US1337712A - Telephone system - Google Patents

Description

A. E. LUNDELL.

TELEPHONE SYSTEM.

APPLICATION FILED ocr.1o, 1911.

Patented Apr. 20, 1920.

4 SHEETS-SHEET l.

@SMT Patented Apr. .20, 1920.

4 SHEETS-SHEET 2.

A. E. LUNDELL.

TELEPHONE SYSTEM.

APPLxcATloN FILED 0cT.1o,1917.

A. E. LUNDELL:

TELEPHONE SYSTEM- APPLICATION FILED ocT` Io, 1917.

Patented Apr. 20, 1920.

4 SHEETS- SHEET 3.

A. E. LUNDELL.

TELEPHONE SYSTEM.

FFIC.

ALBEN E. LUNDELL, OF NEVJ YORK, N. SEGEOB TQ WESTERN ELECTRIC COMPANY,

INCORPORATED, OF YLT-SRX, Il?.

.n CGL-FOBATION OF NEW' YORK.

TELER'GNE SYSTEM.

neer/,file

Specification of Letters Patent.

- Patented Apr. 20, 1920.

To all yfv'iomf t may concern le it known that l, ALBEN E. LUNDnLL, e oi? the FUnited States, residing` et Yer-li, in the county of Bronx land of New vforli, have invented certe-in ,.stein concise, and exact description,

lhis invention rele-.tes to telephone sysend more particularly to the control or siffrnling inea-ns employed in telephone systems.

ln semi-autorisatie telephone systems, especially enlls from i senil-automatic to a hice, it is necessary to indicate t operator the number oic the celled ers line. ln the present practice, if: is .-nstoniery to indicate tlie number ol" the called subscriber by the display of e set i properly arranged lamps before said B I eintor. rlhe lightingr of the lfinips oi" this Controlled by sending devlre operA answering or A operator. ln ion of this niiniber-indicating or ino ins, it is essential that the set lief-ore B operator shell be re- .rnediately from :i ti'nnlr es soon operator has connected seid ti'nnlz is the to the Called line, in order that another triinlr i seize ziet-nete said set of this invention resides ineens to inimedietel indicator leinps es soon e. trnnl with which it is associated hfi into the liek of the celled line. i" re, it lies been necessary to Weit ne trnnlr seqiiense switch hes rotated proper ringing position `before the released. The drawings, with placed shove Fig. 9, Fig. 2 pleeed e 3, and Fig. 4 placed :it the left of Fig. dingrnmmetioally represent e portion ot zi telephone system employing the present invention. l dingrznninntioelly represents indicators or circuit-controlling devices for the number leinps. nig. 2 din.- lL'minnietie ily represents s trunk iinder, nn ellotter for ellotting any one of e. plurality of trunk finders for use, and zi lamp allotter for associating zi set of number lsnips, of Whioh only one set is shown, with e. trunk on which graininat a cell has originated. Fig. 3 dia,- ieelly represents :i trunk, a. B operntors oord oironit and celled line. Fig. el dingrainnintioally represents Calling line,

operators oord circuit, si selector' switch for extending the selling line to the l operutors position, and e sender for oonti'olling eaters.

selector switch sind the indillfitliin the dotted rectangle at the eX- ireine right of n lotter. r lfty of loot het switolies an idle t is ter, there is o. second dotted :n which there is indicated en ellottei'.

indicators,

ig. 2, there is indicated :in This :illotter is common to e. plutriinlr finders end operates to setrnnlr finder to Cero Jfor the next originated. .it the left of this rectangle is also Connnon to plurality .finders and operates to associate :in number indieziting lamps with e which :i cull has originated.

zifllotters and seqiienee employed in the system are similar trut-ture to the sequenoe'sviteh dis- :losed in Reynolds-Baldwin Patent No.

l,l97,8='38, and similar in operation find. l'unotion to tne sequence switches disclosed in MoBei'ty letent No. 1,125,579.

