US1724174A - To automatic electbic inc - Google Patents

Description

3, 1929. J. l. BELLAMY ET AL I I 1,724,174

' AUTOMATIC TELEPHONE SYSTEM Original Filed Aug. 24, 1925 8 Sheets-Sheet 1 Jnusn U175.

I. sZZamy g- 1929- w J. IIBELLAMY ET AL 1 ,724,174

AUTOMATIC TELEPHONE SYSTEM Original Filed Aug. 24, 1925 8 Sheets-Sheet 2 Jnhn lBEZZamq Bnu nay E.B1charn"sun g- 13, 1929- J. l. BELLAMY ET AL AUTOMATI C TELEPHONE $YSTEM Original Filed Aug. 24, 1925 8 Sheets-Sheet 3 s R s s 9 s g a 5 1:, v hsrdsun Bmfne E1311:

Aug. 13, 1929. J. I. BELLAMY ET AL AUTOMATIC TELEPHONE SYSTEM Original Filed Aug. 24, 1925 8 Sheets-Sheet 4 nlllllHlll 5 m RU KR \RNU fih QNWU wMAK MNNN) l'nusn 0:5

I can't-Lag John lBEUamy E.Hzcharcfsan Aug. 13, 1929. J. 1. BELLAMY ET AL 1,724,174

AUTOMATIC TELEPHONE SYSTEM Original Filed Aug. 24, 1925 8 Sheets-Sheet 5 U Eg LE. Hwharmsun Iuuan urs Jflm LBEZIE'LTL MEG Aug. 13, 1929. J. 1. BELLAMY ET AL I 1,724,174

AUTOMATI C TELEPHONE SYS TEM Original Filed Aug. 24, 1925 8 Sheets-Sheet 6 --Inusn :lrs Jul-m lBeZZamg I Buy E. Hz:hardsmn I m- Aug. 13, 1929. I J. I. BELLAMY ET AL 1,724,174

AUTOMATI C TELEPHONE SYSTEM Original Filed Aug.24, 1925 V 8 Sheets-Sheet 7 ITIUEfi U115 Jul-1n [Bellamy Ha nsigfim srusmn Aug. 13, 1929. J, BELLAMY ET AL 1,724,174

AUTOMATIC TELEPHONE SYSTEM Original Filed Aug. 24, 1925 8 Sheets-Sheet 8 Jim Jczhn lBEUaTm;

Ruins [4.131511521551211 Patented Aug. 13,1929.

"UNITED STATES i 1 1,724,174- PATENTOFFICE;

TOT-I111. BELLAMY, OF BROOKEIELD, AND RODNEY G. RICHARDSON, OF CHICAGO, ILLI- NOIS, ASSIGNQRS, BY Mill-ENE ASSIGNMENTS, TO AUTOMATIC ELECTRIC INC, 013 CHICAGO, ILLINOIS, A. CORPORATION OF DELAWARE.

AUTOMATIC TELEPHONE SYSTEM.

Application filed August 24., 1925, Serial No. 51,938. Renewed January 25, 1929.

The present invention relates to automatic telephone systems in general, but it is con cerned more particularly with sjstcms of this type in which directors are employed to properly route the calls.

Directors that are used tor routing calls to the proper ollices are ordinarily each pro vided with a separate distributing frame at which the connections are made to secure any desired routing oi the calls. As the various senders oi" the directors operate independentof each other, the above arrangeinentis the simplest from a circuit standpoint. however, a better arrangement is one in which the intermediate distributing frame is common to a pli'lrality oil? directors. Furthermore, this latter arrangement enables the routes over which certain calls are handled to be conveniently and quickly changed fromv time to time as the conditionsmay require. It is with the common intermediate distributing frame type of director that the present invention concerns itself.

One object oi this invention is to provide a director system in which a given ollice code digit is determined by one or more impulses transmitted over a single wiper of the otlicc register, thereby permitting the munber oi? wipers on the ollice register in a system of this type to be maintained equivalent to the maximum number o'l ol'lice code digits.

Inorder to carry out-and to attain the above object, each director has been provided with a tr nslating mechanism li'or controlling a registering device, coi'isisting of tour relays in the present case. This translating device may be operated in any one of a number of ditlerent ways (twelve in the present case) over each wiper 'ot the office register successively to set repeatedly the registering device in the director to control the transmission of the desired digits.

As one of the prime requisites of a system of this kind is that no unwarranted delay shall take place, the registering device is set quickly accordir 7 to a predetermined code rather than by ordinary non-coded impulses. This enables the relay register to be set quickly to start the transmission oi the first oflico code digit without undue delay andv it enables the register to be reset for each following digit di'lring the usual interval be- H v g l tween successive operations oi: the sender, ll?

being understoodthat the suecessive opera From the standpoint o'l? economy,

tions of the sender are spaced apart suiticiently to permit the change-over and trunk hunting operations of the automatic switches to take place.

Another object of the invention is the production of a suitable arrangement. whereby the oliice register, which is used only while the office digits are being registered and while the code digits are being 'reltrans mitte d', may be restored to the common use of the directors as soon as the last oliice code digit has been transmitted, instead of the usual. arrangement according to which an ofiice register is. an integral part of each director.

In order to carry out the aboveobject each director is provided with. an otlice register selector, which is operated. to select an i dlc oflice register when the director is taken for use and which is released to release the office register when the last office code digit is transmitted.

The other objects and features of the invention have to do for the most part with the circuit details involved in carrying out the foregoing, and they may he gathered best from the description which isto follow.

Referring now to the drawings-compris ing Figs. 1-9, Figs' 1-6 show by means of the usual circuit diagrams a certain amount of equipment in a. telephone system embodying the principles of theinvention; Figs. 7 and. 8 show two desirable inodificationsjand Fig. 9 is a table showing the code according to which the digits are transmitted from the common sending drum to the directors.

In order for the drawings to be understood best, Fig. .3 should be placed below Fig. 1, with Fig.2 to the left of Fig. 3; Figs.

and 6 should be placed below Figs. 2 and 3, respectively; and Fig. i should be placed to the lei't of Fig. 5. 1

7 Fig. 1 shows the trunk circuit TC inserted in" the associated trunk line between the bank contacts 2-%t oli'a line switch and the selector S. This drawing shows also the director selector DS individual to the trunk circuit TC. This director select-or has access to a number of directors, one of which is shown in 36.

The portion of the director shown in sequence switch S which places-the Icornrious reg men sending mechanism under the control of the various registers in the proper order.

