor. 137, brush 186, conductor `170, hack contactand armature of relay 169 to ground. y Inv position of the sender switch i a circuit is elosedyfroxn ground through both windingsof relay 17,3, brush 168 of the sender switch, brush` 5910i. 'the' sender linderswitch, `middley contact and `armature ofy relay ,57, conductor 167,. trunkiinder brush; :51, inner `:Front `contact andarmature of relay over ring .Conductor i153 of the trunk, inner arma*- ture andfront Contact of relay 13d, receiverV switch brush 155 yin `its second position,

:r receiver switch enters `this position', acircnit 'uppermost armature.and front: contactinfis closed fork operating relay 193,2.extending from ground, winding ofl this relayycondiietor23f5, receiver switch brush 154, upper-V mostffront contact ,andA armature of relay 1,34, tip conductor 133 of the selected trunk,

k vrelay 116, trunk'finder 4brush 50, conductor 132,y lowerinost armature `and front` contact of relay 57, sender `finder brush `60,1eondu`ctor131sender switch'brnsh 130, kconductor `236, lowerinostgfront contact and/armature -of relay f165, resistance to groundedjbattery,

The relay 1,93, when.operated`closes a locking/circuit 'for itself fronijground,Y through its winding, front contactand.` armature over jconductorQ-B to lockingl battery.- rlfliefst'a-` i f the lowresstance winding* oirelay: 172,

' 173 is operated in this circuit and at ritsfifront f "thislast described circuit of relay 19.3..` 1 circuit isfalsoclosed -roin battery, throiigi tions vlamp c 16d is` lighted in inultinle :with fili; i

brush 155, over the circuit,previously de scribed toyb'rush y16,8 ofthe sender switchin position, through the-high anld; low resistancewindings of relay 173,L to ground. `'Relay contact vand armature closes an `operating cir .cuitv for-fthe, Inotorzymagnet '126 .which advannes the sender switch into )position L1. :,-n

- erate a relay at the Wanted office..l

y mese this position, the low resistancewinding Lof to energize relay 172, which closes an .operating clrcuit for magnet 1,46 of therrec-eiver switch for' advancing this `switch into position 4. j Thehigh resistance winding ,of relaV 172 `1s now included 1n the/circuit extending over trunk conductor 153 and through the,y low resistance winding; of relay 173 which causes :this lastnamed relay to `deenergize 172, to battery potential. This causes rel-ay 172vto` deenergize and advance the receiver switchI into position.y This alternate oper ,ation of the sender `and receiver switches con.- e

tinues, untilboth switches `are,advanced position 21. 1 e y It ywill seeny that thebrush 154 `of the receiver connects the twenty Lrelays,.A to l where battery potential is extended yrelay, 173 is connected to trunk conductor' 1:53

inclusive, of the indicator successively tothe f tip conductor 13S-.of the selected trunk as the .receiver switch advances its brushes through positions '1 to .20, inclusive. Thebrush I130 of the `sender switch Aconnects thefmentioned tip conductor 133`of the selected trunksuc- `cessiv'elyto corresponding relays of theregf isters and 'theregisterrelays which have been i r:

\ operatedin response toL the rdepression ofthe numerical keys willcloseqcircuits to operate and lock corresponding relays at:theindica-` e tor atthewanted oliice. lIt should be notedy thatthe relays of the registersender and of theindi'cating devicefare so connected to the various contacts ofthe sender switch and receiver switch,.fthat"as these switches are ad` vanced, current 1s reversed:y 1n` the signaling circuit, init eachsuc'ceeding position oifthese.

switches. Inthis waythe-overlap, when the sender switch In the case assumed, relaysA, B, E, :1,

locked foperatedin response tothe depress sion ofthe proper, keysr of the numerical key kset and, after theoperationof the. sender and receiver switches has taken place,corre spending relays will be `energized and locked operated in the receiver ofthe distant oice.

