US1175896A - Telephone apparatus. - Google Patents

Description

7 B. D.; WILLIS. 'TELEPHONE APPARATUS.

' APPLICATION FILED OCT. 5,1906- Patented Mar, 14, 1916.

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illmhlllllr wmv @my HUA@ mvo @Q TELEPHONE APPARATUS. APPLICATION FILED ocT. 5, 1996.

1,175,896. Patented Mar.14,1916.

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Q llllllllllllHhIA UNITED sTATEs PATENT CEEICE.

BERNARD D. WILLIS, or' CHICAGO, ILLINOIS, AsSIGNoR, BY MESNE ASSIGNMENTS, To

FIRST TRUST AND SAVINGS BANK, TRUSTEE, or CHICAGO, ILLINOIS.

TELEPHONE APARATUS.

Specification of Letters Yatent.

` A.Application pled October 5, 1906. 'i Serial No. 337,593.

l'o all tv/wm it may concern Be it known that I, BERNARD D. WILLIS, a citizen of the-United States of America, and resident of Chicago, Cook county,Illinois,

- .5 have invented a certain new and useful Im- A Special objects ofmy invention are the provisionof improved means for enabling' j a calling subscriber of an automatic ory semiautomatictelephone exchange to att act the attention of and secure telephonie communication with a central station operator or attendant; the provision of means whereby, out o f a plurality of lines each provided with oneor more telelhones, line may be automatica y selected by a Call ing subscriber whose telephone receives talkf ing current from a common battery at lthe exchange or central station; and the provi sion of certain details and features-of improvement. and' co-mblnations tending to increase the general eliiciency and improve the service ot' a telephone exchange system.

'lo the foregoing and `other useful ends,

my invention consists in matters hereinafter set forth andclaimed.

A40 In the accompanying drawings, Figure 1 is a ydiagram showing asubscribers automaticsubstation at A, a central battery at B having its positive terminal preferably `grounded pat G. C indicates the well-known change. At Dis shown the relay and circuit connections ot'my improved signal-re#- eeiving apparatus. The substation A has operated the first-selector C, which latter in ,50 turn has selected a line of whichD is a the first idle` line extended 'from the first operators posi .tion to the second, ope 'ators Vposition by throwing the key F. The attendant at the second position, in like manner, and by throwing the key H, may in turn extend the trunkline to the thirdv position; thus when the trunk line-is seized the signal will be transterred to position #3 without signaling posi-tions #l and #2.

For convenience ot' explanation, assume that in an automatic exchange the naughtlevel of ten contacts is connected withtrunk lines leading to a tollboard, and that the tollboard terminal of each of said trunk lines is provided with one of my improved signaling arrangements. The operation of the signaling equipment, as used in this connecvPatented Mar. 14,1916.4

tion, is illustrative of its action in any connection in which it may be used.

The substation A maybe of any suitable or approved type. The substation A comprises a receiver 2, switch-hook 3, inductioncoil 4 which consists of the primary winding and secondary winding 6, transmitter 7, condenser 8, ringer 9, impulse wheel 10 which has the usual vertical impulse teeth l1 rthat-are adapted lto operate the vertical impulse spring 12. The impulse wheel carries the rotary ilnpulse tooth 13, which latter operates the rotary impulse spring 14. The

'switch-hook has radiating trom its body a 'number ot cam-arms 15, 16 and 17, and is sov y pivotally secured to the key board (not M shown) by the screw' 18 about lwhich it moves.

when the receiver is removed. The movement is produced by a spring and V,the switch-.hook is pushed -up for the purpose ot' changing certaincircuit connections to ,be disclosed. The cam-arm 15 controls the so-called locking arml9. After the dial is rotated the locking arm.19 occu pies the position shown at substation A. The mechanical operations by which thisis brought about are well known. The coperating ground springs 20 and 21 engage, thus placing the ground post 22 in Contact with the substatlon Iground G1, whereby when the subscriber releases the dialy for ro,- tating it, as described, the vertical impulse teeth y11A will Cause the Y' vertical impulse spring 12 to come in Contact with the ground post 22, and immediately following the rotary `impulse tooth 13 causes the'rotary impulse spring 14 to come in Contact witlrthe same ground post 22. .When the switch-hook (not shown) vbridging Athe g separation ofthe springsand Y 10- `may signal another subscriber Ln ection ,has been established comprises a anda spring 29, which lat` Vthe "switclrho t, ductors simultaneously.

beofany suitable stance ofthe generalv type described in'Patl issued Mai-'ch 131'906toy,r and" Erickson.l .It eiiibod f details the following 'ivell- .l i knowndevices and circuits: A-switch-shaft- ,g-'(no'tshown)-V carriesthevertical and rotaryf" Keith,v Erickson i 'l laye@ and i vhile the Vsideswitych is infir'st magnet 48, which f cally. I Bv moans of the l 'shaftaiid.shaft wipers ciilaiidircction "scriher.controls the i'clea y' V the side "sw positioin then, since controlled through the "which ,la connection has y j"'"isdown the. cam-arin 17 maintains a' con--v :tactibetween the springs 23 and -24,.ther eby denser 8 in .series with' the' u ringer acrossthe line. The springs .-2 5y and .26` are then disengaged, and the 'primary circuit including the windinginl lseries with; the transmitter 7 is interruptedl 26;y y a subscriber 1 yThe signalingdevice whereby [Push vbutton ter@ normally engages the con-tach-point :3.0; fbutv when the push button 2 @pressed the d spring 29 leaves the 'Contact pint 30am] whichlatter engages the, contact point 31, I gis :onnectedlvii-*ith the substation ground G1, Theinveaiis whereby *the subscriber may re.-`

lease;- theentral station apparatus lbrought, '245` -intofgservice,comprises three springs 32, 33

