US1444781A - Telephone-exchange system - Google Patents

Description

Feb. E3, i923.

G. DEAKIN.

TELEPHONE, EXCHANGE SYSTEM 4' sheets-sheet l C+: vlllllllnunwl/ gera/d Dea/47H.

Feb. 13, 1923. v y

' G. DEAKIN TELEPHONE 'EXCHANGE SYSTEM l 4 sheets-sheet 2 Feb. a3', 1923. l 1,444,781 G. DEAKIN TELEPHONE EXCHANGE SYS TEM Filed May 2e, 1919 4" sheets-sheet B' //7 Ve/v fof. Gera/a Bea/w77.

G. DEAKIN TELEPHONE EXCHANGE SYSTEM 'eb. 13,.I 1921i F led May 26,

1919 4 sheets-sheet 4 Patented Feb. 13, 1923.

MNH TATS GERALD DEAKIN, OF LONDON, ENGLAND, ASSIGNOR 'EO-WESTERN ELECTRIOCOMPANY,

INCORPORATED, OF NEW YORK, N. Y., AOOBBORATION OF NEW YORK.

TELEPHONE-EXCHANGE srs'rnia.l

Application led May 26,

a meter associated with t-he callingline, in

the case of a successful call, in order to charge the calling subscriber with the service rendered. i

The present invention has for one of its objects the provision of an arrangement by which the charge recorded by the meter is automatically varied in accordance with the character of the'call, for instance, the distance of the called subscriber from the calling subscriber, This object is accomplished in the specificembodiment shown by dividing the subscribers lines into zones, and distinguishing the subscribers lines in different zones by one of the digits of theirdesignations or calling numbers, this digit being the same for lines in the same zone out dill'erent for lines in different zones. The actionvof dialing or otherwise transmitting the number of a wanted line initiates a series of operations, which besides effecting the extension of a call toward the wantedl line, also effects the variable operation of mechanism for control? ling the metering device in accordance with the zone of the called subscriber. A specificeature ofthe invention involves the use of la timing sequence switch or other device whose operation is varied in accordance with the setting of a register in recording the zone-distinguishing digit of the designation of the called line.

`Other objects and features of the invention will be apparent from the following detailed description considered in connection with the accompanying drawings, in which- I Figs. l to 6 represent4 diagrammatically portions of a. full automatic exchange ystem embodying the present invention; ig. 2 should be placed below Fig.v 1; Fig. 3 to the right of Fig. 2; and Fig. 4 to the right of '1919. Serial No. 299,962.

Fig.V 1; Figs. 5 and 6 show alternativearrangements comprising operators cord circuits accessible over the brushes at the right of Fig. 4. I

The sequence switch contacts to the left of the vertical broken line in Fig. 1 are part of timing sequence switch 100; those to the right' of this line apart of the connection lcircult sequence switch 130; those on Fig. 2v

a part of register sequence switch 230; those on Fig. 3 above the horizontal dotted line are parts of register sequence' switch 350; thel contacts enclosed in the broken line rectangles in the lower half of Fig. 3 are parts respectively of the registers, enclosed in the same rectangles, i. e., 300, 310, 320, 330 and 340-.

The operation of the exchange system illustrated, from a description of which the invention will befbest understood, is as follows:

The extension of a calling line over a first line finder takes place in the manner described in copending application Serial No. 268,649 iled December .28, 1918, in the name of Lipa Polinkowsky, for improvements in. machine switching telephone exchange systems. The common starting relay 16 having been energized, as therein set forth, a circuit is closed from ground over the front contact of relay 16, contact 103 of sequence switch 100, and co-ntact 134 bottomof sequence switch 130, for the energization` of relay 136 of the cord. The power magnet 125 of leach second line finder lcontrolled by the relay 136 is energized in a circuit over the front contact of relay 136 and sequence switch contacts 142 top and 139 bottom, and the brush carriages ot the second line finders rot-ate. `When the terminal 112 is reached by the test brush of one of the second line finders, its test relays 147 and '141 are energized in a circuit including sequence switch contact 148 top, terminal 112 is made busy, and sequence switch 130 moves from position l to position 4. Relay 136 is released as seque-nce switch contact 134 bottom opens in position 2 and relays147 and 141 release as sequence switch contact 148 top opens in position 4.

In positions 2 to 4 of sequence switch 130 a circuit is established front?- ground, relay operates and in turn operates relays 160,e

161 vand 164. Marginal f ,relay 143 does ythe energization of release relay 158.

not operate under these conditions. Relay 160 at its front contacts connects a p. speech transmission circuit including retardation coil 166 and relay 162 to the calling line. rlhe subscriber having his receiver off the hook, relay 162 is energized and preveits efore connection has been made to a register, the subscriber may hang up and release the connection by causing the deenergization of relay 162 and the consequentl energization of release relay 158.

While sequence switch 130 is passing position 3 and is in position 4, the common starting circuit for the registers, 2 and 3, is closed from ground, right-hand back contact of relay 158, sequence switch Contact 146 bottom, back Contact of relay 143, relay 205 and contact 239 of each idleregister circuit register sequence switch 230. At the same time atest potential is placed on the terminals 218 of the register in finders 201. Each connection circuit is wired to aset of contacts on two associated finders, an in, finder 201 and an out finder 202. A group of registers have, there-fore, access to all connection circuits -which may be connected to their arc terminals. rlhe energization of the starting relay 205 closes at its left-hand contact a circuit over sequence switch contact 262 bottom and back contact of relay 213 for the energization of' power magnet 210 and the brush carriage of the in finder 201 searches for the termi-,