With these last mentioned relays operated,

vcircuits can readilybe ytraced for lighting n only the .statons lamp R, thousands `lamp No. 7, hundreds lamp No.7,tens1la1np No. Gand units lamp No. 4. 7 C 1 When the vsender switch. reachesposition ,f 21, a circuit is closed from grounded battery,

winding of magneti126,conductor 137, brush 13.6, conductor 180,? sender iinderbrnshfiS, i 5

moves, will not falsely ops.V

'tief `K, N andof/the. sender'registers were upper armature and front contact of relay 57, winding of relay 115, to ground. The Y magnet k126 remains inert, but the relay 115 is operated to open the operating circuit of the relay 116 of the trunk and the operating circuit of relay 37 of the trunk finder. Relay 37 in turn opens the holding circuit of relay 57 of the sender finder switch and the relay 65 of the sender which relay in turn causes relay to deenergizeA l/Vhen relay 25 retracts its armature, it closes a circuit from ground, through the sender switch brush 128, conductor 127, back contact, armature and winding of motor magnet 126 to grounded battery andthereby advances the sender switch into its normal position, while the relay 25 at its frontcontact opens the locking circuit which has been holding the actuated relays of the registers-in operated position. The trunk finder and the sender finder remain in the position last used.

After the' lighting of the indicator lamps rat the distant office, the B operator notes the designation of the wanted line and tests the multiple of the wanted line in the well known manner and, if this line is idle, inserts the plug 126v intogthe multiple jack 127 of this line. This last operation actuatesthe sleeve relay' 151 which thereupon opens lthe conductor 150 by which the relay 134 and relay V148 have been held operated. Relay 134 deenergizes and extends the conductors 133 and 153 of the selectedtrunk through the windings of the repeating coil ofthe B operators cord circ-uit'. The relay 148 upon. deenergizing closes a` circuit *from ground, through its armature and back contact,

L brush 145 of the receiver switch, armature,

back contact and winding of the motor magnet 146 to grounded battery which circuit is effective to advance the receiver switch to its relay 141, uppermost front contact and armature of relay 138.,to ground. Relay 242 is actuated in this circuit andlocks itself operated from a circuit rclosed 'from` grounded battery, its lower winding, front contact and armature, to ground at the uppermost front contactand armature of relay 138. The relay 141 is operated in multiple with the last described circuit through its continuity spring Aand Contact and, when operated, closes a locking circuit for itself through its continuity spring and armature. As soon as the relay 242,. is operated, tCIQSESaIIIgng circuit-from the source of current through the depressed partyke-y 190 and in ser-ies through the back contacts ofkeys 189 and 188, conduct-or 243, lower front' contact andarmature of relay '138,-winding of tripv relay 244, upper front contact and armature of ringing relay 242.tl1rough the lower side of the opera-tors cord circuit and called line in series, through the tuned ringer at the B subscribers station over the upper side. of this line and the operatcrs cord circuit in series to ground at the uppermost armature and Ifront contacts of ringing relay 242. When the called party responds, the trip relay 244 attracts its armature to shortcircu it the ringing lrelay 242 which thereupon opens its locking circuit and remainsv inert to prevent inadvertent reapplication of signalling'current on this connection. Also, .when the ringing relay 242 retracts its armatures, fit completes a circuit for the.`

circuits by which supervision is obtained since these operations take place in the same manner asv in multi-oflice telephone systems now in use. It will be sufficient to understand that atthe termination of the conversation, proper signals will be displayed to the A and B operators who thereupon manually restore the cord circuits which have been in use.

It shouldbe pointed out that the B operatorcan increase the speed of completing connections at her position by operating the com-Ay mon release key 125, as soon as she has noted thedesignation of the wanted line instead of Waiting for the release operation of the receiver relay registers to be effectedby inserting the plug 126 into the multiplejack 127.

By arranging the incoming trunk circuit with a so-called automatic busy test arrangement, that is, an arrangement wherein the operator does not-,have to test the multiple of a wanted line but simply inserts the` plug of 'her cord circuit into a multiple jack of this line whereupon automatic means completes the connection, if the wanted line is idle, and prevents the completion of this connection, if the wanted liuc is engaged, the B operator need not be pro-vided with a telephone set. lVliile vin this disclosure .manual party keys have been disclosed for selecting the current of proper frequency for selecting wanted stations on a partyjline, it will be understood that the system herein disclosed will be equally effective, if the signalling current is selected automatically.