The portion of the director shown in Fig. 3, comprises the sending switch SS which cooperates with the pick-up and stop relays 241 and 242 to transmit the impulses as predetermined by the setting of the registers. This drawing shows also the control and translating relays 231 239 and the release relay 2'40.

Fig.4, shows the o'liiceregister GR which :is common to a plurality of directors. T his drawing shows also the common sending dru1n301 which transmits impulses to the several directors. l lurthermore, this drawing shows the intorinedi-atc distributing ifranie .lDl lat which. the coiniections lFQtlWE-Etfil :the multiply connected hankcontacts oi? the oliice registers and the hr she." or the drum 301 are made asdesired.

Theq ortion of the direct r shown n l i 5 comprises the relay register consisting oi .the relays 419- 422 and the oliice register selector ORS, which selects an idle otiico register when the associated director is seized, and which .is released to free the oiiice register when the proper time arrive-.:.

The portion of the director shown in Fi comprises the digit registers DR1'DR- 4which register the tour subscriber digits in order to control the sending mechanism to subsequently retransmit them.

In order that the operation of the :apv mrai'zus may be understood best, the way in which a call is handled will now be exvplained.

Assuming that the trunk circuit TC, 1, ii seized-at the terminals 2-4 by a ing line switch, line relay '8 which nected through arinaturcs 1.6.and 1S and their restingcontacts to conductors 5 and 7 pulls up over the calling line and closes at armature 1.]. a circuit for release relay 9. Release relay 9.energi1 .es and grcuiuls lhe release trunk conductor 0 armature 18. irtarmature a circuit is closed for relay 1.9 of the director selector ES and the stepping magnet in series, andat ariua true .15 .the test wiper 27 of the director selector D8, which is connected through armature-23 and its resting contact .to the working contact of arm: ure 1:), is connected'tothe junction of relay l9 and step ping magnet- 20. Accordingly.. step' 'iing zmagnet-20 operates in a buzzer like manner to advance the wipers 28 in case the director associated with. the bank contacts on which the wipers are standing Iousy. In this case relay 19 is short circuited by the ground potential pickednp by test wiper 27 to drive the magnet 20 and does not eneu gize. hen an idle director is reached, for example the one shown. in the drawing, th operation 01 stepping magnet 20 ceases relay 19, being no longer short circuitcd,

Fig. callconand 218;

energizes in series with stepping magnet 20. Stepping magnet 20 does not energize at this time owing to the relatii 'ely high. re sistance of :relay .15). Relay lflat armature 24 prepares the operating circuit; at armature 23 itopensthe test circuit and grounds test wiper 27; and at armatures 21 and 22 it connects the conductors 5 and 7 of the selector S to the \i'ipers 25 and 20, with the result that relay 41 of the selector S energizes over conductors 20 and. or the seized director and through the sending con tacts 2.43 in multiple with the aerating con-- tact and armature 286. Relay 41 of the selector S at armature 51 closes a circuit tor the release relay 42 which energizes antiperpares the switch for operation in the usual In the seized. director, when the release trunk conductor 31 is grounded thr ugh the test wiper oi the director selector DS, release relay 240 energizes. At armatiurcs 280, 281, and relay 240 removes ground from the release conductors 204, 205,206, at armature 284 it places ground on too locking conductor 217; and at armature 285 it prepares a circuit for pick-up relay 232. As a "further result of its energization, relay 240 at armature 279 closes a circuit through armature 202 and its resting contact and conductor 203, extending across Figs. 2 and 5, tor relay 402017 the office register selector OBS and stepping magnet 401 in series. At the same time, relay 240 at armature 278 connects test wiper 400 of the oilice register selector OBS, Fig. 5, to the junction of relay 402 and stepping magnet i through armature 414 of relay 402 and its resting contact, conductor 201, armature 27S and its working contact, armature 201 and its resting contact, and conductor 20:2.

'ltelay 402' energizes in case the o'iiice register on which the wipers 4034l0 are standing is idle,but it is short circuited and prevented from energizing in case this o'liice register is busy, in which case the wipers of the oi'iice register selector OBS are advanced step by step in the usual manner by the self interrupting stepping magnet 40]., which operates troni the ground picked up by the test wiper 406.

Vihen an idle oi'fice register is reached, for example the oiiice register OR, Fig. 4, test wiper 40-6 encounters an ungrounded test contact, whereupon the operation of magnet r 401 ceases. When this occurs relay 402, being no longer short circuited, energizes in series with stepping magnet 40]., stepping magnet 401 not energizing at this time on account of the relatively high resistance of re lay 402. Upon energizing, relay 402 disconnects test wiper 406 from the junction of its own winding and that of magnet 401 and connects it to the grounded conductor 203, therehy placing a ground potential through til) the test wiper 206 on the test conductor 35 1 of the otiice register OR; connects up the wipers 4107-4-10 at armatures 1-15t18. The connecting up of wiper t03at armature 411 results in the extension of the operating circuit to the vertical magnet 343 of the otfice register OR; Accordingly, the calling subscriber hears the dial tone which is placed on the vertical'magnet circuit of the oflice register OR by the dial-tone transformer 307 which is common to a plurality of the otlice registers. The tone current generatedin the left hand winding of the transformer 307 asscs through the vertical magnet 343, conductor 351, bank contact and Wiper 403, armature 411 and its working contact, conduct-or 121, bank contact and wiper 109, relay 101, conductor 32, bank contact and wiper 28, armature 24- and its working contact, and condenser to the lower heavy talking conductor 7 through the resting contact and armature 18.

When the calling subscriber hears the 8 :ialls back a number of times corresponding to such digit. Each time it falls back it closes at the resting contact and armature 12 a circuit for the vertical magnet 3 13, Fig. l, through the working contact and armature 24, wiper 28 and the bank contact on which it is standing, conductor32, series relay 101, wiper 109 of the sequence switch S, conductor 121, working contact and armature 111, wiper 4103 and the bank contact on which it is standing, conductor 351, and vertical magnet 343 to battery through the letthand winding of the transformer 307; By the operation 01? vertical magnet 3413, the wipers 3393 l2 are raised step by step until they stand opposite the desired level of bank contacts. Relay 101, Fig. 2, is energized in series with the vertical magnet on the first impulse of currentdelivered. to the latter, and, being slow acting, maintains its armature attracted throughout the series of im pulses. At armature 103 relay 101 closes a circuit for relay 102 which energizes and prepares at armature 10 1 a circuit-for the stepping magnet 105 of thesequence switch 0.