nals of the connection circuit. `When the connect-ion terminals are found al circuit is established from battery, relay 143, sequence switch Contact 144 bottom, terminal 218, high resistance winding of relay 215 and sequence switch contact 264 ot sequence switch 230 to ground. Test relay 215 operates andmakes the connection circuit busy to all other register circuits by shunting itsv high resist-ance winding by its low resistance winding over its front contact to interrupter 212. When the brushes center themselves, the ground at the interrupter is removed and test relay 213 is operated. At its back contact relay 213 opens the circuit of power magnet 210 and at its front Contact closes a circuit from ground, lefthand front contact of relay 205, sequence switch contact 262 for tlhe energization of holding magnet 211 and in parallel therewith closes a circuit over sequence switch Contact 236 bottom for register sequence switch 230 which advances to position 4. When sequence-switch 230 is passing positions 2 and 3 and is in position 4, relay 253 is energized ina circuit from righthand back contact of relay 247 and over sequence switch 'cont-act 251 left. Relay 253 connects the stepping relay 243 to the connection circuit by way of the brushes 216 and 217.

Maasai At the same time the register test relays ground, sequence switch contact 246, lefthand armature and back contact of' relay 247, brush 218, sequence switch contact 144 bottom and winding of relay 143 to battery. Relays 213, 215 and 150 release. Marginal relay 143 operates and opens the common register starting circuit thereby causing the remaining connection' circuits to cease hunting. The deenergization of relay 150 releases relays 160, 161 and-164. Relay 160 at its back contacts connects the calling line with the register terminals 216 and 217, thus closing the circuit of the stepping in relay 243. When the sequence switch 230 reaches position 4, relay 253 having been energized as explained, relay 243 is energized in a circuit from ground, one winding of relay 243, one winding of dialing tone coil 248, outer front contact of relay 253, brush 216, sequence switch contact 106 of sequence switch 100, upper back contact of relay 160, brush 152 of the second line finder and thence through the telephone circuit and dial contacts over the other side of' the line to brush 153 4of the second line finder, lower back contact otrelay 160, brush 217, inner front contact of relay 253, other winding of dialing tone coil 248, other winding of relay 243 to battery. As soon as the in finder 201 moves, the corresponding out finder 202 automatically follows. The circuit oi power magnet 220 is closed from ground, right-hand front contact of relay 205, back contact of relay 225, the second'winding of relay 205, power magnet 220 to battery. When the brushes of finder 202 comel in contact with the. 'terminals 226 to 229, corresponding to the terminals 216 to 219, selected by finder 201, a circuit #is established from "battery, over terminal 219, terminal 229 to ground at interrupter 222. 1When the brushes of rfinder 202 center themselves this ground is removed and the circuit continues to ground through relay 225 and the right-hand front Contact of relay 205. Relay 225 operates and causes the energization of holding magnet 221 and the deenergization of power magnet 220 and of relay 205. Under normal conditions the finders 201 and 202 will always come to rest on corresponding terminals. Should, however, one of these finders be moved by hand or otherwise, while idle, it is possible that the finder 201 may select the connection circuit some time in advance of the finder 202, in which case, sequence switch 230 may be stepped out of position 2 and the common starting circuit for the register be opened at sequence switch contact 239. Relay 205, remains energized however, by virtue of its second winding until the finder 202 reaches the proper terminals. Should the :finder 201 be in contactvz with the terminals ofthe connection circuit at the moment the common starting circuit is closed, the terminals will be immediately seized and made busy by the energization of its test relays 215 and 213. This condition will often be met with.

When sequence switch 130 of the connection circuit reaches position 4, the cornbined timed metering and monitoring sequence switch 100 is energized in a circuit from ground, back contact of relay 163, contact 1,49 bottom of sequence switch 130 and contact 108 top of 'sequence switch 100. Sequencey switch -100 advances to position 6 and then to position 7 by means of a circuit from ground, Contact 145 top of sequence switch 130 and contact 107 bottom of sequence switch 100.

Premature release.

terrupter 114 alternately closes and opens for equal periods, a circuitfrom ground, terrupter 114, Contact 135 bottoni of sequence switch 130, timing sequence switch contact 104 and relay 136 to battery. uWhen the interrupter 114 closes, relay 136 energizes and closes a circuit at contact 102 top, for moving sequence switch 100 into position 8. When interrupter 114 opens this circuit, relay 136 is released and at its back contact closes a circuit over contact 102 bottom of sequence switch 100 for the energization of sequence switch 100 which advances to position 9. This cycleof operations continues until sequence switch 100 reaches' position 12, from which position it advances to position 13 by means of a cir-` cuit rorn ground, contact 145 top of sequence switch 130 and contact 107 bottom of sequence switch 100. From this point sequence switch 100 continues under the control o'f interrupter 114 as above described until it has advanced into position 17.

The exact time required to step sequence switch 100 from position 7 to position 17, will, of course, depend upon the position of interrupter 114 at lthe moment when the circuit of relay 136 is closed at contact 135 bottom.

-When sequence switch 100 reaches position 17 the circuit of stepping relay 243 is opened at contact 106 of sequence switch 100. Relay 243 deenergizes and causes the energization of relay 240 in positions 4, 6, L8, 11.and 13 of sequence switch 230. The

energization of relay 240-causes the energization of relay 237. In each of these positions a circuit is established from ground, front contact of relay 237, sequence switch lcontact 236 and sequence switch 230 to batthe energization of sequence switch 230,

which moves into position 1. As sequence switch 230 leaves position 15, relay 253 is released.