.` asdfl known .as the release-springs aiidso` controlled-hv thejcani-arin 1G rthat when;l

ok descendsthe' three release#y springs are brought intol contact, thereby. goui'idin both the subscriberslinecon;l `Thefirst-selector switchshown at O may.4

`or approved type, for'in `eagle@v 815,321,

wiesglamong other D wipers m89 -and 40,`

respectively,4 and the private iviperzll.`

wiper, respectively. c The side switch isunlil 'dergthe control 'ofthe private magnete@ Through tht-ii'i'ed'iuin Aof' the vertical line reposition;Y the shaft and shaft wipers 395 40 and 41 verti-L` position,1thc .subscriber `controls thepi'ivate itch., is' in secondv position `the rotary magnet 50, which fcarriesr the in' a rota-ry 'oi' cirf:

l ino relays .V47 and Jgf'actinglconitch is -iii` first sible.

'throughfthe windin f The side switch is well f' line receiveswcurrent roinfthe grounded f known and comprises' the side sv\ 'itch`wipei's'l -which inaybe designatedv`l` as verticahlrotary: and' private side switch `Wipersi'andf'therotary.magnet side 'switch-A IOtll'y line relay 4993iA is ciiergized. Thevertical relays arid battery B. This is desirable,

because if the relays are the battery, ing the subsc'rilier'm selector Aswitch. C ott" fn0r1n'al.` I

j siralfile to remove thelbridg'e'forined through It is'-also de-A Thde bridge# not disconnected i'roin each other, and troni the ringing current for signalay operate veither or f y, both yof theipifelays' -li'V and 49; iiiovingthe after a; con-i f the voice-curne s as `clearl--a path as poshe/ first-selector switch-shaft is also with a normal post arm which,

"provide V whenthe shaft is in nornialaposition,'closes rso the spring in Contact withV thed contara?- yIpoint` 56; but ywhen the shatt is raised one vorniore Stepsthespring 55 closesincontact f with the c'ont'actpoiiity 575 'by which switching 'means' the switch' is Blade ybusy-while ,off normal, and ther eiiergiz ferential relay ($3 the calling substationv lis' ing" circuitiffor' the relay 53 iscontrolled.

My improved apparatus:comprises averf* tical relay r58,r a rotaryi` vrelay 59 havingtwo- ,-"windi-ngs 60` and Giri-eleasiii'g relay@ which, releases the rotaryielay') whentlie latter ,'pi-'oifided'with` talking battery current when the operatos -keyl E 1s throwntoilistening position.' The rotaryrl'lin'e receivescuri-entf* froinjthe non-grounded' pole of the batteryg 64, and the.'` vertical through the. winding G5 relay 68; The lamp reif *iny Fig. lthe springs'68`and69, and 'Wand 'i 7l are pressed rinto Contact, "thus bridging j the operators receiver seh-across the trunk subscriber controlshthe vertical-v` latter operates .to raise the line' by way of the condensers? and 73.1 The operation o .thewspring 'V75A i spring 76, andthe lspringsv 77qand. 78 to dis` enriage'."-y

ier

terseparates the springs 23 an i-eii'ioviiig the ringerfroin'across the line and. `substituting thereforuthe primary' circuit vby perii'iitti'iigfthe sprii-ifgs 25 and ftofclose. Sinoethe trunk lines lead off from the @naught-level of the `frs't-sehectOrS, the sub- .scriber" suitably` operates "his dial' for the l digit O, thereby grounding c'indu'ctor 79 -ten timesgf-aiid vthe rotary linev conductor 80 `once upon the return motion of the dial. ;The, ground l 0st 22 is' placed iny connection with the s station ground G1' 1'10 fthe key 'falso ,causes the Aspring-17l to' pass v'fronti engagement `with ntoengagement with the" A removes the lrethe vertical line relay eXtends from `the private magnet 46 times energizes the vertical line relay 47 of the firstselector. The circuit through said ground G1 through the springs 20 and 21, vertical impulse spring 12., vertical line conductor 79, sideswitch wiper 42, Contact point 81, through the winding of the vertical line relay 47 bridge-cutoff springs 82 and 83 to the battery lead 84, thence thro-ugh battery B to ground G.. Each time the vertical line relay 47 is energized the springs 85 and 86 are pressed into engagement an an energizing circuit is established each time through the vertical magnet l48. The circuit through the said magnet extends., from: ground IIGL to the springs 85 and 86, to the private magnet springs 87 and 88, yertical magnet 48 to the battery lead 84, thence through battery B to ground G. The vertical magnet being operated ten times the first-selector switchshaft and wipers 39, 40 and 41 are carried to a level with thecontact points that constitute the terminals of the trunk line leading to thecircuit D. Following the vertical impulses the rotary impulse spring comes incontact with the ground post 22, thereby grounding the rotary line conductor 80 once and energiz'ing'the rotary line relay 49 of the first-selector once. The path of the energizing current may be traced as follows: from `the substation ground Gr1 to the rotary line conductor 80, side ,switch wiper 43, contact point 89 to the rotary line relay 49, bridgecut-oi` springs 90, 82 and 83 to the battery lead 84, thence through battery B to ground G. Therotary line relay 49upon energizing closes in contact the springs 91 and 85, thereby closing an energizing circuit through which extends from ground G2 to the springs 85 and 91, private magnet 46 to the battery-'lead 84, thence lished throu through battery B to ground G. The private magnet 46being energized for a` moment the side switch of the. first-selector C passes from irst'to second-position, thereby permittingthe side switch wiper 45 to engage the contact point 92, thus closing a circuit! through the rotary magnet 50. The current flow is from the groundG3 to the contact point 92, side switch wiper 45, interrupter springs 93 and 94, through the winding of the coil of the rotary magnet 50, thence to the battery lead 84, and through battery B to ground G. The rotary magnet is energized one step `and the shaft wipers 39, .40 and'41 are carried into engagement with the bank contacts'that constitute the terminals 4of a trunk line leading to the circuit D.