At the end 01 the series of impulses, relay 101 falls back and completes the stepping magnet circuit at armature 103, yvhereupon n'iagnet 105 advances the wipers 108 and 109 one step. Wiper 109 disconnects the impulse conductor from. conductor 121 and coni'iects it to conductor 122. .After an interval relay 102 falls back and opens the circuit of relay 105 at armature 104.

iVhen the next digit is dialled, the impulses oi current are delivered over conductor 122 and through thewvorking contact and armature 112, wiper 410 1, the bank contact on which it is standing, and coir ductor 352 to the rotary inagi'ietiitd oi" the other: register OR. t By the operation ot'rotary magnet 3414;, the wipers33934i-.2 are rotated step by step until they -conic into engagement with the desired of bank contacts, for example the set comprising contacts 331 33a, representing the exchange 111 which thecalled line terminates.

Relay 101 is again energized and cooperates with rclay 102 to operate magnet 1.05

to again ad *ance the wipers 108 and 109 that the retmnsmission.is started in a man-.

nor to be pointed out subsequently.

"Vhcn the next digit is dialled, magnet 001 of the digit register 1)R1 is operated over conductor 123 to set the associated viper on the bank contact corresponding to the digit dialled.

Similarly, the digit register Dlt-2 responds and records the second sul'iscribed digit; the digit register DR-3- responds and records the third subscriber digit; and the di t register DEE- 1 responds and records the fourth subscriber digit The W13G1'S 108 and 109 of the sequence switch S are'of course advanced one step following each 01 the (llf ts withv the rcsnit that wiper 109 is advanced to adead contact" following the last digit. The wipers remain in this posi tion untii the director released.

Returning new to the point at which the start conductor 208 grounded, soon (after this occurs) as the common sending drum 301, Fig. i, arrives in the pick-up position shown in the drawing, ground through the brush is placed on the pick-up brush 304i and is extendedtothe pick-up relay 232, Fig. 3, over the common pick-up conductor 210through armature 252 and its resting contact, the resting contact and miniature 290, arn'iature 2555 and its working contact, resting contact and armature 275, and armature 2 3 and its restiiig contactto the pick-up relay 232. Since the other terminal oi relay 232 is connected to battery through start comilitictor 208, relay 232 energizes and locks itself at armature 265 through relay'238, and the resting contact and armature 277 to the grounded locking conductor 217. Relay 238, which is included in'this locking circuit, does not en ergize at this time, however, on account of e the fact that it is short circuited by the ground potential applied to the initial circuit o1 relay232. As a further result of its energization, relay 232 closes at armature 267 a circuit through the resistances 237 and 230 in series as to place a derived neutral potential on the right-hand terminal. oi the polarized relay at armature 260 it ccn-- ects the left-hunt terminal of the polarized relay 235 through the reading contact and arn'uiture 20 i and conductor 20) to the dire trilniting wiper 113 of the sequence switch S; and arnmtures 208 and 209 connects up the switching conductors 21s and 215 to the corresponding relays 232-3 and 234:.

A moment later the further rotation of the drum 801 brings the first vertical insulated strip under the brushes, removing gri'iund from the pick-up brush 304. lVhen this occurs the lockin circuit of pick-up relay 232, 8, becomes ellcctive because the initial circuit is broken and relay 238, which isincluded in this locking circuit, energizes and opens at armature 273 a further point in the initial circuit of relay and prepares a circuit for stop relay 239.

As the drum 301 rotates further, the vririous brushes are connected to battery or ground or l") potentials according to the table shown in Fig 9. in this case it is assumed that the wipers of the office register GR are set on the bank contacts 331-334. lt will he noted that the first hank contact 331 is cross connected on the intermediate distributing trains llll? to the brush 319 corresponding to the digit 9. referring to the table shown in l i 9, he noted that the digit 9 r single positive impulse delivered in the second positive-impulse position.

Considering now the rotation of the drum in detail, after it has gone through the pickup position, the drum goes through the first positive position without producing any result that nil'ects the present cull. The first positive position corresponds to the A relay 4:19, Fig. 5 and the positive contact of the polarized relzr 2353 is normally connected through arn'izrture 27 and its resting contact and conductor 210 to the right-hand winding of the A relay 410. In this case however the A relay not to be operated, and accordingly, no posithxe impulse is transmitted to relay 235, in the first positive position of the drum.

hen the first negative position of the drum is reached, which position corrcsgonds to the B relay 420, Fig. 5, the switching hrush 302 of the drum 301 encounters a ground potential which is transmitted over conductor 21% and through armature 268' and its working contact to the positive s.'-.'itching relay which disconnects the p sitive contact of the polarized reaiy 235 from the A relay 419 and connects it by way of conductor 21? to the C relay 421. The first negative position of tie druin corresponds to the B relay 420, Fig. 5, to which the negative contact of: relay 235 is normally connected through. armature 2'21,

and resting contact and conductor 211. Relziy 420 does not operate because brusn 31.9 does not encounter any potential source in the first negative p sition.

l lhcn the drum 301 arrives in its second positive position, ground (I- huttery) is placed on brush 319 and is extended-over the jumper 323 through hank contact 331, wiper 339, conductor 355, bank CODtiLCt and wiper 42:07, armature 41:15 and its working contact, comluctor 127, contact and wiper 1123, condutor 209, armature 26 i and its resting conlechornmture 206 and its working contact, and "clay 235 to the junction of resistances 2 (i'and 237, which represents a neutral point oi. the exchange l'mttcry. Accordingly, relay 235 operates to piece ground on its positive cents: therclry closing a circuit through mine-cure 270 and its working contact, and over conductor 212 for the right-hand winding of relay 421. Relay 421 energizes and locks its loft-hand winding to the locking conductor 217, at the same time shifting its right-hand erumtures to efl'ect the necessary circuit changes. I

As a further result of the arrival of the drunr 301 in its second positive position, ground placed onthe negative switching wiper 30 -3 and extended over conductor 1 and through armature 269 and its working contact to the negative s\\"itching relay l'lelsy 23 tl'iere'lfore energizes and disconnects the negative Contact of the polarized relay 235 from the B relay 4-20 and connects it instead through conductor 213 to the D relay 4-22 preparatory to the arrival of the drum 201 in its second negative position.

lVhen the drum 301 leaves the second posivc position and goes into the second negovo position, the grounil removed from ti ti wiper 310, "whereupon the polarized relay 235, l 3, assi'unes the normal position shown in the drmving. opening the circuit of the right-hand winding of relay 421, but relay 4-21 reuuiins energised through its locking circuit which includes its left-hand winding. It will he noted that no circuit is closed over wiper 3.19 in the second negative position of the sending druiu 801.