'l'he trunk finder of this system is similar 7nolds nino'e to Vnml irliieh ne control in struf-tiire to the siyitoh disclosed in Craft- Pntent No. 1,123,696.

l this description, reference will be zi fundamente-l circuit. This funoiroint ineludes a. stepping relay, tristes Counting devices under the of registers (not shown), set by the rstor in initiating a Call. dis-..-osiire or A Complete the fundamental circuit, and

oi' lire stepping relay and registers, Will be found l.l 38.3l9.

llllien nieves his reeeiyv i' for line relay l0 is ed b L enter l l rater, serts the .ttery, left-hand Winding ernietiire and linolr L eens zit been: Contact of relrm the. intent to Lundell, No.

of relay l0, to ground.

(not shown) to control the selector into the jack 13 ot the calling line. ,Hrter ascertaining the number of the called party, in a manner not shown but well known in the art, the 11 operator operates a keyboard switch 50 and the indicators shown in Fig. 3. complete description ot the operation of the selector switch 50 may be obtained from the Lundell' patent, No. 1,163,319, above mentioned.

As soon as the brushes 51, 52 oi' the selector switch 50 engage the terminals 302 and 304C of an idle trunk leading to the B operators position, the fundamental circuit is extended to the line relay 306. rlhis circuit may be traced from grounded battery, contact 307, winding ot relay 306, contact 308, conduct-or 303, terminal 302, brush 51, lower contact spring 54, winding of relay 55, back contact and armature of counting relay, contact spring 56, lower contact of spring 57, conductor 53, brush 52, terminal 304, conductor 305, contact 309, to ground. Relay 306 becomes energized and completes a circuit from grounded battery, power magnet of sequence switch 300, contact 310, righthand front contact and armature et relay 306, to ground., to move this sequence switch into position 2. A circuit is now completed to relay 201 from grounded battery, winding of relay 201, contacts 202, 203 and 311, to ground. Relay 201 attracts its armatures and completes a circuit from grounded battery, winding oi; power magnet of sequence switch 200, contacts205, 204, front contact of relay 20,1, to ground, to move the sequence switch 200 into position-2. As soon as the sequence switch 200 rotates through position 1g, the relay 201 is energized'over a circuit from grounded battery, winding of relay 201, contacts 202 and` 209, baclr contact and armature of relay 210, to ground. 1n position 2 ot' sequence switch 200, the circuit for the updrive magnet 206 is closed from grounded battery, winding of updrive magnet 206, conductor 20T, contact 203, front contact and right-hand armature of relay 201, to ground. The trunk inder switch, designated as 212, elevates its brushes under control of the updrive magnet 206 until the brushes o1' the trunk .finder 212 have reached the terminals of the trunk to which the call has been extended. As soon as the brushes engage these terminals, the relay 210 is energized over a circuit from grounded battery, winding of relay 210, contacts 213, 214, 215, 216, brush 217, terminal 218, conductor 219, contact 312, to ground. Relay 210, by attracting its armature, opens the'energizing circuit of relay 201, but relay 201 remains energized until the brushes of the trunk iinder 212 have been properly centered on the set of terminals. This holding` circuit maybe traced from grounded battery, winding of relay 201, Jfront contact and left-hand armature oi' relay 201, conductor 220, contact 221, conducting portion of the commutator 222, brush 223, to ground. When theV .brushes of the trunk iinder have been accurately centered on a terminal set, the brush 223 rests on an insulated segment of the commutator 222. The relay 201 then becomes denergized and completes a circuit from grounded battery, power magnet of sequence switch 200, contact 224C, back contact and right-hand armature ot' relay 201, to ground, to move the sequence switch into position 3, whereupon the circuit ot updrive magnet 206 is opener. lilith the sequence switch 200 in position 3 and relay 210 energized, a circuit is completed from grounded battery, winding ot' power magnet ot sequence switch 300, contacts' 312, 313,- conductor 314, terminal 225, brush 226, conductor 227, contacts 223, 21e, "front contact and armature oi' relay 210, to ground, to move the sequence switch 300 into position 3.