Assume that the trunk leading to the said `circuit/leads oi' from the rst set of con- J`tacts of the` naughtdevel.

l If the first trunk an energizing circuit is estab'- Ah theprivate magnet 46 when line is busy the private wiper 4-1 strikes the busy private bank contact, which is, of course, grounded,

thereby retaining the side switch in second position and maintaining the energizing ciri cuit through the rotary magnet 50. The rotary magnet by intermittent magnetization thus causes the-shaft to rotate step-by-step and carry the wipers past the last busy trunk line. vHowever, as soon as the rivate magnet is denergized the side switch is tripped into third position; but if there are no busy contacts to be passed over, as assumed in the first instance, `net 50, as is well known, trips the side switch to third position, with the result that the side switch wipers 42, 43, 44 and 45 en-` gage their respective contact points 95, 96, 97 and 98, thus extending the subscribers line conductors l7 9 andcircuit D. Also, since the side switch wiper 44 engages the ground contact point 97, a guarding potential is established at the private wiper 41 for protecting the seized line from being molested by any other switch.

`When the side switch wiper 44 passes to the ground contact point 97 an energizing circuit is established through the lamp relay 66. VSaid circuit extends from ground G4 to contact point 97, side' switch wiper 44, release relay 52, switch-shaft private wiper' 41, contact point 99, relay armature'lOO, through the winding of the lamp relay 66, contact point 101, relay armature' 102, battery lead 84, thence .through battery B to ground G. The lamp relay 66 upon energization closes a circuit through the signal lamp 67. This cir cuit extends from ground G5 to the springs 78 and 77, rel-ay armature 103, contact point 104, signal lamp 67 to the battery lead 84, thence through battery B to ground G.

he operator in response to the signal throws the key E to the position shown in Fig. L This results in breaking, at the springs 77 and 78, the circuit through the signal lamp, and placing in contact the springs 68 and 69 and 70 and 71, which bridges the operators set across the said line, and furthermore the spring 74 disengages from the spring 75 and comesin con tact with the spring 7 6.i This latter contact closes a circuit which supplies the calling 'substation with current for talking purposes. The circuit extends lfrom ground GG the rotary magthrough the winding 65 of the differential V relay 63, contact point 105, relay 'armature 106,'springs 76 and 74, through the winding of the Vertical line relay 58, conductor 115, wiper 39, side switchwiper 42, vertical line conductor 79, springs 25 and, 26,-push button spring 29, contact point 30, transmitter 7, primary winding-5, rotary line conductor 80, side switch wiper 43, contact point 96, shaft wiper 40, conductor 116, through the winding 61 of the rotary relay 59, winding 64 of the di'erential relay 63 to the battery` tica The talking current energizes the' ver-v relay` 58', wlnch'latter attracts its, ar-