In positions 5 and 6 of sequence switch 230, a circuit ises'tablished from ground, right-hand back contact of relay 247, sequence switch Contact 232 top and contact 353 top for the energization of sequence switch v350, which advances to position 3. In this position it is again energized in al circuit from ground, back contact of relay 373, sequence switch contact 374, contact 256 of sequence switch 230, one winding and back contact of relay 378, (also in parallel through the other winding ot this relay) sequence lswitch contact 364, contact 342 top of register 340, and sequence switch contact 365,

and advances to position 4. 1n this positionsequence switch 35() is energized in a circuit including its Contact 353 and contact 232 of sequence switch 230, in, positions 7 to 13, and advances to position 5. ln position 5 of sequence switch 350 a circuit is established from battery to the winding of said sequence "switch, lower contact 365', contact 342 of register 340, lower contact 364, contact 334 of register 330, upper Contact 362, contact and armature and right-hand winding of relay 378, contact 256,-upper Contact 374 to ground at the armature and contact of relay 373. Sequence switch 350 advances from position 5 into position 7. A circuit is then established from ground,

vcontact 233 of sequence switch 230 and sequence switch contact 353 top of-sequence switch 350.; sequence switch 350 moves into position 9, in which iits'energizing circuit is closed as in position 3, except that instead of passing through sequence switch contact 364 top, etc., it passes through sequence switch contact 399, register contact 323 top, se-

quence switch contact 362, register contact 334, sequence switch contact 364 bottom, register Contact 342, and sequence switch contact 365. Sequence switch 350 goes to position 10 in which its circuit is closed over its contact 353 and contact 233 of sequence switch 230, or over its contact 365 to) and contact 233 ot' sequence switch 230. n position 11 ot sequence switch 350 its energizing circuit is closed over sequence switch lio contact 354, register contact 318, sequence switch contact 356 and thence over the back Contact and winding of relay 378, contact 256, uppergcontact 374, to ground at the armature of relay 373 or over contact 251 of sequence switch 230 and back contact of relay 247. ln position 12, the circuit is over sequencey switch contact 365 top and contact 233 of sequence switch .230; in. po-

y position 11.

l a circuit is momentarily closed from ground,

sequence switch contact 375, brush and terminal 228', and contact 137 of sequence switch 130, sequence switch 130 to battery. Sequence switch 130 moves into position 5, in which position the circuit ot relay 136 isopened at sequence switch contact 135 bottom. At the same time. sequence switch 100 is advanced to position 18, the energizing circuit extending from ground over sequence switch. contact 145 bottom. and sequence.

switch contact 108 bottom. In position 18 of sequence swich 100 the circuit of the monitoring lamp 119 is closed from ground, sequence switch contact 145 bottom, timing sequence switch contact- 109, holding key 115, lamp 119 to battery. Sequence switch 130 remains in position 5 and sequence switch 100 in position 18 until they are released by the subscriber or operator. l/Vhen the rigister circuit is released, a short-circuit around relay 150 through brush and terminal 218 is removed and relay 150 becomes reenergized in a circuit-trom ground, winding ot' relay 150, resistance 157, sequence switch contact 144 top, winding of marginal relay 143 to battery; relays 160, 161 and 164 are the-rotore also reenergized.

- Until the holding key 115 is thrown, the subscriber may release switches 100 and. 130 at any time by hanging up his receiver, thereby closing a circuit from ground, front Contact of relay 161, back contact of relay l 162, sequence switch Contact 159 top, release relay 158, holding key 115 to battery. Re-

lease relay 158 is energizedand locks up over its left-hand front contact and sequence switch Contact 155 bottom, and freeing the calling subscribers line by Aopening at its lett-hand back contact the circuit of the wire to terminal 154. At its right-hand front contact relay 158 closes an energizing circuit over sequence contact 132 top for sequence switch 130 which is returned to normal. Sequence switch 130 passespositions 8 and 16 since relay 141 is energized in these positions over the ho-me contact of interrupter 156, sequence switch contact 138 and magnet 171 to battery; the circuit for sequence switch 130 is closed in these. positions from ground, sequence switch contact 142 bottom, front contact of relay 141 `and sequence switch contact 140 top.

The operator upon noting the burning of monitoring lamp 119 may thro-w holding key l115. This transfers the circuit of the monitoring lampy to the back contact of the. calling supervisory relay 162 and opens the circuit ot the connectio-n circuit release relay 158, so that should the line become freethe lamp will again burn but the connection circuit will not be released. While the connection circuit-is thus held, the operator may plug into the monitoring ack 118 and apply the usual test to the line and when desirable may apply a howler. ln the case of a false call the operator will, lafter a predetermined period, turn the fault over to the wire chief for attention. lt will be noted that if the circuit isI not in its normal condition, either the monitoring lamp will burn or else the holding key 115 must be in an off norm-al and conspicuous position; either one of these conditions indicates a fault.

Local call.

The capacity of the exchange is assumed to be 100,000, the designation of each subscribers linecontaining tive. digits, and five registers being employed; one for each digit of a designation. rlhe subscribers lines accessible over switches controlled by the registers at an exchange are divided into three zones. Subscribers in the first zone e. g., those which may be reached without going through another exchange are designated by numbers, the first or ten thousands digit ot which is 1, 2, 3, 4, 7, 8 or 9, those in the second zone are designated by numbers whose first digit is 5; and those in the third zone by numbers whose first digit is 6'.

' With register sequence switch 23() in position 4, a circuit is estab-lished from ground, over back contact of relay 237, front contact of relay 243, to differentially wound relay 241 and thence in one direction through the high resist-ance winding ot' relay 241 and retardation coil to battery, and in the other direction through the lowresistance winding and back Contact of relay 241, sequence switch contact 238 bottom, ten thousands register 340 to battery. itsV register 340 advances from position 0 to position 1 the dit'- ferential windings of relay 241 are unbalanced by the ground placed on the back con; tact of relay 241 at contact 341 of register 340. Relay 241 breaks its back contact and remains energized over its high resistance winding as long as relay 243 remains energized.