The drum 301 continues to rotate with the result that the piclcup position is reached the second time and the pick-up wiper 30 i; is again ounded. lVhcn this occurs, a second impulse transmitted over the pick-up conductor 210 which at this time passes through armature 252 and resting contact and the working contact and armature 200, armature 285 and wrn'liing contact, resting contact and arnmture 275, armature 213 and its working contact, and the normally closed contacts controlled by armature 276 to relay 239. live-lay 239 energiaes and locks itself to conductor 217 at armature 2T6, opens its initial circuit armature 275 so as to pre vent the circuit the picleup relie from being again closed until the proper time arrives; and at armature 277 opens the loclc ing circuit of pick-up relay 232. When this occurs relays 238 and 232 fall back, and relay 238 prepares acircuit for pick-up relay 232. Relay 232 restores the associated circuits to the normal position shown in the drawing. e

As at 1111111161 result of the energization of the stop relay 2238, at armature 274 it connects the interrupter 115 (which is connected to the working contact of armature 274 through armature 117 and resting contact, and conductor 118) through the resting contact and arn'iature 292 to the stepping n'iagnet 245 of the sending switch SS. 7 Stepping magnet 245 now energizes and deener- .cs under the control of the interrupter 115. Upon its first energization, magnet 245 moves the associated pawl into engagement with the next notch in the. wiper-driving ratchetwheel but does-not move the associated wipers, and. at the contacts 243 opens a point in the outgoing control circuit including conductors 29 and 30, leaving the oi'ite'oing control circuit closed through the resting contact and armature 286 of the pickup relay 241.

Upon the following deenergization of magnet 245 the wipers 246 and 247 are advanccd one step. tViper 247 engagi-isadead contact but wiper 246 engages a grounded contact with the result that pick-up .relay 241 energizes. At armature 286 relay 241 opens the associated point in the outgoing control circuit, leaving the outgoing control. circuit now closed. only atthe sending contacts 243; it places an additional ground on the release trunk conductor 81 at armature 287 so as to hold release relay 24.1 energized until the sender again reaches its normal position in case the calling subscriber hangs up his receiver prematurely; and at armature 288 it closes a circuit for the magnet of the sequence switch S through armature 293 and its resting contact and over conductor 207. Magnet! energizes preparatory to advancing the wipers 112 and 1.13.

Upon the next energization of magnet 245 the outgoing control circuit is opened. at contacts 24?), armatiu'e286 having been. op-

erated as above stated. The control circuit is again closed at contacts 243 when magnet flifi talls back. The wipers areadvanced another step and wiper 247 at this time engages the first impulse stop conductor, but,

' control circuit at the sendingcontacts 243.

The ninth inte ru'ption is produced with the wiper 247 standing on the bank contact assosluce this stop conductor is not grounded at this time. this operation does not result ciated wit-lithe eighth impulse stop conductor. Then magnet 245 falls back and terminates the ninth interruption in the outgoing control circuit and advances the wipers 246 and 247 another step, wiper 247 engages the bank contact in which the ninth impulse stop conductor terminates, thereby closing a circuit for stop'relay 242 as t01-, lows: From ground by way of the right hand armature and resting contact'of relay 419 Fig. 5, right-hand armature and its resting contact. of relay 420, right-hand armature and its working contact 01 relay 421, second armature (counting from the right) and its resting contact of relay 422, the ninth impulse stop conductor, the corresponding contact in the bank of the send.- ing switch SS, wiper 247 and stop relay 242 to battery. Stop relay 242 energizes over this circuit and places a shunt around the sending contacts 243 at armature 291; at armature 292 it disconnects magnet 245 from the interrul'iter and closes the restoring circuit; at armature 293 it opens the circuit of the stepping magnet 110 of the sequence switch S; at armature 294 it removes ground from, the locking conductor'217; and

at armature 295 it opens a point in the pickup circuit of pick-up relay 232. Responsive to the closure of the abovementioned restoring circuit of magnet 245 at armature 292 and its working contact, magnet 245 obtains ground from the wiper 246 tl'irough the self interrupting contacts 244 and spins the wipers 246 and247 around to the position shown in the drawing. This operation opens the circuit of the slow acting pick-up relay 241, which by Virtue of its slow action re mains operated for an interval.

Responsive to the opening of the circuit of stepping magnet 110 of the sequence switch S, armatures112 and 113 are advanced one step and wiper 113 disconnects the associated control conductor 209 from the first, wiper 3919 of the office register OR and connects it by way of conductor 128 to the second wiper 340 of the office register.

As a result of the removal of ground. from conductor 217 at armature 294 relay 239, Fig. 3, fallsback andprepares the pick-up circuit of relay 232, and relay 421, Fig. 5, falls back and removes ground from the ninth impulse stop conductor.

Responsive to the nine interruptions in the outgoingcontrol. circuit, line relay 41 of the selector S, Fig. 1, falls back nine tinns, and each time it does so it closes at armature 51 a circuit through armature and its working contact and series relay 43 for vertical magnet 49. Vertical magnet 49 operates to raise the wipers 6264 step by stop until they stand opposite the ninth level of bank contacts. Relay 43 isioperated in series withvertical magnet49 on the first 54,- and its working contact, ell-hormal contacts 50, interrupter conlaas G1, and stepping relay +l4lto battery. Relay ell energizes and closes a locking circuit for itself at a'inature 55, and at armature 56 pre pares a circuit for rotary magnet 48.

At the end of the vertical movement, relay 43 falls baclc and opens the initial circuit of relay ll at arnmture 54;, leaving this relay energized over its loclrii'ig circuit which is closed at armature At armature and its resting contact, relay ii-l closes circuit through armature 56 and its working con-- tact for rotary iagnet d8. Rotary magnet 48 energizes and advances the wipers (32Gl into engagement with the first set of bank contacts were raised during the vertical increment. Near the end of its stroke, rotary magnet 48 opens at the interrupter contacts b'l the circuit of relay 4 1 which relay falls back and opens a further point inits locking circuit at armature 55 and at armature 56 opens the circuit of rotary magnet 48, whereupon rotary magnet 48 falls back and closes its interrupter contacts again.