matures T and vr108. The fornlerclosegv in contact with the point 10S),-` and the latter (108),' closes in contact with "the `contact point 11 0. The talking current vin passing throiigh the windingv ($1 of the r tary relay in!) cncrgifzcs vsaid rclay, and tb" armature l lsldrawn from -invcontactwith the -point .j M ...tlici'eby breaking the energizing circuit extending from ground G* 'through the lamp @through both windings.y Suppose the subscriberfA.hasdehvered the niessageto the operator-.and the operator has restored the substation-A and restorin AcerptfWt-iedoublenvound re ay 59.*wliich is maintained energized by rthe locking circuit l previously tra cedl-l In the meantime the sub-` f scriberfat 'A has not replaced the receiver n f on thesujitchhook, but desires to add tothe vj in essagelD Accordingly the signalinglbutton A 28 is; pressed,` grounding the vertical-'line conductor 79, which causes the signal lainp f 'relayy (1G andto battirryjl.'l The armature .1 1,1.ei1ga'gi'es the pointv 112; which establishes f an energizing -circuit thro-ugh the winding "360; 'aid .cii'zcuit'locks the' relay 59 in an op- "'eratcd position. until the said circuit is .Wbroknattheccijitact'point 113 and armature 1114.. Thislocking circuit extends from through battery B to ground G.. Since'both lings-. (l and 05 of the relay G3 are difially, arranged,l the relayl armatures and-'100 remain 4in vvtheir normal posi; lieven .though current isp-flowing keyQEf-to norinalr position, as shown at E in Fig 2, thus removing the talking circuit to D to laslry The circuits established in: bringing this about are as follows: from sub- '."stati'on, ground Gl, contact point'l, spring 28 s1`irings26 and 25, vertical line condu'c-- toi-79, side-switch Wiper 42contact point 95,-sli`aftwiper 39, conductor 115, through.- 1 the-Winding of relay 58, springs 7.4 and 751 totheYbattery`lead84, thence through bat'- tery' B to rground G. The vertical relay f '58' upon lenel'gizing ',attracts'the armatures y107 a`nd108Which latter closes angl'energiz.- "ing,ci'icuitlthrough the lamp relay'havhich iiit'urn attracts its armature/ 103 andestabj lishesacircuit through the signal lamp 67, '-7.'asfpreviously traced. Theoperator iure- :spouse again" vthrowsvthe key E,`s\vitching ythesp1-1fngsYallotted'thereto as explained. he release of the signaling 'apparatus- .1f when@the'keyv E is in normal positionis brought" about when'the subscriber A ressto'resjthe receiver 2 to thevswitch-hook 3 andf` '1. simultaneiously` grounds both the vertical @an rotaryline conductors 79 and 80, re- ,spr-letively- `This 'results in a flow of current lays. This circuit Ve2; contact point 97, r through the windingof the release relay 52.

the relays, eX-

.f `frein `substation ground G1 to the release-springs 32, 38 and 84, thenceover the conductor 79, through` the line relay 58,

springs y74 and 75 to battery? l5` and to ground G, as previously traced. The current flow over the rotary line extends from ksubstation ground G? tothe release-springs 1 82 and'BB, rotary line conductor 80, thence through the relays 59 and 63, as previously followed, to'hatteryV B andto ground G, energizing the differential relay 88. energization or'v the vertical relay 58 closes The in Contact .the armature 107 and the contact pointr109, which places therelease relay' 52 "of the rst-selector'in series' with the. re-

lease-ielay 62 of the signaling apparatus= `The current that passes through the 'Winding (il-of the' differential relay 63 magnetizes the core, which' attracts thcarmature 102 and placesfincoutact the'saidarmature and contact point 117,thereby establishing an energizing circuit through the said release retends from ground Gt, switch Wiper 44,

switch-shaft Wiper 41 to the armature 107,

armature 114 to disengage froxnthe contact` r"point 113, thereby opening 4the locking cir cuit through-the Winding @Cof .the rotary Irelay 5,9. The release relay 52 of the firstselector upon energization places in `contact "the springs 118 and 1.19,- which in turn comy lease magnet 51 extending from ground G to the springs 118 and 119, release magnet 51 to the battery lead 84C, thence through l11,1 y

itery B to ground G., f The release relaysan 'magnet 'thusl energized -f attract their respective armatures, and as soonfa's the su station release springs 82,83 and ffsepaluf rate and break the. ground connection With the line conductors 7 9 and 80thcy again deductor 79, release-springs 34, 33 and` 32 to fthe substation ground G1. ,SinceA thewinding "64 alone carries current the' .relay 63 be' comes active a d'clpses in'contact the armature -102 and Contactl point 117 andthe vrenergize, releasing all apparatus brought [into service by the c allingsubscriber. As- Ty sume that the calling subscriber A. replaces the receiver before `the key'E is restored. Y "The release is then brought aboutl over slightly "different circuits. The differential ously described, the selector `-.atlalsecond attendants 551lieve the first operator;A likewise the .second iatte'fldant i may 4 transfer geo,

l #and contact p armature 106 and vertical relay 58 now becomes energized by a. current flowing from the substation ground G1,'vertical line conductor 7 9 to the relay 58, springs 74 and 76, armature 106, contact point 120 to the battery lead 84, thence through battery B to ground G. Thev armature 102 upon engaging the contact point '117 completes the energizing circuit through the release. relays 52 and 62, and, as previ- C is released after the release-springs 32, 33 and 34 Sepa- 1 rate;` the -connection to the circuit `D is y broken; the relay 59 is denergized, and all energized parts are fully restored. `In a system of great size Where the switches are divided into groups, from every ygroup there will lead off, of course, ten trunk lines to the board in which all switch? ing circuits are located. The arrangement omaybe such that all the trunk lines termnate vat one operators position, or if the traffic becomes heavy, additional operators l positions may be provided, as shown in Fig. Y2.' `lVhen this arrangement is followed out it is sometimes desirable to transfer all the u calls to one operators position, for instance at night time. The work being slack 'at night one operator may be able to take care of all the work, or two operators, etc., Aas "is well known. Such an arrangement may be accomplished ,with the provision of circuits vdisclosed in Fig. 2. Each trunk vline l v instead of being provided with only one key E may be rovidedinaddition with mul- `tiple keys and H,'as indicated. -Each of the said keys F and H has a left-hand section which isfan exactduplicate ofthe key E, and in addition a. Aright-hand section whereby the work may be transferred from one' operatorfs position to the' next. 4Normally thekeys'F and H restin the position indicated 'a"t"H.-' If the keyis thrown in one direction the right-hand, set lof springs is.

switched'as shown at F, and if switched in the` reverse direction the",v left-hand set of springs isv operated, y:is-,Shown at E, Fig. 1.

f the operatorat position"#1 (Fig. 2) wishes to 4 transfer all calls coming over the `triinkgline corc'l'uctors 115. and -116, the key the right-hand d as shown in Fig. signals will appear lamp and thus-re- 2 whereby the incoming the `incoming 'signal's'fto a vthirdpp'erator, etc. `lnFig. 2 the key F is l shown operated .in suchA manner as to transferV the'signal to the lamp 121 VVgization" plac'` s throughdthe signal lamp 121.