Let it be assumed that the first of the five digits of the designation of the wanted subscribers line is 4 which corres onds to a train of four openings in the line circuit at the dial, the last opening, as in the case of each digit, being relatively long. Uppn each short opening of the line circuit, relay 243 releases and in turn, releases relay 241. When the line circuit again closes following each short opening, relayg243 is reenergized and register 340 advances one step. When the long opening is reached relay 243 remains deenergized long enough to cause the energization of relay 240, by a circuit from ground, back contacts of relays 237 and 243, relay 240, and sequence switch contact 239 to battery. Relay 240, which is slon7 to energize, operates and closes an energizing circuit for relay 237, which locks up over itsl front contact and closes an energizing circuit over sequence switch contact 236 top for sequence switch 230; the latter advances to position 6, releasing relays 240 and 237 by opening ycontacts 239 and 236. By the time position 6 is reached the line circuit is again closed and relay 243 reenergized. In positions 6, 8, 11 and 13 of sequence switch 230, thousands register 330, hundreds register 320, tens register 310 and units register 300 are, lin like manner successively energized and advanced to positions l determined by the corresponding digits of the designation of the wanted line. When the dialing is completed, sequence switch 230 is advanced to position 16, being first energized in a circuit romground, front contact 4of relay 237 and sequence switch contact 236, and then ina'circuit over local contact 231. When sequence switch 230 leaves position 15, by means of acircuit closed over contact 244 and back contacts of relays 243 and 237, the circuit of relay 253 is opened at sequence switch contact 251 and this relay releases. To extend the call to the desired line, first, second and third group selectors and final selectors are provided. A irst selector is shown at the right ot' Fig. 1 and a second group selector for extending calls to lines terminating in the same exchange is shown in Fig. 4; a ysecond group selector as arranged t'or extending calls received in another exchange Iis shown in Fig. 5 of the drawings Jforming part of copending application Serial No. 263,649 above referred to, Figs. 6 and 7 of said drawings illustrating a third group selector and a final selector.

When sequence switch 230 has ,reache position 5 a circuit is closed from ground, right-hand back contact of relay 247, sequence switchcontact 232, and contact 353 of sequence switch 350 for the energization oi sequence switch 350 which advances from position 1 to position 3. In position 2 of switch 350, a circuit is lclosed from ground, sequence switch contact |375 top, terminal 228, contact 1.37 Iof sequence switch 13 0, for the energization of sequence switch 130, which moves from position 4 into position 5.

The timing sequence switch 100, having been advanced to position 7 as above described, is returned to position 1', the energizing circuit being first from ground, contact 145 of sequence switch 130, contact 108 ot' sequence switch 100, and sequence switch 100 to battery; then in position 18 of the latter sequence switch, from ground, righthand back contact of relay 150, contact 107 bottom ot' sequence switch 10.0, and sequence switch 100 to battery.

When sequence switch 350 reaches position 3, the funda'mentalcircuit is established from ground, sequence switch Contact 372 bottom, back contact of relay 370, relay 373, brush and terminal 227, contact 131 bottom of sequence switch 13() and relay 136 to battery. Relays 373 and 136 are operated; at its front lcontact relay 136 closes a circuit over contact 105 of sequence switch 100, and contact 140 bottom of sequence switch 130, for the energizati'on of sequence switch 130 which advances to position 6. In this position a circuitis closed from ground, front Contact of relay 136, sequence switch contact 132 and trip spindle magnet 190 to battery. As the trip spindle rotates, it short-circuits at the top contact of its interrupter, the winding of rela 373 once for each position reached. Each time relay 373 is short-'circuited a circuit is established from ground, back contact of relay 37 3, sequence switch Contact 374 top, lcontact 256 of sequence switch 230, to differentially Wound relay 378, and from there in one direction through one winding ot' relay 378, to battery, and in the other direction through the other winding and back contact of relay 378, sequence switch conwinding it passes over register contact 342,`v

top contact. 365 bottom of sequence switch 350, and to battery through relay 370 and sequence switch 350 in multiple. The fundamental circuit is opened at the back contact of relay 370 and sequence switch 350 goes to position 4. Vhen the trip spindle completes the step through which it is passing, and ground at the top contact .of its interrupter is removed, relay 136 releases since its al ternate circuit is openat the back of relay 370. A circuit is established from ground, back of relay 136, and sequence switch contact 137 top, for the energization of sequence switch 130, which advances to position 7. The trip spindle comes to rest since its energizing circuit .is opened at the front contact of relay 136.

In position 7 of sequence switch 130, the energizing circuit for the brush carriage power magnet 170 is established from ground, over sequence switch contact 142 bottom, back contact of relay 141 and sequence switch contact. 139, and the brush carriage searches forv an idle trunk line to a second group selector in the well known manner. When an idle trunk is found a circuit is established from battery, (Fig. 4) contact 425 of sequence switch 420, terminal and brush 181, contact 148 of sequence switch 130, high resistance winding of test relay 147, sequence switch contact 146, and righthand back contact of relay 158 to ground.

`Relay 147 operates and causes the energization of test relay 141, thus bringing the brush carriage to rest in the well known manner, by deenergizing ythe power magnet- 170 and energizing holding magnet 171. A circuit is also established from ground, sequence switch contact 142, front contact of relay 141 and sequence switch contact 140 top, for the energization of sequence switch 130 which advances to position 9.