What-fis claimed is: c i111 a :telephone system, an operators t "position, telephone lines terminating iii-'said position,l a second operatorsfposition, other vnect'ing'said positions, a trunk indicating de- 5 vice atsaid iii'st position, a line indicating device at said second position, means at said yiii-st *position whereby an operator receives 2:10' liiection to awant'ed telephone line, means f: `im Yen-aia `responsive thereto for selecting an idle trunk to said second `operators position and for causing saidtrunk indicating device to give ltlietrunk indication of the selected trunk line 5f at said iirst` operators position, a-'circuit for connectingv the calling'line and the'selected trunk, means contr0lled7at1said` first position for*causingsaid*line indicating device to givethe designation YoftheI wanted line, and 25""a1manual switch fbyf'nieans of which an oper Fatorat 'said second positionl connects the *selectedtrunk `tothe Wantedtelephone line.

` v2. In a] telephone system',vv plurality of operators positions?,- each provided with -a 25numericaly key set,`a plurality of* senders comnionvto 'said' positions, ineansfor alloty'ting senders or'use', means controlled atan op'erators position for as'so'ciatingits nujmeiicalkey setwith an allotted sender'wliererolbyVsaid sender is'variably adjusted-in accordaiicewith apredetermined code, lother opeiatoi"s'`po'sitions' veachr E'provided ywith an "indicating device, an'dmeans underthe con# trolof'asender yfor operatin lin indicating i ,"35 devicein accordance-withtlie'adjustinent lof 3. lnatelephone system, apluralityot ofices, a plurality oftrunkcircuits connecting one olice with ai second oice, a'plurality of selecting a'fsender fory use ahead ofthe call, a plurality `i'"s'witclies, a'lin'k"circuit'termi -n'ating 'at oneI endl 'inaswitclii'o'r selecting a ti` `kf'circ'uitfvv and terminating at its "other v4;; en in a switch for seizing a pieslected sender,

celvlwitlif" a predetermined code,

"forisei ing' a preselected sender,

forfseiziiigaii idle link circuit yind' tl'ier'eb'y efect the operation ofH sai' yst y"i1-iid second switches,r an indicatiii'gldv" 'e it ythe'ksecond 6.5 coince;`

v i ut terminating atl one endl intafswitcl" fpeiatin'gfto lseize ifal trunk circuit, said ylink 'rininating 'at itsother end'in' a switch aftliii'd switch nd ineaii'sf cotrolldlby said adj usted "sendei andconti'olled through said first and A n second switches over a selectedtrunkfor se-v `lines terminating'tli'ereat, trunkcircuits coiilectively operating said indicating device.

5; The method of completing a. telephone connection which consists in the subscribei` repeating the number of the wanted line to an operator, aid operator tliereuponmaniially the designation ofwanted lines, means conftrolled at said position for' initiating a con-A selectingtlie` oiice'through` which a wanted subscribercan be reached, selecting a trunk to ysaid office, visually signalling the desig- '--nation of tlieselected trunk to said operator,

'said operator then connecting the callings'ubsciiber i andthe selected trunk, :visually signallingtlie number of the Wanted subscriber r'to a secondv operator, "and connecting the wanted-lineto the designated trunk. y

1 6. Ina teleplionesysteni, pluralityof offices, an A operators position-y at onev of said oificesgB Aoperators positions at the other offices,ntrunks for `connectingsaidv A operators.

position `to each of 'said' other oiiices,`oiiice keys one foreach oiiice accessible to said A `operators` posit-ion, and means responsive to the operationof an oiiice key for automatically selecting al'trunk to awaiited oiiice and for automatically `indicating the designation oi said'trunk to saidA operatorsposition.