Relay 306 is still maintained energized by a circuit from grounded battery, contact 307, winding of relay 306, contact 315, left-hand armature and iront contact of relay 306, contacts 316, 31T, over the fundamental cir cuit previously described, to ground, through contact 309. A circuit for relay 201 is now completed from grounded battery, winding ot' relay 201, contacts 202, 230, brush 231, terminal 232, conductor 233, contacts 31S, 319, 'liront contact and right-hand armature of relay 306, to ground. The energization ot' relay 201 completes a circuit from grounded battery, power magnet of sequence switch 200, contacts 205, 201, front contact and right-hand armature of relay 201, to ground, moving the sequence switch 200 inte position t.

The circuit for indicator 100 is now com pleted "from grounded battery, magnet of indicator 100, contact 111, conductor 1112, contact 213, conductor 220, left-hand armature and front contact of relay 201, contacts 202, 230, brush 231, terminal 232, conductor 233, contacts 313, 319, tront'contact and right-hand armature ot relay 306, to ground. 11s the indicator 100 rotates through its various positions, it closes the Contact 109. Each time the contact 109 is closed, a circuit for shunting the stepping relay 55 in the "fundamental circuit is completed from grounded battery, contact 307, winding of the relay 306, contact 315, letthand armature and front contact of relay 306, contacts 316, 320, conductor 321, terminal 234, brush 235, conductor 236, conductor 112, contact 109, conductor 110, Contact 242, front contact` and right-hand armature of relay 201, to ground. rhe indicator 100 continues to rotate, thereby shunting stepping relay 55 until the series of counting relays (not shown) has been energized. The counting relay of the series of counting relays mentioned operates to interrupt the fundamental circuit, thereby causing the relay 306 to denergize. Then this relay 306 denergizes, the relay 201 has its energizing' circuit interrupted. Relay 201 deenergizes and closes a circuit for moving the sequence switch 200 into position This circuit may be traced from `rounded battery, magnet of sequence swit-h 200, contact 244, conductor 245, contacts 113, 114, 115, 116, 117, 1'18, conductor 120, contact 246, conductor 247, back contact and righthand armature of relay 201, to ground.

Meanwhile, such circuit changes have taken place at the sender that the counting relays are in readiness for reoperation. The fundamental circuit is again completed from grounded battery, contact 307, winding oi' relay 306, contacts 315, 322, 323, conductor 241, terminal 240, brush 239, conductor 238, Contact 248, conductor 249, contacts 127, 106, 105, 104, 103, 102, 101, conductor 236, brush 235, terminal 234, conductor 321, contacts 320, 317, over .the fundamental circuit, previously described, to ground, through contact 309. The relay 306 attracts its armatures and completes a circuit from grounded battery, winding of relay 201, contacts 202, 230, brush 231, 'terminal 232, conductor 233, contacts 318, 319. front contact and righthand armature of relay 306, to ground.

ln position 5 of the sequence switch 200, circuit is completed for the indicator 122. This circuit may be traced from grounded battery, magnet of the indicator 122, contact 123, conductor 124, contact 250, conductor 220, left-hand armature and front contact of relay 201, contacts 202, 230, brush 231, terminal 232, conductor 233, contacts 318, 319, front contact and right-hand armature of relay 306, to ground. As the indicator 122 rotates through its various positions, it closes the contact 125. Each time this contact 125 is closed, a shunt about stepping relay 55 of the fundamental circuit is completed. This shunt circuit may be traced from grounded battery, contact 307, winding of relay 306, conta-ct 315, lefthand armature and front contact of relay 306, contacts 316, 320, conductor 321, terminal 234, brush 235, conductor 236, conductor 112, contact 125, conductor 110, contact 242, liront Contact and right-hand armature of relay 201, to ground. The indicator 122 continues to rotate until the contact 125 has caused the stepping relay 55 to successively actuate the counting relays, the number of relays actuated being determined by the setting of the registers mentioned, but not shown, When the O counting relay has been actuated, the fundamenta-l circuit is again opened to cause the denergization of the relay 306, which, in turn, causes the denergization of relay 201, as previously described. The denergization oic relay 201 completes a circuit for moving sequence switch 200 into position 6. This circuit is completed trol i grounded battery, magnet ot sequence switch 200, contact 251, conductor 252, contacts 126, 115, 116, 117, 118, conductor 120, contact 246, conductor 247, back contact and right-hand armature of relay 201, to ground.