'Said circuit l extends from ground. G

to the .springs 78 51 and 77 of ,thefkey E, springs 124 1125 contact point 120. The

latter Contact closes the circuit fthe rotary contact at position.#2. The` relay 66 upon 'ener-V in`-contact -the armature 103 int 1104,- which closes a circuit of the key H, springs 126 and. 127 of the key F, armature 103 contact springs 128 and 129 of the key I" .to the springs 130 and 131 ofl the signal lamp 121 to thence through battery The operator in .136 disengages from the spring 137 and comes in contact with the spring 138. This which supplies the calling substation with battery current for talking purposes. The circuit extends from .ground G through the winding of the differential relay 63, Contact point 105, relay armature 106, springs 138 and 136 and springs 139 and 140 of the 4key H to the springs 141 and 142 of the key F, through the Winding of the vertical line relay 58, thence over the circuit as previ-' ously traced to the battery B and to ground G.. The talking lcurrent energizes the vertical relay 58, which latter o perates with known results. The release of the signaling apparatus when the key H is in normal position is .brought about when the subscriber A restores. the receiver 2 to the switch-hook 3 and simultaneously grounds both the vertical and rotary line conductors V79 and 80, respectively. This results in a flow of cur-l rent from the substation ground (Si1 to the release-springs 32, 33 and 34, thence over the conductor 79, through the line relay 58, vsprings 142 and 141 of the key F, sprin 's 'V140 and 139 and 136 and 137 of the key il to the battery lead 84, thence to battery B and to ground G. The current How over i line has already been'- traced.A The energization, of the vertical `relay 58 `closes in contact the armature 107"and the relay 52 of the first-selector in series with the release relay 62 'of the signaling apparatus, With the result that the said'slgnaling apparatus and first-selector .are released' and fully (restored, as previously described. Thus it will be seen that When the .kevs E, F and H are in n'ormalposition all of the incoming calls over the trunkconductors 115 and 116 are received by the first operator, and when the key-F is operated, as shown in Fig. 2, and the normal, the incoming calls are transferred from the first operators position to the secondy operators position; likewise, when the key`.H is thrown, operating ther springs on the right, t he key F remains as shown,` and then the incoming signals pass from i point 104,

the key H, through point 109, which places the release A keys H .and E remain at if ya l ,4 J ,thefirst and second positions to thethirdk z L, operators position." Furthermore," itvwill be.`notic drtl1at the springcombination'ofI ff, g, l'theleft side of'tliekeys F and H is exactly like thespring` combination -offkey E, 'The sprinL'sJGQ andf'() of theI key E, like the corl,responding springs 133 andlat, and-:3,143 Landl'lltof the keys Hand F, respectively, t V areconnecteddirectly with the conductors" i122 and123. ..The springs 68 andTl ofthe.

.keyvE-connect With thefoperators Setfg. also f f the similarsprings132'and 135 and '145' and 1146 .of'their respective' keys H` andr F con- "nectwith thev operators 'setfo-f their' respect `4 tiv'e positions.,r The'fspring 'Z5-.andthecor-- `responding springs 137 `and 146oftl'1e 'keys A and F, respectivelyfarel connectedf'ivith thea battery-1'eadzS-.vv The'fspring 741` (1F-ig.` Al) i, =`fconnects-witht the vertica1-1relay58';'butin v vFig. @fthe connection with the said relay is i i #from the spring "17 4 to the' springs 1447 v and ,lflfwnwhen" th'ekey 'i'sjthrown and the krighthande-.set ofi "springsA is j operated, and-'to Springs i141 and`142'of thekeyF andtothe vertical',relay` V58. .The corresponding'spring 136i fof'zthekey. 'H connects 'with thefsame f relay :through the slaringsf139=and140 'of i, 1thekey-` H, springs 111 and 142 of key Flto l,the vertical lrelay 58. Also., the e'orrespond-A fspring'148offthey1iey F conneets'yvith t'hesaidrelay through VVthe-springs 149 and l11.42 l.Whenthe' key Fjis in' normalposition.v

-The spring' 76 and' the corresponding vsprings 138`aridj ,150, of the keys-Hand F, respec y l 'l ""tively,areconnectedfwith.the armature-106, ,1

'hundred andl ififtyohns each.