Sequence switch 350 remains in position 4 until after the thousands digit has been registered and sequence switch 230 has been advanced `to position 7. A circuit is then established from ground, right-hand back contact of relay 247, contact 232 of sequence switch 230 and contact. 353 of sequence switch 350 tor the energization of sequence switch 350 which advances to position 5. The fundamental circuit is established from ground, contact 427 of second group selector sequence switch 420, terminal and brush 182, upper backcontact of relay 164, terminal and brush 226, sequence switch contact 372 back contact of relay 370, relay 373, terminal and brush 227, sequence switch contact 131 top, lower back contact of relay 164, terminal and brush 183, sequence switch contact 426 bottom and relay 429 to battery. Relays 373 and 429 are energized. A circuit is established from ground. front contact ot relav 429 and sequence switch contact 422 top, for the energization of sequence switch 420, which advances to position 2. In this position` trip spindle power magnet 430 is energized in a circuit from ground over the front contact ot relay 429 and sequence switch contact 434. The trip spindle 43() and thousands register 330 are advanced together step-by-step, in the well known manner, until the register reaches its home position. Relay 370 is then energized, in a circuit over sequence switch contact 365 bottom, contact 342 top of register 340, sequence switch contact 364 bottom, contact 334 top of vregister 330, sequence switch contact 362 top, back contact of relay 378, contact 256 of sequence switch 230, sequence switch contact 374 top and back contact of relay 373 to ground; sequence switch 350 is energized in a circuit in parallel with relay 37 0 and advarices 1to position 7. The fundamental circuit is opened at the back contact of relay 370, and relay 429 is released, establishing over its back contact a vcircuit -for sequence switch 420 which advances to position 3. ln

this position the brush carriage power magnet. 440 is energized and the second selector searches for an idle line to the third selector, in the usual manner. ln a similar manner, as described more fully in the abovereferred to application Serial No. 268,649', the hundreds register 320 is returned to normal in connection with the third group selector with sequence switch 350 in position9, and the tens register 3 10- and the units register 300 are returned to normal in connection with the final selector, sequence switch 350 being in positions 11 and 14 respectively.

Since register 340 is not in its normal position when sequence switch 350 passes position 2, the circuit of relay 369.is open and this relay remains unenergized; therefore 4when sequence switch 350 passes position 5 after the operation of the thousands register 330, a circuit is established from ground, contact 363 top of sequence switch 350, left-hand back Contact of relay 369, sequence switch contact 375, brush and terminal 228, contact 137 of sequence switch 130, and sequence switch 130 to battery. Sequence switch 130 goes to position 11, in which it remains. After the selection is complete, sequence switch 350 of the register is energlzed in a circuit from' ground, (Fig. 2) right-hand back contact yof relay 247, contact 251 'or' sequence switch 230, (which has advanced to position 16 as above described) contact 356 of sequence switch 350, Contact 302 top of units register 300, back contact of relay 355, contact 304 of register 300. contact 354 of sequence switch 350; sequence switch 35() advances to position 16, and a circuit is established from ground, righthand back contact of relay 247, sequence switch contact25l, sequence switch contact 399, contact 323 top of register 320, sequence switch contact 362 bottom, contact 334 top of register 330, sequence switch contact 364 bottom, Contact 342 top ot' register 340, sequence switch contact 365 bottom and sequence switch 350 to battery; sequence switch 350 advances to position 17 inwhich a similar circuit is established over vsequence switch contact 356, contact 318 top 350 which advances to position 18; in this position a similar circuit is established over the sequence switch contact 356, register contact 302 top, back contact of relay 355, register contact 304 and sequence switch contact 354. Sequence switch 350 moves into position 1, and a circuit is established from ground, lcontact 366 top of sequence switch 350, contact 236 top of sequence switch 230, and sequence Iswitch 230 to ground. Sequence switch 230 moves into position 1.

When sequence switch 230 leaves position 15, the short-circuitl of relay 150 at sequence switch contact 246 is removed, and relay 150, and consequently relays 160, 161 and 164 are again energized.

When the called party answers, relay 163 is energized in a circuit completed over the called subscribers line. A circuit is established from ground, front contact of relay 163, contact 151 bottom of sequence switch 130, timing sequence switch contact 107 top, timing sequence switch 100 to battery. Sequence switch 100 advances to position 6, and in passing through' positions 2 to 5 inclusive, establishes a circuit from the metering booster battery 120, timing sequence switchv contact 111 bottom, contact 155 top of sequence switch 130, left-hand back contact of relay 158, second line finder brush and terminal 154, corresponding first line finder brush, and cut-oit' relay 57 and serv ice meter 58 ofthe calling line, to the eX- change battery. The service meter records one count. The timing sequence switch 100 remains in position 6.

If lthe calling subscriber hangs up, relay 162 releasesanda circuit is established from ground, front contact of relay 161, back contact of relay 162, release relay 158, holding key y115 to battery. Relay 158 operates and establishes a circuit from ground over its right-hand front contact and Sequence switch contact 132 top for the energization of sequence switch 130 which advances into position 15, from which point the release of the connection proceeds in the well known manner.

Should, however, the called subscriber, but not the calling subscriber hang up, a circuit is established from ground, back contact of relay 163, sequence switch contact .149 top, timing sequence switchcontact 110 bottom and timing' sequence switch 100 to battery. Sequence switch 100 advances to position 7 and in this position comes under the control of interrupter 114 and is advanced to position 18, as in the case of a false call, described above.

Should the calling subscriber fail to hang ip before the expiration of the timed period, as determined by interrupter 114 and sequence switch 100, av circuit is established from `ground, back contact of relay 163, sequence switch contact 149 top, winding of circuit-relay 163 releases and starts timing 75 sequence switch 100 on its way to position 18. This sequence switch however does not pass position 12 since its energizing circuit, by way of lits contact 110 bottom, is open inthis position, relay 163 having been only momentarily released.