The indicators 127, 128, 129 and 130 are successively operated in the same manner as described in the operation of the indicators 100 and 122. These operations are fully described in a copending application, F. N. Reeves, Serial No. 127,659, filed October 25, 1916. The setting oi the various indicators controls the actuation of the sets of lamps (similar to the set 139 shown), to indicate the digits of the desired number. The set of lamps 139 is arranged to be actuated through the contacts 140 and 141 of the indicators 100 and 122, or through the contacts 140', 141', inclosed within the dotted rectangle and controlled by other indicators similar to 100 and 122.

lt will be understood that the fundamental circuit is completed and the relays 306 and 201 are energized during the setting of each of these indicators. At the close ot the setting ot' each of these indicators, the fundamental circuit is interrupted, as described, and the relays 306 and 201 are deenergized. Each time the relay 201 deenergizes, a circuit is completed to advance the sequence switch 200 one position. At the close of the setting of all the indicators, the relays 201 and 306 will be denergized; the sequence switch 300 will be in position 3 and the sequence switch 200 will be in position 9. At this time a circuit will be completed for a sequence switch (not shown), associated with the selector 50, for causing the contact springs 54, 57 to disengage their lower contacts and to engage their upper contacts. As soon as the relay 201 deenergizes, after the last indicator has been t, a circuit is completed for moving the quence switch 300 out of position 3 and into position 4. This circuit may be tra-ced from grounded battery, magnet ot sequence switch 300, contact 344, conductor 346, ter minal 280, brush 281, conductor 283, contact 134, conductor 120, contact 246, conductor 247., back Contact and right-hand armature of relay 201, to ground. In posi tion 4 of sequence switch 300, a circuit is completed fromgrounded battery, contacts 331, 332, winding of relay 330, conductor 393, upper left-hand winding of repeating coil 390, conductor 303, terminal 302, brush 51, conductor 53, upper contact of spring 54, upper right-hand winding of repeating coil 70, to ground. The energization of relay 330 completes a circuit from battery, contact 333, iront contact and righthand armature of relay 330, contacts 334, 335, conductor 336, left-hand winding of relay 337, to ground. rl`he relay 337 attracts its armatures, and, at its right-hand armature and front contact, completes a locking circuit tor itself from grounded battery, contact 339, right-hand winding of relay 337, contacts 338, 313, right-hand armature and if'ront contact of relay 337, to ground. Relay 337 is, therefore, maintained energized by the circuit until the sequence switch 300 moves out of position 7 it the right-hand armature and iront contact of relay 337, a circuit is also completed from grounded battery, winding of relay 210, contacts 213, 223, conductor 227, brush 226, terminal 225, conductor 314, right-hand armature and front contact of relay 337, to ground. rlfhe energization of relay 210 completes a circuit from grounded battery, magnet of sequence switch 200, contact 253, iront contact and left-hand armature or' relay 210, to ground. This circuit operates to move the sequence switch 200 out of position 9 and into position 10. As soon as the sequence switch 200 leaves position 9, the circuit of relay 210 is opened through contact 213. in position 10, the circuit for relay 201 is completed from grounded battery, winding ot' relay 201, contacts 254, 228, conductor 227, brush 226, terminal 225, conductor 314, right-hand armature and iront contact of relay 337, to ground. The deenergization of relay 210, previously described, completes a circuit for moving the sequence switch 200 out of position 10 and into position 11. The circuit is traced from grounded battery, magnet of sequence switch 200, contact 255, back contact and armature of relay 210, to ground. As soon as the sequence switch 200 reaches position-10, with the relay 201 energized, the relay 256, which controls the setting oi the lamp allotter 261, is energized over a circuit from grounded battery, winding of relay 256, contact 257, resistance 259, contact 260, conductor 220, left-hand armature andk iront contact of relay 201, contacts 254, 228, conductor 227, brush 226, terminal 225, conductor 314, right-hand armature and front contact of relay 337, to ground. Relay 256, by attractits armature, opens a breakpoint in the operating circuit of the allotter 261 for a purpose hereinafter described. rlhis relay 256 is maintained energized until the sequence switch 200 moves out of position 14.