j .From-fh; fwgomgiit will beet-mehr 4am call `.o 1 signalis received,

. ':From theforegoing' 1t1 will beseen that. e

Aone oigniore operators"A or; attendantsidtele-- r `pl inescan belocateflonone line', and; that" suc1i`line-is-in`the-,nature of aj telephone line, iri'aslrnucl1,L as ity leads directly to af .tele-I 'L 'phone'on'telephones In `such case r'neans are inoviled, as'E explained, for enabhng` a 'calling el|l)sci-iberk `\vho.-e1tclephone v'receives ilkingcurrent fromfthe exchange or central station'to `autornatically selectg the first idle one, of Said. telephone lines, If-these special linesfforjthefoperators or Vattendants then the other levelsl may be devoted toregular' service-f that isvto. say,'they may have ordinary trunk. lines'A leading thereffro'r'n'. For'the broader purposes of my in-1 vention, however, it' is not vnecessary thatv these spcial l1nes`for the operators or at-v springs 126 and 12T, 124311117125, andA 77v 'and-7 8 'produce additional breaks' in' the circuits` of "the operators or attendants signaling lamps, so that thesejamps will be" jextinguishedby the operation of thel keys, y since' the 'signalfrelaly 66de retained energizedveveri after fthefvoperator throws her key., As shown, and for the more sp'ecic J purposesof vmy invention, these Aspecial televphone lines for' ythev operatorsor attendants are-:in thenature of one-'waylines-f-that isl to say,1theyare Vadaptedy for 'calling only in one direction;y Y Inl other' words, they 'are adaptedo'nly frfthe ytransmission, of inn n'lead from a certainhlevel ofthe first-selector,

coming calls, and' -not-.for the' transmission.

'of outgoing calls. ,In this way each oper#- ator r `or attendant" can. receive Acalls over thesev 'special lines, but cannottransmitl any ,callsy -ov'e'rfthe sameiir the' oiplposite direction. When Aan operator orf'ffatt'endant ref ceives instructions, froma callingsubscriber,

long-,distance connection `canlfthen befma'de or trouble reported,l according-to the duties.

' of the attendant receiving the message from theV calling subscriber.; Obviously, .all ,tenb

of the special telephone ,lines *0f course,-

' if@.`there should lbe tenpgreups 'offselectors the saine operator` cansuperintend the ten circuits 'froinneach-fof theften groups,l or

' contacts irrany certain `llevel--*say the tenthlv 1'eve1;of`a selector canfbe appropriated'foi'4 special 'servicein' callingI operators or atl tendamtsat the 'exchange or central station,

so that each 'opratoncan 'supervise al1 ten y one vhundred circuits i'nall. y, `rEvidently when.

rone hundred circuitsv are too .much for one. operator any number 'of them may betransfem-ed to another operator.V asexplamed. If

'desired ythese special telephone'y lines could be'extended to an ther station "r eicliang'ei` to ena-ble a calliligwsubscribefr of Aone exchangeto directly `call an loperatorA or nttendant :at the 'o her --exchangri GbVOUSlY ductor being used for 2i-leasing purposes, as

man-v 'other ilsesfrr-,y my in\ention "will sag gest themselves to! those-skilled 1nlv the 'artjr'v' A' in addition to. thosefwhich 'I have -inenl Nforysupplying-operating' current from the yWell-as for inclusion in the energizing circuit v'of therelay which controls the line lamp signals associated with the operators telephones. During conversation it will be seen that, the common battery or centralized source of operating and talking current is kbridged across the special service vline or circuit through the medium of relay-coils associated with said special service line or circuit.` 'In this Way current for talking purposes is supplied over the special service line or circuit to the calling subscribers line;

` .'What I claim as my invention is l. In a telephone `exchange system, the combination of a line, a plurality of operi ators` or attendants telephones on said line, a visual signal for each telephone, a calling subscribers line, automatic means for con-A necting the calling line with the other said J line, parallel circuits for said visual signals, relay means controllingsaid circuits, means by which one operator or attendant may direct the incoming calls to the visual signal of the next operator, and means for supplying talkingcurrent over a portion of said first lineto the calling subscribers line. "2., In atelephone exchange system, the combination of a line, a pluralityy of operators or attendants telephones on said line, Va*call-receiving device for each telephone, calling subscribers line, automatic means for connecting the calling line with the said other line, means by which one operator may i5 disconnect fromV the line and direct all incoming calls to the next operator, and means for supplying talking current over a portion ofv said first line to the calling subscribers line. ,40, In a telephone exchange system, the combination of a calling subscribers line, a special service line, a telephone `on said special service line, a call signal for said telephone, trunk lines for regular service, automatic means for connecting the calling line with thefspecial service line, and means for supplying talking current over a` portion of the special service line-to the calling subscribers line. A i i 4'. In a telephone exchange system, Athe combination of a calling subscribers line, trunklines for regular service, apluralityv ofwspecial service lines, telephones on said '5 special service lines, an automatic selector- ),5, switch adaptedtoestablish connection with y the first idle one of said special service lines, orwith the rst idle trunkline when used l ltor regular service, a centralized source of talking and4v operating current, connections,

. said source to the s aid selector-switch, and -means` for bridging the saidsource across the automatically .selected specialv service line to supply talking current to 'the 4 calling 65. subscribersvline.

said third relay,

.cuit for said second relay,

5. In a telephone 'exchange system, the combination of a calling subscribers line, a special service line, automatic means for connecting the calling line with the special service line, a telephone on said special service line, a visual signal associated With said telephone, a listening-key for connecting the telephone With'the special service line, a circuit for said visual signal, a relay for controllingr said circuit, an energizing circuit for said relay, a second'relay for controlling said energizing circuit, and a local locking circuit for said second relay.