From this point the operation depencs upon whether the trunk line terminating in. the first set of bank contacts is busy or idle. if this trunk line is idle, switching relay l5 energizes right away, seizing the trunk. Assuming that the trunltline is busy, switching relay is short circuit'eifl by the ground potential encountered on the busy test contact by test wiper (323 and relay a l energizes through test wiper 63 and again closes its locking circuit at armature 55, closing the circuit of rotary magnet 56 at armature 4L8. Rotary magnet 56' energizes again and ad-- vanoes the wipers into engagement with the next set of bank cont-acts. r

This alternate operation of relay i l and rotary magnet 48 continues in the manner described until an idle trunk is reached, which trunk it will be assumed is the one terminating in bank contacts 65(}7. When this idle trunk is reached, switching relay 4.5, heingno longer short circuitcd, energizes from the grounded release trunk conductor 6 through oil-normal contacts 50, interrupter contacts 61, and stepping relay 414. Although relay l5 energizes over this circuit, relay l l does not operates on account of the re atively high resistance of relay Upon energizing, relay 45 opens the test circuit at armature 58 and connects the grounded release trunk conductor 6' to the test wiper 63, thereby making the seized in the level opposite which they.

trunk busy immediately. At armature '59 it disconnects ground from armature 51 of line relay ll, thereby opening the circuit of the slow acting release relay and a armatures aid (30- it disconnects ceiuluctors 5 and 7 from the windings oli line relay 4i and extends them by way of wipers 62 and El and the bank contact (35 and 67 to the lallzing coiuluctors oi the seized trunk line. The .iiuc and release relays associated with the seized trunk line now energize and the latter places ground on the release trunk conductor eXt-ei'iding back to and l'iern'iinating in the test contact 66 so to maintain the release trunk conductor (3 grounded after the slow acting release relay 42 falls back, as it now does, and after the release relay 9 of the trunk circuit- TC falls back, which takes place subsequently.

In the director, the slow acting pick-up relay falls back after the interval for which it is adjusted and opens the circuit oi. the slow acting relay at armature 288. Stop relay accordingly maintains its armatures attracted for an interval by virtue of its slow action. Relay 2 M also removes ground at armature 287 from conductor 3i so that the director may now be released in case the calling subscriber decides to abandon the call and hangs up the receiver. At arn'iature 290, relay All completes the connection between the piclcup conductor Q16 and relay E232, and at armature 289 it places ground on. ceiuluctor 217. Accordingly, the setting of the relay register comprising relays i'or the next code digit may now take place as soon as the drum 301, Fig. 4:, arrives in its pick-up position.

Assuming that the drum 301 has just passed its pick-up position, and that the set ting of the relay register in the director is delayed, the setting of the register may not be completed before stop relay falls back, in which case relay 242 at armature 292 and its resting Contact prepares the impulsing circuit of magnet 245, but this circuit is maintained open at armature 274- of the transfer stop relay 285. It, on the other hand, the setting of the relay register has been completed when relay 2&2 falls back relay 239 is energized with the result that magnet in'unediately starts to operate under the control oi? the interrupter 115.

The setting Oil the relay register for the second code digit will now be described. By referring to the intermediate distributing l'rauie lDF, Fig. l, it may be seen that the second code digit to be transmitted the digit 2 on account of the fact that the second hank contact 322 in the set on which the wipers of the office register are standing cross connected by means of the jumper 324; to the wiper 3 2 of the drum 301 corresponding to the digit 2. It will be noted that the drum 301 places positive battery on the ill) brush 312 in the A and C positions of the drum.

hen positive battery is placed on the wiper 312 in the A position of the drum 801., a circuit closed from ground through the drum 30L, wiper 312, juniper 32 1, bank contacts wiper 340 of the office register OR, conductor 356, the correspon'ifling contact in the bank of the oiiice re iistcr selector ()ltfh wiper 408, armature 416 and its working contact, condiiicto'r armature 26 i and its resting contact, armature 266 and its working contact, and polarized relay 255 to the derived neutral tap of the exchange battery. .ltolay thereupon energizes and at arn1atime 272 places ground on its positive contact, closing a circuit through armature 2'70 and its resting contact and conductor 21.0 for the right-hand winding of the A relay 419. Relay 4:19 energizes and closes at its lefthand armature a locking circuit for its lefthand winding, at the same time shitting its right-hand. arinatures to bring about the necessary circuit changes.

When the drum 301 advances ironrits A position to its B position, groan d is removed from brush 312 whereupon the iiolarized relay 235 in the director falls back and opens the initial circuit of. relay L-1t) leaving' this relay locked up at its left-hand armature. in its 13 position, the drum 301v closes a circuit from groundthrough brush 302' for the positive switching relay 2313. Relay 2253 energizes and shifts armature 270 from the conductor 210 (leading to the A relay 419) to condi'ictor 2l2 (leading to the C relay 421). \Vh'en the drum 301 arrives in its C position, ground is again placed on wiper with the results that the above describeiil circult is again closed from positive battery for the polarized relay 235, Fig. When relay 235 energizes at this time and grounds its iiositive contact lhttl'lll'ithlll'fi 272, it closes a circuit through ar1nature'270 and its worlc' hip; contact and overthe conductor 212 for the right-hand winding of the C rehy 42h whereupon relay 421 cnergizesand locks itself at its left-hand armature, and at its right-hand arniatures makes the necessary circuit changes.

The code-transfer stop relay 239 is encrgized and relays 232 and 238 decnergize the hercinbetore described manner when coni'luctor 216 is grounded the second time.

i Vhoi'i the .iinpulsing circuit otrelay 24:43 is closed from the interrupter 11.5 at armature 374, or at armature 292 and its resting contact, whichever point is completed last, relay 2.1.5 again starts to ei'iergize and deenergize under the control. of interrupter 115. The picloup relay 24l-operates again on the first step of wiper 2-1-6 as above descril'ied. Accordingly, on each succeeding step-of the wipers 24:6-and 2st? the outgoing controlcirture and resting contact of the B relay e20,-

uiiddl-e armature and its working contact oil" the C relay 421, the second .iinpulse stop conductor, the third contact in the bank of wiper 24:7, and stop relay 24-2 to battery;

The energization of stop relay 2-1-2 results in the termination oil the digit beingtransniitted and in the restoration of relay and the relays oi" the relay register, Jig. 5, in

the hereinbetore described manner.

The transmission or? the second digit results in the selector switchcontrolled over the trunk line seized by theselector S in response to the first digit raising its wipers to the second level and selecting an idle trunk line leading to the desired oiiice.