.lilith the sequence switch 200 in position 11 and with relay 256 energized, a circuit is completed from grounded battery, winding of relay 210, contacts 267 ,268,269,back congrounded tact and armature of relay 264, front contact and armature of relay 256, Contact 263, front contact and right-hand armature of relay 201, to ground. Relay 210 attracts its tures, and completes a circuit from grounded battery, 'ivinding ot magnet ot sequence switch 200, contact 253, Jiront contact and armature of relay 210, to ground, for moving the sequence switch 200 into position 12. is soon as the sequence switch 200 reaches position 12, a circuit is completed i'rom grounded battery, winding oi' relay 264, conductor V265, contact 131, conductor 145, contact 266, to ground. Relay 264, by attracting its armature, prevents any other relay similar to relay 210 `from being energized when the allotter picks up the finder with which such relay is associated, as will hereinafter be described; lVhen the relay 264 attracted its armature, it openedY the energizing lcircuit of relay 210. The deenergization of relay 210 completes a circuit from grounded battery, magnet of sequence switch 200, contact 255, back contact and armature of 210, to ground, for moving the sequence switch 200 into position 15. As soon as the sequence switch 200 reached position 14, a circuit was completed 'from grounded battery, magnet of indicator 122, contact 180, conductor 181, contact 299, to ground, for moving the indicator 122 into position 4. .ln position 14 of sequence switch 200, a circuit is also completed from grounded battery, contact 325, winding ot relay 324, contacts 326, 318, conductor 233, terminal 232, brush 231, contacts 230, 209, back contact and armature of relay 210, to ground. The energiaztion of relay 324 completes a circuit from grounded battery, lett-hand armature and front contact of relay 324, contact spring 327, contact328, winding of relay 306, contact te ground. Relay 306 becomes energized and completes a circuit from grounded battery, magnet oit sequence switch 300, contact 310, rpront contact and righthand armatureoi relay 306, to ground, moving the sequence switch 300 out ofposition 4 and into position 7. 11s soonV as sequence switch 200 leaves position 14, theholding circuit of relay 256 is opened at contact 260. Relay 256 defnergizes and closes the circuit or power magnet of sequence switch 261 to conductor 284. As soon as another cord finder sequence switch reaches positions 11 and 12, the circuit oi' power magnet ci sequence switch will'be completed at the righthand armature and 'irc-nt Contact oi a relay similar to 201, and the lamp allotter 261 will be rotated until it reaches a position to associate this next trunlr with the set of lamps. As soon as this position is reached relay 256 becomes energized over a circuit similar to the one described. But the sequence switch of the next 'cord finder is not moved out oi position 12 until relay 264 is denergized and thereby prevents the operation ot the lamps by the indicators associated with the second cord tlnder until the pre-ceding call has been erased. ln position 15 of sequence switch 200, the relay 201 is still aiaimgained energized by circuit trom grounds-:l battery, winding ot relay 201, front contact and leit-hand armature or relay 201, conductor 220, contact 298, brush 226, terminal 225, conductor 314, right-hand armature and 'front contact of relay 337 to ground.