If the called subscribers line is found busy or if the called subscriber does not answer, relay 163 is not energized and when the calling subscriber abandons the call and restores his receiver to its hook, release relay 158 is energized and restores the connection `without metering. This arrangement also permits carriage call or other operators,` when 'I tandem trunking, to answer with a condenser circuit or other non-direct current circuit to obtain the required information from the calling subscriber and to extend the connection to the wanted line so as to permit metering to commence only when the called party answers.

' By omitting the connection between timing sequence switch springs 107 and 110, the circuit may be changed so as to prevent release when the called party hangs up' his re- 100 ceiver, that is, so as to place the release of the connection entirely under the control of .the calling subscriber.

to subscribers lines terminating in a distant exchange 1s described in the above referred to application Serial No. 268,649. .As stated above, the first or ten thousands digit 110 of such line, if it is in the second zone, isv assumed to be 5. When any number commencing with this digit is` dialed, the ten thousands register 340 is stepped to position 5, in the manner Ibefore set forth. As sequence switch 350 passes position 2, a circuit is established from ground, sequence switch lcontact 366, contact 345 of register 340, relay 367 to battery. Relay 367 locks up over its right hand front contact, and sequence switch contact 363 to ground.v As sequence switch 350 passes into position 5, when the trip spindle of the second group selector -has been set, sequence switch z is advanced to position 11 as in the case of 1225v top of sequence switch 130 and timing sequence switch contact 107 bottom for the energization of sequence switch'100, which advances to position 7. ln this position the timing sequence switch 100 comes under the control oir interruptor 113. This interrupter closes andI opens for equal periods the circuit rom ground for relay 136, and' timing sequence switch 100 is advanced to position 12 asin the case of a call to the first Zone.

In position 12 a circuit is established from ground, contact 145 top of sequence switch 130, timing sequence switch contact 107 bottom, timing sequence switch 100 to battery; sequence switch 100I advances to position 13, and then to position 17 under control ofthe interruptor 113. In position 18 the same circuit is closed as in position 12 and the timing sequence switch advances to position 1, and begins a new rotation. rlhe timing sequence switch continues to rotate as long as both the calling and called subscribers receivers are oliin their hooks, the calling subscribers meter being operated once for each rotation of the timing switch.

When the calling subscriber hangs up, release relay 158 is energized and eiiects the release of the connection, as before described. Timing sequence switch 100 is returned to normal regardless of its position, its energizing circuit in positions 7 to 17 inclusive, and 1 extending from ground, contact 145 of sequence switch 130, timing sequence switch contact 108 bottom, and timing sequence switch 100 to battery, and in posi tion 18 from ground, right-hand back contact of relay 150, timing sequence switch contact 107 bottoni and timing sequence switch 100 to battery.

Should the called subscriber,but. not the calling subscriber, i ang up, the connection will remain undisturbed until timing sequence switch 100 reaches position 13, in which position a circuit is established from ground, back contact of supervisory relay 163, sequence switch contact 149 topq timing sequence switch contact 110 top and release relay 153 to iatterv Relay 158 is operated. rllhe calling line when freed or, s another call, and if, in the prescribes-L tlnie, the calling circuit is not opened, by the calling subscriber hanging up, the false call will come to the attention of the operator, as previousl described intensi With the above arrangement the calling subscriber is not `further charged after the conversation is broken by either party, and the calling party may not tie up a long important junction after the called party has hung up.

As timing sequence switch 100 passes position 1695, a circuit is established including the secondary winding of the transformer 180, through condenser 191 and timing sequence. switch contact 117 to one side of the line, and through a condenser 192 and timing sequence switch contact 116 to the other side of the line, and a tone or buzz is momentarily applied to the line, indieating to the calling subscriber that another charge is about to be recorded. lt is obvious that the time interval may be increased by having the contacts 116 and 117 close in an earlier position, as 155-.

As previously stated, the numbers of subscribers lines in the third Zone are assumed to have 6 for their first digit. When this digit is dialled at the beginning of a number, ten thousands register 3110 is stepped into position 6 and when register sequence switch 350 passes-position 2, a circuit is established from ground, sequence switch contact 366, register contact 345, and relays 367 and 376 in multiple to battery. Relays 367 and 376 are energized and lock up over their right-hand front contacts. By the energization of relay 367, sequence switch 130 is advancedto position 13 as in the case of Zi call in the second zone As sequence switch 350 passes position 13, a circuit is established from ground, lefthand front contact of relay 376, sequence switch contact 388, brush and terminal 228, and sequence switch contact 137, for the energization of sequence switch 130 which advances to position 15 and remains in this position until the connection is'released.

When the called subscriber answers, supervisory relay 163 is energized and the timing sequence switch 100 is placed under he control o't interrupter 11a, the circuit being from ground, interrupter 114i, Contact 135 bottoni of sequence switch 130, tiro ng se qiience switch roi'itact 10%, and rel 136 to battery; at 'ti-ont and back contacts relay 136 clos 'timing sequence s` yii contact 102 top or bottom, :for the ener`4 switch 100. l

on of timing sequence 'with two cii 113 is shown te. ini'oui cirthe speed from position 4 to position 5.

in the third zone. The mode of release and so forth is the same as in the case of calls to the second zone.

There is thus provided an arrangement by which for a call in the first zone, one unit of charge is made for an unlimited period, while for a call in the second or third zones one unit of charge is made for each fixed limited period, this period being longer in the case of calls to the second zone.

Special call.