In the director, the setting}; oi the relay register again starts in the hereinbetore described mann r when pic up relay 241-1 falls baci the wipers 1.12 and .113 of the sequence switch S3 now being in their third position. ithen picku p relay 232 pulls up responsive to the arrival oi the drum 3011., Fig. 4:, in

i ts pick-up position, it again connects up the associated polarized relay to receive the inipuises i'roni the drum. in this case, since two code digits are suthcient to trunk the call to the desired office, the third and fourth code-digit positions are not used for the transmission of code digits and it is necessary to arrange for these positions to be shipped by the sequence switch C Therefore, the third contact 333 the contact set on which the wipers ot the oliice rep r are now standing connected by means of the jumper 325 to the skip brush 306 of the drum 2501. By .re'lerring to the table shown in Fig);- 9, it will be noted that the skipping operation requires that the relays A, B, and (i be operated. yAlso by referring to the showing); oil" the drum 301 it will be noted that current is supplied to brush 306 in the A, B, and G positions of the drum. That.- being the case, the A, B, and (i relays 51:19, 420, and 4-21, rcspectivcly, of the relay re}? 'ister, Fig. 5, are cneip ized in the i'lQitiiilJtliorc described mannerthrough the action oi the polarized relay 2325 and the switching tacts on the relays mentioned, and ov r con-- cuit is opened at contacts 243. The second interruption in the outgoing controlcircuit ductor 206-1101 skip relay 11 1. Relay 11 1 energiz and opens a point 1n the lnterer ru Jter circuit at armature 117 at arnia- 1 7 T I tore 116 closes a circuit through the trnrd contact in the bank of wiper 112 and the said. wiper, and the self-interimpting contacts 111 tor the g magnet 111) 011 the I rn 11" J. sequence switch S. rhat being bllG case, magnet 110 operates in a buzzer-l1 re manner to advance the wipers 112 and 113 until wiper 112 passes oi'i' the fourth bank cont: g .1-J 1 Q v 1 q "1111 nrj'rv' "20 ml t .1 and "(1.1103 on tut niti a.-.- ocia. \e con-act. The upper winduig oi" relay 231, liig. 3, now energizes over conductor 205, the hith contact in thebank of wiper 1 2 and said wiper, coi'i iacts 111 and ,luagnet 111).

231. Relay 231 operates and clo .in g circuit for its lower whirling at armatu e 251; places a shunt arouiul armature 27-1 and its working contact armature 250 so as to operate subseque 2415 from the interrupter 115 independent 01' the energization o the transfer stop relay 23$); removes ground at armature 2-H troin conductor 217; at armature 264-. discoinmcts conductor 209 leading to wiper 113 of the sequence switch S from the polarized relay 235 and connects it to ground. instead; at armature 63 places ground on release conductor 20 1; at arniatiu'e2lil breaks a i'ur ther point in the original test circuit 0; the oliice r 'ister selector QRS; and at arni .ure opens the initial energizing cirr 35 1, contact in the bani: oi. wiper ll/*6 and the said wiper, and armature 41-1 1 and its working contact.

Responsive to the above mentioned grounding oi release conductor 20+- by relay 231, Fig. 3, at armature 263, a circuit is closed through the working contact and armature 41:13, wiper 105, and the bank cortact on which it is standing and conductor 353 for release magnet 3415. lie ease magnet 345 energizes over this circuit and restores the Wipers 339 3 12 to their normal position. When the normal posl n is reached, oftnorn l spring 346 is separated from its associated cor.tac removing ground from-con ductor 354. Belay 102 now tails back and disconnects the associated wipers and at al-, nurture 114- opens further point in its own locking circuit.

Responsive to the grounding of w per 113 of the sequenceswitch S through conductor 209 and armature 2641 of relay 231, a cucuit is closed through the fifth contact in the bank of wiper 113 and over conductor 131 and through the normal contact in the bank of the wiper of the digit register 1 to :tly the magnet euit of relay 4-02 of the ol'lice register selector DR-1 and conductor 219'for stop relay- 2 13,

Fig. 3, in case the digit register DR-l has not yet been operated. In this case relay 2-12 pulls up to prevent the starting 01' the sending switch SS for, a definite length of time following the starting of the operation or" the digit register DR1.

As a result of the removal of the ground potential from the locking condiiictor 217 at armature 2 19 of relay 231, the relays, including relays 4 19- 121, Fig. 5, which are locked up by this conductor are unlocked. and fall back, the latter relaysopeniug the circuit of the skip relay 11 1 Fig. 2. Relay 114 is slow acting and for in a t reason maintains aruiat'ures 1 16 and 117 attracted for an interval after which it falls back and at am ature 1-1-7 completes a point in the sending circuit of magnet of the sending switch. SS. The reason for the delay in the falling back of relay 11 1 and in the closing of the sending circuit isto permit the digit register DR1 to become su'l'liciently advanced before the sender is started in case tli digit register moves 011 its normal contacts just as relay 231 is about to pull. up

and ground wiper 11 3 at armature 26ato close a holding circuit for relay 2412, Fig. 3, as previously mentioned; The delay occasioned. by relay 11 1* is of course a special delay, but lac delay governed by the time required for the stop 2412, Fig. 3, to fall back may take place on any one of the fol lowing digits.

Then the sending circuit is finally completed, the sending switch SS is again started and transmits the digit registered on the digit register Dl't 1'. The stop relay 2412 is energized over the following *ircuit to terminate the digit: From-ground by way of the working contact and arinat-ure 2641 of relay 231, Fig. 3, conductor 209., wiper 113, the fifth associated bankcontact, conductor 131, wiper of the digit register DR 17 the bank contact onwhich it was set by the calling subscriber, the associated impulse stop conducte -the corresponding contact in the sender bank, wiper 2 17 and relay 212 to battery. The energization of relay 2 12 results in the termination of the digit in the usual manner. The sequence switch S is, of course, advanced one step at the termination of this digit, and wiper 113' removes the ground from the wiper oi? the digit register DR1 and extends it over conductor 132 to the wiper of the digit register DR-2.