rlhe movement of the indicator 122 in position 4 completes a circuit of the lamps as'- sociated with the indicators 100, 127, 128, 129 and 130 to display the number of the desired line in front of the B operator. The B operator then inserts the plug 341 into the ack 394 of the called line. A circuit is then completed from grounded battery, winding of relay 342, sleeve of plug Y341, sleeve of jack 394, winding of cutor'l relay 395, to ground. Since the sequence switch 300 is in position 7 at this time, the relay 337 is still maintained energized, so that the energization of relay 342 completes a circuit from grounded battery, magnet of indicator 122, Contact 182conductor 112, concuctor 236, brush 235, terminal 234, conductors 321, 396, front contact and leithand armature of relay 337 conductor 353, front contact and lower armature of relay 342, to ground. This circuit causes the indicator 122 to move into position 5. lllhen the indicator 122 leaves position 4, the circuit for relay 264 is opened atk Contact 131 to al low the next trunk finder sequence switch to move out of 11 to utilize the lamp set. i In position 5 of indicator 122, a circuit is completed from grounded battery, magnet ot sequence switch 300, contact 344, conductor 346, terminal 280, brush 231, contact 297, conductor 296, contact 295, conductor 112, conductor 236, brush 235, terminal 234, conductors 321, 396, .tront contact and lett-hand armature of relay 337 conductor 353, front contact of lower armature of relay 342, to ground, for moving the sequence switch 300 out of position 7 and into position 8. As soon as the sequence switch 300 leaves position 7, the locking circuit Jfor relay 337 is opened. rlhc denergization of this relay 337 opens the locking circuit of relay 201. The denergization of relay 337 also completes a circuit from grounded battery, contact 333, front contact and armature of relay 330, contacts 353, 352, conductor 351, winding of ringing relay 349, back contact and Varmature of relay 359, conductor 353, back contact and armature of relay 337, conductor 353, front contact and lower armature of relay 342, to ground. Relay-349 attracts its armature to apply ringing cur- .in a similar manner by rent through the winding ot relay 359, contact 360, front contact and lower armature oir relay 349, ring of plug 341, ring of sleeve 394, apparatus at the called substation, tip et jack 394, tip of plug 341, upper armature and iront contact of relay 342, upper armature and iront Contact of relay 349, contact 361, to ground. Relay 359 is marginal and does not attract its armature until the called subscriber has removed his receiver from the witchhool. Relay 359tliere pon attracts its armature and removes the shunt from around relay 350. Relay 350 becomes energized and completes a locking circuit for itselic from grounded battery, contact 333, front contact and armature of relay 330, contacts 353, 352, front contact and upper armature of relay 350, winding of relay 350, conductor 358, back contact and left-hand armature of relay 337, conductor 353, front contact and lower armature of relay 342, to ground. The energization of relay 350 also opens the circuit of relay 349, Eis soon as the relay 201 denergizes, when its energizing' circuit is interrupted by the deenergization of relay 337, a circuit was completed from ground, magnet of sequence switch 200, contact 224, back contact and right-hand armature of relay 201, to ground, for moving the sequence switch 200 into pol siticn 16. ils soon as sequence switch 200 reaches position 16, the indicator 100 is restored to its normal position, over a circuit completed from grounded battery, magnet ot indicator 100, contact 135, conductor 136, contact 235, conductor 247, back contact and ri glitt-hand armature of relay 201, to ground. rlhe indicator 122 is restored in a similar manner over a circuit completed from grounded battery, winding of indicator 122, contact 142, conductor 143, Contact 286, con# a ductor 247, back contact and right-hand armature of relay 201, to ground. The indicator 127 is restored to its normal position over a circuit established through grounded battery, magnet of indicator 127, contact 137, conductor 138, contact 287, to ground. The indicators 128, 129 and 130 are restored circuits completed through contacts 283, 289, 290, respectively. ln position 16 ot the sequence switch 200, a circuit is also completed for the downdrive magnet 274, from grounded battery, winding of magnet 274, contact 271, to ground. As soon as the trunk finder switch reaches its normal position, the commutator brush 272 engages the conducting segment 273, thereby completing a circuit from grounded battery, magnet of sequence switch 200, contact 275, conducting segment 273, Jcmmutator brush 272, to ground. moving the sequence switch 200 into position 17. As soon as the indicators have reached their normal positions, and sequence switch 200 V201, to ground.