7 Ingatelephone system-L a plurality of teleplioiieotlices, an Aoperators position at i one of said oiiices, B operators positions at' W the other offices, trunks for connecting said rof one ofsaid keys for automatically fselectingtrunks toa wanted" office, and automatic indicating means forgiving the designation v' of selected trunks. i i

l8. yIn a telephone system, ja# plurality'` v:telephone oilices",r plura'lityoit A operators positions `at one ofsaid oiii'ces, 'B operators positions ateachfof saidy other oiiices, trunks leading-from said A operators positions kto eacliiof said'other ft'lces',` an oiiice keyat each Avoperatons position foreach office reached from-saidfAfo craters ositions a trunk 'indicator at said A;operatorspositions, a -nuinber indicator at each of said distant off "li'ces,` a'plurality ofsender's common to said -opeiiators r`positions" and var-iably`- adjusted therefrom, and `means iesponsiveto the adjustment otsaid senders for selectivelj operating said number indicators. A i In a telephone j syste- ,fo'iiice's, 'an A'operatorspositioii at `one of said offices, a `B `otiticetaKfretgisterseiider at the A oaeratorls "operators position the other` posi o comprising a, group of registers ai-y "iran'ged tobeselectively operate'dgunder the fcntrol'ottliecid op y y'movable switch associatedwith l"said register sender, an" indi'eatingl device -at the B operaeifttor, a progressively w 'tors'positioma progressively movablesvvitch associated" therewith, and means'ior'operatwo telephone ing said switches alternately whereby the registration on said register' sender is transferred to the indicating device at the B operators position.

10. In a telephone system, an A operators position, register sender including a progressively movable switch located at said position, means at said position for vvariably adjusting said register sender in accordance with a predetermined code, a B operators position, a trunk circuit connecting said oper- -ators positions, an indicator at said B operators position arranged to be variably operated in accordance with the setting ot said register sender, a. progressively movable switch associated with said indicator, means for setting said switches in operation, means effective thereafter whereby the switch associated with said indicator completes operating circuits for the switch asociated with said register sender and means whereby the switch associated with the register sender closes operating circuits for the switch associated with said indicator, and means functioning during the advance of said switches for effecting the operation ot the indicator in accordance with the adjustment of said register sender. l

l1. In a telephone system, a plurality of othces, a plurality ot A operators positions at v one of said offices, a B operators position at the other oliice, a plurality of register senders for the use said A operators `positions arranged to be variably adjusted therefrom, means tor associating an idle register sender `with an A operators position, each of said register senders being provided. with a progressively movable sender switch, a trunk circuit connecting said A operators positions and said B operators position, an indicating device located at said B operators position and a progressively movable receiver switch yassociated therewith, means for initiating the operation ot` said switches, other means eiective thereafter whereby the receiver switchv effects the advance ot the sender switch, additional means whereby the sender switch effects the advancel et said receiverswitch, and means operating ander the control et' said switches whereby the register sender eitiects the operation 01"' said 'adicator over said tri'ini: circuit. Y A

1Q. In a telephone system, a plurality ot oiices, plurality ot A operatorspositions at one ot said oiiices, a B operators position at the other office, a single strip of keys at cach A operators position, a plurality of register senders for the use oi said A operators positions and arranged to be variably adjusted by said keys, means for associating an idle register sender with an A operators position, each of said register senders being lprovided with a progressively movable switch, a trunk circuit connecting said A .operatorsfpositionsand said B "operators position, an indicating device located at said B operator-s position, 'a progressively movable receiver switch associated therewith, means for initiating the operation of said switches, other means effective thereafter whereby the receiver switch effects the acvancc of thc sender switch, additional mea-ns whereby the sender switch etfe'cts the advance ot said receiver switch, and means operating under the control of said switcics whereby Y the register' sender eiiects the operation of said indicator over said trunk circuit.