It is desirable that calls for special services, such as for the information operator, shall not be metered. In making such calls, thel calling subscriber dials a number beginning with 0, for iiistance 01. Register 340 advances to position 0 and register 330 to position 1. Register sequence switch 23() advances to position 8 and register sequence switch "50 to position 7, in the manner referred to above. As sequence switch 350 passes position 2, al circuit is established from ground, contact 366 of sequence switch 350, register contact 344 and relay 369 to battery. Relay 369 locks up over its lefthand front contact in series with sequence switch contact 363. As sequence switch 350 passes position 2, circuit is also established from ground, contact 375 of sequence switch 350, brush and terminal 228 and sequence switch contact 137 for the energization of sequence switch 130, which advances The first group selector (Fig. 1)'now selects they level corresponding to the digit O; after which the second group switch (Fig. 4) under control of register 330 selects the level corresponding to the digit 1. Sequence switch 130 during this selection advances to position 9, as in the case of a call to the first zone. In

vF ig. 5 the brushes 482, 483 412 of the second group selector are shown in operative relation to the. terminals of a trunk leading to the operators position. A suitable signal 505 at t-he special'I operators position, is operated to inform her of the call.

As sequence switch 350 passes position 6, a' circuit is established from ground, back contact of relay 373, sequence switch contact 374 bottom, right-hand front contact of relay 369, winding of relay 247 to battery. Relay 247 is energized and locks up over its right-hand front'contact and sequence switch contact 249 bottom. At the right-hand back contact of relay 247, and energizing circuit for relay 253 is opened; this relay releases and opens the energizing circuit of stepping relay 243, which also releases. The release ot relay 243 energizes relay 240 in positions 4. 6, 8, 11 and 13 land in these positions relay 24() effects energization or' relay 237, and sequence switch 230 advances to position 15, as previously described. In this position, a circuit is estab-lished from ground, back contacts of relays 237 and 243, sequence switch contact 244 and sequence switch .230 to battery. Sequence switch 23() advances to position 16 in which a circuit isestablished t'rom ground, sequence switch contact 233 left, contact 353 top of sequence ,switch 350, and sequence switch 350 to battery. Sequence switch 350 advances to positions 9, in which a circuit is established from ground, right-hand back contact of relay 247 (which has been released when its energizing circuit was opened at sequence switch contact 249 bottom as sequence switch 230 left position 15), sequence switch contact 251, contact 399 of sequence switch 230, register contact 323 to-p, sequence switch contact 362 bottom, register contacts 334 bottom left, register 33() to battery. Register 33() is then returned to its normal position 0, after which the circuit from sequence switch 362 bottom continues by way of register contact 334` to sequence switch contact 364 bottom, and, as register 340 is held in vposition 0, by way of register contact 342 top, sequence switch contact 365 bottom and sequence switch 350 to battery. Sequence switch 350 advances to position 10, in which a circuit is established from ground, sequence switch contact 233, sequence switch contact 365 top and sequence switch 350 to battery. .Sequence switch 350 advances to position 11, from which it is driven by a circuit from ground, back contact of relay 373, sequence switch contact 374 top, sequence switch contact 256, winding and back contact of relay 378, se-

quence switch` contact 356, register contact sition 1 as described in connection with its release after the extension of a call to a subscrib'ers line in the zero zone.

The energization of relay 247, as above described, removes at its left-hand contact, the short circuit from relay 150, which latter relay, however, is energized in series with resistance 157, sequence switch contact 144, marginal relay 143 to battery. `The introduc. tion of the resistance 157 into the circuit of the test potential placed on the register terminals 218, prevents another selection of this connection circuit by another register should one happen to make contact with the inder arc terminals. By the energization of relay 150, a circuit is closed over its lefthand front contact and the right-hand back contact of release relay 158, for the ener-4 gization of relays 160, 161 and 164; the energization of these three relays extends the talking circuit from the'second line finder brushes 152 and 153 to the first group switch brushes 1/82 and 183, and also frees the talking circuit from connection with the register finder terminals.

` Should the special operators answering circuit include a closed circuit for direct current such as is shown in Fig. 5, relay 163 will be energized when the operator answers by inserting her plug 501 1n jack 502, thus short-circuiting the winding of the release relay 158 over the front contact of relay 163 and sequence switch contact 151 top. The calling. subscriber may signalthe operator and in so doing energizes supervisory relay 162 without fear of releasing the connection. The opening of a called line transmission circuit at the front Contact of relay 162, causes the deenergization of relay 503 in the operators circuit, and the circuit of lamp 504 is established over the sleeve contacts of jack 502 and plug 501, back contact of relay 503, lamp 504 to battery, and lamp 504 is illuminated. In this way the calling subscriber is placed under the full control of the answering operator.

Should the answering subscribers circuit include condensers such as sho-wn in Fig 6, supervisory relay 163 will not be energized and the calling subscriber may release at any time before, during or after the operators answer. The act of hanging up by the call,-

ing subscriber, releases supervisory relay 162 and thereby establishes a circuit from ground,

front contact of relay 161, backk contact of relay 162, sequence switch contact 159 top, release relay 158, holding key 115 to battery. Sequence switch 130 is energized in a circuit from ground, right-hand front Contact of relay 158 and sequence switch contact 132 top, and advances to position 16. ln this position the brush carriage is restored, circuit from ground', back contact of relay 141, sequence switch contact 139 bottom, brush carriage 170 to battery. Relay 141 is energized when the'home contact at interrupter 156 'is closed. Sequence switch 130 is energized. in a circuit from ground, sequence switch contact 142, front contact of relay 141, sequence switch contact 140 and sequence switch 130 t0 battery and returns to position 1. The trip spindle is also returned to normal, circuit from ground, trip spindle interrupter, sequence switch contact 132, power magnet 190 to battery.

It is to be noted than on connections of this character the metering sequence switch is not brought into service.