Y At the termination of the conversation, the sequence switch, associated with the selector shown in Fig. 4, is moved out of position 16, in the well-known manner, thereby causing the denergization of relay 330. 'Ihe denergization of relay 330 causes the de- -energization of relay 324, which, in turn,

causes the denergization of relay 306. Relay 306, by retracting its right-hand armature, completes a circuit from grounded battery, magnet of sequence switch 300, contact 355, back contact and right-hand armature of relay 306, to ground, to move the scquence switch 300 into position 9. In position 9, the disconnect lamp 362 is lighted in a circuit which may be traced from grounded battery, lamp 362, contact 363, to ground. The B operator, on noting the lamp 362, removes the plug 341 from jack 394 of the called line. Relay 342 de'e'nergizes and completes a circuit from grounded battery, magnet of sequence switch 300, contact 364, back contact and lower armature of relay 342, to ground. The sequence switch 300 now moves into its normal position and the apparatus is in condition for the next call.

What is claimed is:

-1. In a telephone system, an incoming line, an outgoing line, means for connecting said incoming line yto said outgoing line, a

source of ringing current, aV variably operable signal, means ifor associating said signal with said incoming line, means operated by the connection of said incoming line with said outgoing line for disassociating said signal from said Vincoming line, and ineans operated in disassociating said signal from said incoming line ior connecting saidsource of ringing current to said outgoing line.

2. In a telephone system, an incoming line, an outgoing line, means lor connecting said incoming line to said outgoing line, a source of ringing current, a signal, a switching device for controlling said signal, means associated with said incoming line 'for operating said switching deviceA to associate said signal with said incoming line, means operated by the connection of said incoming line with said outgoing line for operating said switchingdevice to disassociate said signal from said incoming line, and means operated by the last'mentioned operation of said switching device for connecting said source of ringing current to said outgoing line.

3. In a telephone system, an incoming line, an outgoing line, means for connecting said incoming line to said outgoing line, a circuit controlling device controlling the connection between said lines, a variably operable signal, means for associating said 4. In a telephone system, an incoming Y,

line, an outgoing line, meansfor connecting said incoming line to said outgoing line, a circuit controlling device controlling the connection between said lines, a signal, a switching device for controlling the operation of said signal, means associated with said incoming line for operating said switching device to associate said signal with said incoming line, means operated by the connection of said incoming line with said' outgoing line for operating said switching device to disassociate said signal :l'rom said incoming line, and means operated by said last mentioned operation of said switching device for operating said circuit controlling device to complete the connection betweenY said lines. y

5. In a telephone system, an incoming line, an outgoing line, means for connecting said incoming line to said outgoing line, a sequence switch for controlling the connection between said lines, a signal, a second sequence switch for controlling theoperation of said signal, means associated with an incoming line for operating said second sequence switch to associate said signal with said incoming line, means operated by the connectionh of said incoming line with said outgoing line for operating said second sequence switch toy disassociate said signal from said incoming line, and means operated by the last mentioned operation of said second sequence switch for operating said first kmentioned sequence switch.

6. In a telephone system, incoming lines, outgoing lines, an operators position in which said lines terminate, a signal at said position, a switching device forcontrolling the operation of said signal, means associated with an incoming line 'for operating said switching device to cause said signal to indicate the desired outgoing line, means under the control of the operator forY connecting the incoming line to the desired line, a circuit controlling device for controlling the connection between said lines, means operated by the connection of said incoming line with said outgoing line for operating said switching device for discontinuing the actuation of said signal, and means operated by the last mentioned operation of said switching device for operating said circuit controlling device to complete the connection between said lines. n*

7. In a telephone system, incoming lines and outgoing iines, means for connecting an incoming line to an outgoing line, e source of ringing current, a signal common to said incoming lines, means for associating said 10 signal Withy un incoming line, means operated by the connection of said incoming line with said outgoing line for disassociating said signal, nd means operated in disasseciating said signal for connecting said source of ringing current to said outgoing line.

In Witness whereof I hereunto subscribe my name this 4th. day of October, A. D.

ALBEN E. LUNDELL.

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