6. In a telephone exchange system, the combination of a calling subscribers line, a special service line, automatic means for connecting the calling line with the special service line, a telephone on said special servvice linea visual signal associated With said telephone, a listening-,key for connecting the telephone with the special service line, acircuit for -said visual signal, a relay for controlling said circuit, an energizing circuit for said relay, a second relay for controlling Said energizing circuit, a local locking circuit for said` second relay, a third relay controlling 'said local circuit. an energizing circuit for vsaid third relay, and two additional relays controlling'the circuit of Said locking circuit being also controlled by the second relay itself.

7. In a telephone exchange system, thel combination of a calling subscribers line, a special service line, automatic means -for' f connecting the calling line with the special 100 service line, a telephone on said special servlice line, a visual signal associatedwith said telephone, a listening-key for connecting the telephone with the special service line, a circuit for said visual signal, a relay for con- 10F trolling said circuit, an energizing circuit for said relay, a second relay fpr controlling said energizing circuit, a local locking cira thirdrelay controlling said lo'al circuit. an energizing cir- 110 cuit for said third relay, and two additional relays 4controlling the circuit of said third relay, said locking Ycircuit being also con- 1 trolled by the secbnd relayitselfgthe said first-mentioned relay having another euere' 115 gizing circuit controlled by the two additional relays.

8. A telephone exchange system provided 'with aline, an opera-tors or attendants telephone onsaid line, a visual signal associated with said telephone, suitable meansbywhich a calling subscriber may make connection with said line, a circuit for' said visual signal, a relay controlling said circuit, two energizing circuits -for said relay, k

a relay controlling one energizing circuit,` and another relay controlling the other cnergizingcircuit.'

"9. A telephone exchange system provided with a line, an operators or attendantsghtelel12(7) krsignal when the 'selector establishes conne lion with a special 'serifice line, alealling sul. "seriheifs line '0 j he selector, said' selector providec K Itoumtihiiieans"foi-causing iiirto sto Y or ooiiie -i'i-si, on tlieuil-rsifidle trunk linel'orfoii the aqcordingi "to the phoneon said line, a yvisual 'eallsignal assolcialed with said telephone, a key-switch for Connectingftlie'*telephone with the line, suitl l abley means by uliih a calling subscriber Connectshiiiiseli vwith said line fandcau'ses llie displayof said signal, means for restor- :aing lsaid signal upon the ac tuation of ysaid ing'a displayof saidlsignal when thevoperaf* toi're'stores the lcey' L noi'iijial]il'iositio'ii. p y

Y10;4 In telephone exchange system, an

opeiators for attendaiits telephone;` a' visual signal 'associated with said vrteleliihoiie, mea ns forj'operating said signal-to eause'a display thereof,y a key-switeli proif'ided avith means for retiring' said signal, 'ivlieii the'telephone`v l; is brought into use,` and'grelay means forl fpreifenting ay display of said signal `when the A-ltey-suitcli .is ifestoredlo rnormal'-po'si,n

y .711'. loa telephone "exchange system,l the vtor {telephones-'onsaid lirstfment'ioiied line,

- a eiillfsi'giial uassociated with each telephone,

y y eomlgiin'atiouLof aralliiigz, subscribe s line, a i special .service line, a subserihei"sy individual fswitch, for automatically establishing conf` nectioii 1Wlitli K sa idy line `V trunks for* regular fswitoliv a telelihone ou said special' service,

linegfa all-signal 'associated with said `teley.coinhiiiatioiyofsi'unkflines for. regular sorva liankoi" irontats orlerlniiifals1inil'lof said lmestermmate, telephones on said*r special servize lines7` eall-,signalsasililefl'l" ivitlll iid telephones, Vlautoii'iatir means fonca lisini;r the opeiiatioijiyf a' call-* fj ii l le sicial rservizlie line, rter of tliejoall."

means by which one operator kmay direct the i y inroiiiinggautouiatic calls tothe next oper:kn ,",jtoi'gaiul uien-nis for supplyingtalkingr eur- 1 rentoi'eifaportion of said first line fto the calling siilisCi-ibes line.'

service also leading from saidindividual@ ,A combination of a` cf'illing'y subsribeisline, 'a

centralized soureeof V`talking current for said subscribers line, ay oneiway special service line a'claptedfor'calling only in fone'dil rection, ywhich. special service 'line 'lisnoty 70.`

available forservicebetween other lines, a

telephone' onsaid special service lineya call-r signal associated ,W-th'said telephone7 sub- Y somber-controlledautomatieineaiis b `which connection` sestablishedbeliweenft e sul "f7` y scribers line andfthe special service line, airtomaticm'eans for causiiigftlie operation `of said signalwhen connection lis made .with` 1 the* specialy seivicejline, an yimpulse-trans yphone.,` and n ueai'isincludingv al relay' for au-,j v aidsigp 4 nal iyhen the; individual switch 'establishes lior liridgngitlie said ysourcevavross vtli'e aufwitli saidj line,