As soon as the piclcup and stop relays 24:1 and 2412 fall. back, the sending switch SSis started to transmit the digit registered on the digit register DR-2 in case the said register operated.-

The above described operationof the sending apparatus and of the sequence switch S continues as described until the digit stored on the digit register DR-4 is transmitted lili] tit conductor 206.

and is terminatednpon the pulling of the.

stop relay 2412 over conductor 13 i and the wiper ol the digit register DR4L. When .relay 10. Relay 10 responds to this flow of current and closes a locking circuit for itself at armature 17, and at armatures 16 and 1S disconnects conductors 5 and 7 from the windings of line relay 8 and connects them instead to conductors 5 and 7 of the selector S, at the same time disconnecting conductors 5 and 7 from the closed loop of the director. Line relay 8 falls back and at armature 11 opens the circuit of the slow acting release relay 9. Relay 9 energizes after a slight interval and removes ground from the release trunk conductor 6 at armature 13, leaving this conductor grounded through bank contact 66, wiper 03, and armature 58 and its working contact of the selector S. At armature 15, relay 1) opens a further point in thetest circuit of the di-- rector selector DS, and at armature l l it opens the circuit of switching relay 19, whereupon relay 19 falls back freeing the director.

The removal of ground from release trunk conductor 31, Fig. 3, when the director is freed, opens the circuit ofthe lower winding of relay 231 and opens the circuit of the relay 2 10. Relay 240 falls back immediately but relay 281 is maintained operated momentarily over its upper winding. Upon falling back relay. 240 opens "further points in the operating circuit of the oilice register selector ()RS at armatures 278 and-2'79; grounds the release condiiictor 20% at armature 280 (without any particular utility at this time) and at armatures 281 282 and 283 grounds the restoring conductors 205, 206 and 218. The grounding of the restoring conductor 206 does not have any utility at this time as the wipers 112 and 113 of the sequence'switch S have passed the contacts controlled by However, the groundin of conductor 205 results in the advance of the wipers 112 and 113 of the sequence switch S the remaining step to their normal position. y

The grounding of conductors 218 results in the closure of circuits for the release magnets of the digit registers DR1DR& and tor the release :rnagnet 106 of the sequence switch S, Fi 2-. Release magnet 106 re stores the wip 10S and 1.09 to ir normal position, whereupon its siren... is opens-:1 at

oft-normal contacts 107. The digitregisters DR1DR1 are released in the same manner. The director is now 111 thenormal position shown in the drawings and isready to he used in handling another call.

When the calling subscriber replaces h1s receiver at the end of the conversation,

ground is removed from therelease trunk conductor of' the established connection, whereuponrelay 45 of the selector S and relay 10 of the trunk circuit TOfall back. At armature 59, relay 45 closes a circuit through armatures 51 and 53 and ofi nornial contact-s 15 for release magnet 47. The energization of release magnet 17 over this circuit results in the restoration to normal of the wipers 6l-6 l, f whereupon folli norma'l contacts 46 open the circuit of release magnet 7 Considering now a case in which the director shown in Figs. 2, '3, 5 and 6 is used in in which a maximum number-of code digits f are required, the resetting of the relay registers comprising relays 419-422 continues lollowing thetransmlssion of each of the code digits in the manner described. herein before, and the operation of the sender continues until the termination of the fourth code digit at which time the sequence switch S advances its wipers 112 and} 113 into engagement with the fifthset of bank contacts. 7

This happens oicourse with relays 241, and

' 1e senci circui o 1e sent in swi c1 th in t ltl l g tlSS This circuit, however, remains open at armatime 292 of stop relay 242, Fig. 3, until stop relay2l-2 falls back. Furthermore, ground is placed on wiper 113 at armature 264 of relay 231with the result that if the digit register DR,1 isstillnin its normal position the stop relay 2 12fFig. 3, is held energized to preventthe sending operation from taking" place until a sulficient time is elapsed following the beginning of the operation of the wiper of the digit register DR1 for the reason hereinbefore given. It will assumed now that the trunk circuit TC is seized. as hereinloeforedescribed;

that the director; selector DS seizes the director shownin the drawing; that the office register selector ORS seizes the oliice register OR, Fig. 41, and that the oflice register OR is operated to bring the wipers 339342 into engagement with the bankcontacts reiterate in this set are cross connected rife. and. third di It will be noted that the first it tennis Cal nals, respectively, on the left-hand side of the intermediate distributing frame, IDF so as to bring. about the transmission of the. code 1621 It may beassumed that thebank contacts are assigned to an operators switchboard, for example .the switchboard of the, toll recording. operator which is reached from selector. banks: by the trans mission. I of v the code 163. case, no further digits are required and], it is desired .to operate the switching relay of the trunlrcircuitTC to switch the connection: through and free the-director at the end.

of the transmission of the third codedigit Accordingly, the fourth bank contact 008 is cross connected by means of thejumper 330. tothe SWlllClll'llQallGl'llllllfll on the left hand. side of the intermediate distributing frame.

IDF, which, terminal represents in the sw tching brush 305 of. the drum 801.

Therefore, whenthe fourth wiper of the otlice register is connected up the. following transmission of the;.th1rd code digit, current impulses are transmitted over the, switch ng brush 305 in the A, B, and D pesitionsof the drum 301, to set theA, B,and l) relays 419, I 420, and 4-22,respectivelv, ofrelay register,

Fig. 5, in accordance with the code given in Fig.0. lVi'th-xthese tlnreerelays operated, a groundpotent al is extended to the sw tching conductor 32 with theresult thatswitch ingrelay 10 of the trunk circuitTQ Figrl, energizesover its circuit herembefore traced and switches. the connection through and freesthe director. In. this case it will be ster selector QRSis noted that the office 1-0;, freedand the oflice register OR is released by the. action of the release *relay 240 rather than by the action. of relay 231 as hereinbefore described.

Referring now toFig. 7, this drawing.

shows a modification of theofiiee register OH and of the olfic'e register selector OBS to permit a reduction in the; number of wipers of theofiice register selector from, eight wipersas shown'inFig. 5, to-six wipers as sliOWn' in Fig. 7. I11;Fig. 7, the parts which are numbered that also appear maths-other drawings have the same. numbers as. they l1ave.in,such other drawings. 7 When this olfice registen selector OBS, .modified' as.

shown in Fig. 7, lS.;11S(-)d it operatesin the hereinbefore described. manner under the controlof test wiper 106 to select-an idle oflice register when theassociated director is seized. Assuming thatthefotlice register OR/is the oneselected, relay402 pulls up when thisidle oificeregisterfis reached and connects .up theassociated wipers. \Vhen wiper 108 is connected up at armature &16, a circuit is closedfrom-ioif-normal springs 346, contact in the banl eof wiper 108 and-1 said'wiper, armature 416 and its working contact, conductor 128, conductor 606, first contact in the bank of wiper 108, and wiper That being the.