It is important that'when two in7 linders 201 simultaneously make connection with the connection circuit, the connection circuit should notbe disturbed; that is, some other iinder should be able to select the connection circuit immediately afterward. In such case, relays 215 and 213 of both in finders are energized in position 1 of the associated sequence switches 230,

integer as described above. As each sequence switch 230 passes position 2, the high resistance winding of relay 215 is opened at sequence switch contact 264, whereupon relays 213 and 215 release, since the current flowing through the test relays at both finders is not suilicient to maintain their energizat-ion. In position 2 of sequence switch 230 a circuit is established from ground, sequence switch. contact 262, back contact of relay 213, sequence switch contact 249, winding of relay 247 to battery. Relay 247 locks up over its front contact in a circuit from ground, front contact of relay 247, sequence switch contact 249 winding of relay247 to battery. This .relay is sluggish in releasing so that it does not fall away during` 247 also removes the short-circuit to ground over brush and terminal 218, thereby preventing t-he deenergization of relay 150 of the'connection circuit. Relay 240 is energized over the back 4contact of relay 243 in positions 4, 6, 8, 11 and 13 of sequence switch 230, and therefore in these positions sequence switch 230 is energized over the front contact of relay 237 and advances to position 15. ln position 15 a circuit is estab-A lished from ground, contact 366 of sequence switch 350 in' position 1, contact 236 of sequence switch 230, sequence switch 230 to ground. Sequence switch 230 returns toposition 1. turbed.

What is rclaimed is:

1. In a telephone exchange system, selective switches for establishing talking connections, a register controlling mechanism, electrical means` for variably.- setting said mechanism, means controlled by said mechanism for operating said switches, a measuring device, and means dependent on Athe setting of the ycontrolling mechanism for variably operating said measuring device.

2. In a telephone exchange system, selective switches for establishing talking connections, a register controlling mechanism. electrical means for variably setting said mechanism to record the 'designations of wanted lines, means controlled by said mechanism for operating said switches, a message register', and means operative in accordance with the setting of the controlling mechanism for variably operating said message register.

3. In a telephone exchange system, a selective switch for establishing connections, a multi-position register, electrical means for variably setting said register in accordance with the designation of a wanted Sequence switch 350 is not disline, means controlled by said register for selectively operating said switch. a message register', and meansdependent on the setting of said multi-position register for varilll ably operating the message register.

4. ln a telephone exchange system, selective switches for establishing talking connections, a register mechanism, electrical means for variably setting said mechanism, means controlled by said mechanism for selectively operating said switches, a message register, means for successively operating the message register at different rates, and means dependent on the setting of said register' mechanism for determining the rate of operation of the message register.

5. ln a telephone exchange system, selective switches for establishing talking connections, a register mechanism, electrical means 'for variably setting said mechanism in ,accordance with the `designations of called lines, means controlled by said mechanism for selectively operating said switches, a message register, means for successively operating the message register at different rates, and means controlled by said register mechanism in accordance with the designations of a. called line for determining the rate of operation of the message register.

6. ln a telephone exchange system, a calling lin-e, called lines,'selective switches Jfor extending the calling line to said called lines, a register controlling mechanism, electrical means for variably setting said mechanism, means controlled in accordance with the setting of said mechanism for selectively operating said switches, a n essage register for the calling line, and means dependent on the setting of said controlling mechanism for variably operating the message register.

7. ln a telephone exchange system., a calling line, a plurality of called lines of different classes, selective switches for extending the calling line to said called lines, a register controlling mechanism, electrical means for variably setting said mechanism, means controlled in accordance with the setting ot said mechanism for selectively operating said switches, a message register, and means controlled by said mechanism in accordance with the class ot the called line for variably operating said message register.

8. ln av telephone exchange system, a calling line, a plurality of called lines located in different zones, selective switches for eX- tending the calling line to said called lines, a register controlling mechanism, electrical means for variably setting said mechanism, means controlled in accordance with the setting of said mechanism for selectively operating said switches` a message register', and means controlled by said mechanism in accordance with the zone in'which the called line is located for variably operating said message register.

9. In a telephone exchange system, selective switches for establishing telephone connections, a register controlling mechanism, electrical means for variably setting said mechanism, means controlled in accordance with the setting of said mechanism for selectively operating said switches, a message register, a timing device for successively operating the message register at predetermined intervals, and means controlled in accordance with the setting of the register` controlling mechanism for determining the length of said intervals.

10. In a telephone exchange system, selectiveswitches for establishing telephone connections,-a register controlling mechanism, electrical means for variably setting said mechanism, means controlled in accordance with the setting of said mechanism for selectively operating said switches, a message register, a plurality of timing devices each arranged to cause the successive operation of said message register at definite intervals, the length of the intervals being diHerent for each timing device, and means controlled in accordance with the setting ot the register controlling mechanism for selecting one of said timing devices.

l1. In a telephone exchange system, selective switches for establishing telephone connections, a register controlling mechanism, electrical means for variably setting said mechanism, means controlled in vaccordance with the setting ot said mechanism for selectively operating said switches, a message register, a timing switch arranged to be driven repeatedly through its cycle of operation, means 4controlled by the timing switchduring` each cycle of operation for operating the n'iessage registeigland means controlled in accordance with the register.

controlling mechanism for varying the length of time required tor the timing switch to complete its cycle.

l2. ln a 'telephone exchange system, a calling line, a plurality of called lines of different classes, selective switches for extending the calling line to said called lines, a.

register' controlling mechanism, electrical means for variably setting said mechanism,

means controlled in accordance with the setting of said mechanism for selectively operating said switches, a message register, a timing device for successively operating the message register at predetermined intervals', and means controlled by the register controlling mechanism in accordance with the class of the called line for determining the length of said intervals.

In witness whereof I hereunto subscribe my naine this 19th day of September, A. D.

GERALD BEAKIN.

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