mittinff mechanism fforftphe callingv line, adaptgd to `control saicl` means for connecting `with the truiilg ,andahook-switchfon thea-llingline butfseparate from said. inleclian'ism.v -v i f 15,. In a :telephone exchange. systfeiii,A 'the combination of' a plurality fof lilies,r 1 telephones'- fr `said flin'es; K operators? keyj switches foi-*connecting said telephonesv with said flinesya Visual signal assoeialsed with 90 each y vtelephone relays" controlling each.' sig-y .tomatically placingftli'efcalling line in conf' lines nieanscoiitrolled byfone' of said relays for automatical* Yoperatiiiggf they visual Isignal of one of said'f telephones wlienjf-such a' yConnection is established," 'nfieans` controlled y' by anotlieroi said relays for rendering saidr signal i inoperative, -rand :means foisupplying talkin'g current {drei-"thecalled line .to .theasuhsorihei"s telephone., j j .16, In a'telepline exoh'angesysliem,the'f `(-,oii-iliinati'oii offa'ialling Vsulisri befrs line, vtrunk lines lfor. regular vser-vice;,af 'plurality `ofv 'special service A"l ines, telephones onf said special servieeilinesganf aulmuia'tioselecto switch adaptegl'toy es ablish connectionwith v anyidle one of- -said'sl ecial"service lines,v or. ivith an idle trunk-linefwlienu ed'forregu-'- laiwseryice, a centralized! soul-begofalking source to `-,the said selector-switoh,and 'riieaus Q; supply .talking oui-rent toftlie. milling' sul- Lscrihers line. H 'l f 7. ylnfa telephone exchange system, theromlii nation offa. 'li neu having);Y ,af third @mp v 12av iblishin-g1:connection l f release 'iiiecliani'sm` ,-gfor.. .said

duotor. a telephoneonfpsaid line, automatic switvliin'g means ,iorx

fautoinatio -siviteliiiig gni'eans, -a -releasezircuit i nclu'ding y said rthird oo riduotor,'Y` and :means '418. "ln a telephone/ exchangie'` sys-teimfthe v y combination of"aflinehaving a ythird con-ul n l s Y. y dutor,atelephoneongsaid line, lautomatic' lnfafrtele honeeichanie sistem the ,s y PY .Y

50 v telephones on said special service lines, callallotted to said line and controlling nor' lmally open switch points in said circuit.

' said telephone with said other line,

means including an operators listening-key ton'iaticuieans for causing the operation of.

with said line, release mechanism for said f automatic switching means, a release circuit including said third conductor, and relays 19. In a telephone exchange system, the combination ofa line having three conductors, automatiemeans for establishing connection withv said line, release mechanism for said automatic means, a release circuit including the third conductor of the line, a

telephone allotted to said line, means for connecting the vtelephone with the two main conductors of said line, l and relay means allotted to said line and controlling the said release circuit. i

420. In a telephone exchange system, the coinbinationof trunk lines for regular service, a plurality of specialservice-lines or circuits, a calling subscribers line, automatic means by which the calling subscriberselects an idle special service line or circuit,.

or an idle trunk line, release mechanism for said autoniaticnieans, means allotted to said special servicelines or circuits and adapted for controlling said release mechanism, tele-V phones onsaid special service lines or circuits, a signal for each telephone, and a common battery o r centralized source of current for furnishing current to the calling subscribers line for talking and signaling purposes. l

21. In a'telephone exchangev system, the combination of a calling subscribers line,

vanother line, a telephonepav common battery,

automatic means for establishing connection from the calling line to the said otherline,l operators switching means for connecting 1 said having provisions for establishing the flow of talking current tothe calling subscribers line when the operator listens-in.

22. In a telephone exchange system, the

combination of trunk lines vfor regular ser# vice, a plurality of special service lines, which lines are-not available for service between other lines, an automatic selectorswitch having a bank of contacts or termihals in which allof said linesterminate,

signals associated withsaid telephones, au-

a call-signal when the lselector establishes connection with a special service line, a calling subscribers line, means for enabling the callingr subscriber to start the operation of tlieselector, said selector provided with automatic means for causing it to stop or come to rest on an idletri/ink line, or oii anlidle special service line, according to the character-of the call.

. 23. In a telephone system, a line having;

a third conductor, a bridge on said line, a

'switch for making connection to saidline,

responsive to the calling subscriber,means in said bridge responsive to the calling ysubscriber forvreleasin'g said switch over thetliird conductor, and a ltelephone Vfor saidlin'e.

2l.. In

bridge on said line, means for extendinga call'to said line, a telephone for said line,

means for supplying talking current over sai-d bridge and line in the direction of the calling subscriber, a signal atc the telephone,

and means controlled by the relay of said bridge res onsive to the calling subscriber for contro ling said signal.

25. In a' telephone exchange system, thecombination of a line having a third conductor, a telephone on said line, a signal for said line controlled over said third conduc' 26. In a telephone exchange system, the

a release circuit including said third v 7o a telephone system, a line, a relay Awith said first line, release mechanism for circuit including said third conductor, land means allotted to said first line and adapted for controlling said release circuit', said-last i means controlled over said calling line.

said*- automatic switching meansfa release 27. In a telephone system, a line having y a third conductor,.a signal for saidline controlled over'said third conductor, a bridge on said line, a switch for making connection with said li-ne responsive to the calling s ub-y scriber, means in said bridge responsive to the calling subscriber for releasing said switch over said third conductor, and a telephone for said line.

Signed by me at Chicago,l Cook county, Illinois, this 218th day of September, 1906.

BERNARD D. WILLIS.

-Witnesses:.

Eowmi'n D. FALEs,' ARTHUR B. Sunni.

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