i3, In a telephone system, a plurality of offices, a plurality ot A operators positions at one of said oiiices, a B operators positionk ceiver switch effects the advance of the sender switch, additional means whereby'the sender switch eiiects the advance oi said receiver switch, and means operating ander the control of said switches whereby the register sender etieets the operation or" said indicator over said trunlr circuit. 1 l

v 14. In a telephone system, a plurality ot offices, a pluralit i of A operators positions at one of said o ces, a B operators position at the other oliice, a plurality of register senders for the use of said A operators positions, each of said register senders including a plurality of relays arranged to -be variably adjusted from said operators positions, means for associating an idle register sender with an i' A operators position, each of said register senders being provided with a progressively movable sender switch, a `trunlr circuit connecting said A operators positions and said B operators position, an indicatingdevice located at said B operators position and a progressively movable receiver switch, yassociated therewith, means for initiating the operation of said switches,

other means effective Vthereafter whereby the receivery switch effects the advance of the sender switch, vadditional means whereby the sender switch effects the advance of said receiver switchfand means operating under thecontrolA of. said switches whereby the register sender effects the'oper- Alation of said indicator over said trunk circuit.

15. In a telephone system, a plurality of operators positions,{ each of said positions beingprovided with singleset of keys, a f

16. In a telephone system, an A operators,

position, a B operator-s position, telephone lines terminating at each of said positions, a trunk circuit extending between said positions, a register sender in said A operators position arranged to be variably actuated in accordance With the designa-tionjof a Wanted telephone line, anr indicating device at Vsaid B operators position, and means having a signaling circuit including at least one ot the conductors of said trunkcirciiit for transferringthe designationvrecorded on saidregister senderto said indicating device, said means "including mechanism ltor reversing thev direction of current flow in said signaling circuit a plurality of times `during the trans- ;fer ofthe designation :from said register lsender to said indicating device.` f

k17 yIn a teleplionesystem, an A operators position. a B operators position, telephone i lines terminatingv ink said positions, a trunk register sender at said A operators position arranged to be actuated in accordance With circuitextending between said positions, a

tliedesignation of a Wanted telephone line, an indicating device atsaid B operators position,a signaling circuit including at least one conductor of said trunk circuit for trans-` ferring the designation of said register'seiidf er'to. said indicating device, jiiieans at' saidy operat'ors position for connecting said trunk circuit tothe indicated line, andtwomeaiis for'releasingsaid registersender andA said receiving device prior to theuterminatieii of `the connection. f f

n .18. In a telephone system, ann operators position, a-B operators position, telephone lines terminating at each ofsaid positions, a registering device located at saidgjin` operators position and arranged to be actuated in. accordance with the designation ofV a.

Wanted telephone.` line, an, indicating device located at said B operators p position, asignaling circuit including i at least'.one conductor 'of said trunk circuit for, transferring 4the designationl ofisaidxwanted `telephonev line kvfrom-"said" registering device tosaidl indicat-` ing device, a'release key, andswitching means A'for connectingv sai-dv trunk :circuit to said Wanted telephone line,` said, release fkey -and eating devices.4 ,n

said switching means beingindividiially effective to release said registering yandj indiv19,. Inia't'eleplioiie exchange systeiinaplurality of operators positions, apluralityct l outgofiiid f'triiiiks, each;A trunk fterinin ating at its. 'distant end mi a `manual :connection-terroperation of said sender controlling ment. i

20'. yIn a telephone exchange system, a plurality ot operators positions, a plurality of outgoing trunks, each trunk terminating at its distant end in a manual connection terminal, mechanism associable with the distant ends of said trunks for indicating the numbers of Wanted lines, a plurality of senders, a plurality of sender controlling equipments, a plurality of switching units common to said operators"positions, meanss'to operate f a switching unit to establish an interconnection between a sender controlling equipment, a sender and an idle trunk, means to indicate toan opera-tor the number of the idle trunk selected, and means to operate said mechanism over said trunk under the control of a sender in accordance with the operation o said sender controlling equipment. f

21. In a telephone exchange system,` in combination, incoming lines, outgoing trunks, each.y trunk terminating at its distant end in a manually-'operable connection terminal, an operators position, a cord circuit terminating at each enclin amanually operable device for interconnecting an incoifningv line and an outgoing trunk, mechanism associable `with the distant ends of said .trunks for indicating the numbers of Wanted lines, a plurality of vari- `ably r.operable senders for controlling said mechanism over said trunks independent of i said cord circuit, and means at said operator-s `position to control the automatic selectionot a trunk and tovariably control the settin of said senders for controlling said mechanism.

at each end in a manuallyv operable device tor intelfCIlIiecting'anincominglline and an outgoingrtiuiik under the control of said'operators position, mechanism associable Witli'the distantends ofsaidtrunks for indicating the `numbers, of Wanted lines, a yplurality of Vaiiy ably operable senders for transmittingseries ofvimpulses of varying characteristics'overl said' trunks for controlling said mechanism, i and" mean-s at said operators position vto control the automatic selectionv of a trunkand ,of a sender and to variably control thesettiiig y, 22. In a telephone exchange system, in coniy equipment, a sender of said senders for controlling said mechaw nism.

23. In a telephone exchange system, in combination, incoming lines, outgoing trunks, each trunk terminating at its distant end in a manually operable connection terminal, an operators position, a cord circuit terminading at each end in a manually operable device for interconnecting an incoming line and an outgoing trunk under the control of said operators position, means associable with the distant ends of said trunks for indicating the numbers of wanted lines, a plurality of senders for transmitting series of im aulses oi Varying characteristics over said trunks for controlling said mechanism, registers in said senders for recording the digits of wanted line numbers, and means at said operators position to control the automatic selection ot a A trunk and of a sender and for Variably controlling the setting of said registers for controlling said mechanism.

24. ln a telephone exchange system, a plurality of operators positions, a plurality ont outgoing trunks, each trunk terminating at its distant end in a manually operable connection terminal, mechanism associable with the distant ends of said trunks tor indicating the numbers of wanted lines, a plurality of senders, a plurality of sender controlling equipments, a plurality or switching units common to said operators positions, means to operate a switching unit to establish an interconnection between a sender controlling and an idle trunk, means to operate said mechanism over said trunk under the control of a sender in accordance with the operation o't said sender controlling mechanism, and means operative following the completion of the operation of said sender to release said switching unit.

25. In a telephone exchange system, a plurality of operators positions, other operators positions, a plurality of outgoing trunks, said trunks terminating at said latter positions in manually operable connection terminals, mechanism associable with the distant ends of said trunks for indicating the numbers o wanted lines, a plurality of senders, a plurality of sender controlling equipments, a plurality of switching units common to said lirst operators positions, means to operate a switching unit to establish an interconnection between a sender controlling equipment, a sender and an idle trunk, means to operate said mechanism over said trunk under the control of a sender in accordance with the operation of said sender, controlling mechanism and means operative upon the response of a second mentioned operator to start said sender into operation.

26. Ina telephone exchange system, a plurality of incoming lines, a plurality of outgoing trunks, each trunk terminating at its distant end in a manually operable connection terminal, means for interconnecting said lines and trunks, mechanism associable with the distant ends of said trunks for indicating the numerical designation of a desired line, a register sender, groups of relay registers for said sender, means for registering the numerical designation of a desired line on said registers, means associated with said sender for transmitting over said trunks a plurality ot series of impulses ot varying characteristics corresponding to the numerical designations registered upon said registers tor controlling said mechanism, and means for changing the order oi transmission of said series o'li impulses.

27. In a telephone exchange system, a plurality of incoming lines, a plurality of outgoing trunks, each trunk terminating at its distant end in a manually operable connection terminal, means. for interconnecting said lines and trunks, mechanism associable with the distant ends of said trunks for indicating the numerical designation of a desired line, a register sender, groups of relay registers for said sender, means for registering the numerical anc stations designations of a desired line on said registers, means associated with said sender for transmitting over said trunks, a plurality of series of impulses of -varying characteristics corresponding to the designations registered on said registers for controlling said mechanism, and means for changing the order oi transmission of said series oi impulses in accordance with the operated condition of the relays of certain of said registers.

In witness whereof, I hereunto subscribe my name this 9th day of April, A. D. 1926.

VVINFREI) T. POELL.v

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