108 to battery. Relay 60'1 energizes over this circuit and locks itself at arn1ature'602 independent of off-normal spring and itsflowe'r contact; disconnectswiper 340 at armature 603, and at armatures (30a and 605 disconnects conductors 357 and from wipers 341 and 342, and connects them instead to the rotary and vertical magnets and 3 13, respectively.

lVhen the first digit i; lialled, the impulses of current are transmitted over the usual path'to wiper 109 and thence by way of conductors 121 and 130,-working contact and armatureA-lS, wiper 110, the banlrcontact on which it is standing, conductor 358, and armature 605 and its working contact to vertical magnet. 343. Accordingv, the vertical magnet 3 13 operates to raise the wipers 33914342 opposite the desired level. of bank contacts. Off normal spring 3 16 is shifted on the first vertical step .ofthe. oflice,

register to groundthe release. trunk. con.-v ductor 354-, andatopensthe lllltlalCUICLHll of rela 601 leavinwrela' 601 ener ized over.

7 b y a) armature 602- and its working contact.

The wipers 108 and ofthe sequence switch S are advanced onestep in the -usual;-

manner at the end of the; first digit, and

wiper-109 moves from. its first contact to the of the second'series of impulses, and wiper.

108 removes battery from conductor 606. and places it on the start conductor208, whereupon relay 601, Fig. 7 falls back and connects conductors e56, 357, and 558,;0 the corresponding.:wipers 3 10, 3&1, andB-lQ, at the same time disconnecting conductors 358 and 357 from the-vertical and rotary magnets of the voitice register,

Tlie'remaining part f'theopera tion is the same as described hereinbefore.

Referring: now to Fig. v8, this drawing shows a modification similar to that shown in-Fig/T except that-{the wipers-05 also has been removed from the oflice registersclector. Corresponding changes have been made in the office register to permit it to operate satisfactorily withoutthe, releasing wiper 4105-.

The operation ofthe modification shown in Fig. 8., will now be described. When the.

otfice register selector OBS seizes the ofiice register OR, relay 4102' pulls up and connects up. the wipers 407- 110 and at armature 11d disconnects test wiper 106 from the test conductor 201 and connects it to ground directly instead 01 to conductor 203 as in Figs. and 7. When wiper 406 is grounded, a circuit closed through the normally closed contacts controlled byvarmature 7041 of the two step relay 701, Fig. 8, and through off normal contact 3 16 and its lower contact for the two windings of relay701 in series. The lower winding'of relay 7 01, however,is short circuited at this time'by the battery potential applied from wiper 108 of the sequence switch S through the first bank contact, condlictors 606 and 128, working contact and armature 116, wiper 408 and the bank coutact on which it is standing, conductor 356,

and armature 705 and its resting contact. That being the case, the two step relay 701 energizes only partially on account 01 the fact that its upper winding consists of a relatively small number of turns of wire having a comparatively high resistance per turn. Armature 703 is moved out of engagement with its resting contact. Armature 70 1 is moved into engagement with its working contact and the normally closed contacts controlled thereby are opened. Armatures 705, 706, and 707 are not operated. Armature 703 opens a point in the circuit of release magnet 345, and armature 7 04; locks relay 701 to the release trunk conductor 354: and disconnects the said conductor 35 1 from off-normal spring 346.

hen the tirst digit is dialled, the impulses of current delivered to wiper 109 of the sequence switch S are transmitted by way of conductors 121 and 130, working contact and armature 1-18, wiper 410 and the bank contact on which it is standing, conductor 358, and armature 707 and its resting contact to vertical magnet 343. The" vertical magnet 343 operates in the usual manner to raise the wipers of the oliice register opposite the desired level of bank contacts.

The second series of impulses is transmitted over conductors 122 and 129 and through the working contact and armature 417, wiper 109 and the bank contact on which it is standing, conductor 357, and-armature 706 audits resting contact to the rotary magnet 3 14, which. operates to rotate the wipers of the olliceregister into engagement with the desired set of bank contacts. I

\Vhen the wipers of the sequence switch S advance at the end of the second digit, battery is removed'by wiper 108 from conductor 606 and placed on start conductor208.

When this occurs, the lower winding 01' the two-step relay 701, Fig. 8,'is no longer short circuited and this relay energizes fully, operating the arniatures 705*707 to disconnect conductors 356 358 from their local connecand its upper contact so asto guard; the oliice register OR against seizure from an otlice register selector similar to ()RS until the restoration to normal has been completed.

At armature- 703 relay 701 closes a circuit,

through oil-normal contacts 702 or release magnet 3 15. The energization of release magnet 3 15 results in the restoration of the wipers 339-3l3 to their normal position in the usual manner, whereupon the circuit of relcare magnet is opened at otl-normal contacts 702. Furthermore, oil-normal spring 341:6 disconnects conductor 354 from ground and again'connects it to relay 701. The ethos reg ster OR is now ready for seizure again.

WV hat is claimed is:

1.111 combination, an oiiice register, a storage device, a sender, a plurality of circuits prepared by setting said otfice register,

means for setting the storage device over.

each circuit in turn, said means being con+ trolled exclusively over the circuit in use in each case regardless of the setting of the ollice register, and means for causing the storage device to controlthe sender each time it is set.

2. In combination, an oflice register, a storage device, a sender, a plurality of cir; cuits prenaredby setting said ofiice register, an. impulse machine for transmitting a variable series of code impulses over each circuit in turn to set said storage device a plurality of times, oncev over each circuit, andmeans for causing said storage deviceto control said sender each time it is set.

3. In a telephone system a director for routing a call in accordance with a code derived from the office designation in the called number, an oflice register tor registere ng the othce designation, said o'liice register having a wiper for each code, digit, means associated with said oflic'e register for transmitting characteristic impuls 5 through each i of the ol'lice register wipers in turn to the director, whereby a separate code digit is transferred to the directorover each wipe-r, a receiving device in saiddirector responsive to such impulses, and means in the director controlled by said receiving device for retransn'iitting eachdigit before the next digit is received.

4. In a telephone system, means for regis tering called numbers, said means including an oli'ice register adapted to be set in accordance with the oltice designating portion oi? a. number, a plurality of wipers on said oliice register, a storage device, means for setting said device over each wiper in turn in accordance with digits derived from the oliice designation, means for transmitting each digit when stored, and means for releasing the storage device each time it is transmitted to prepare for the storage of the next digit.

5. In a telephone system, a plurality of primary registers, a plurality of secondary registers, a device for generating positive and negative impulses, means for setting any one of said primary registers, and means including a polarized relay operated by said impulses in accordance with the setting of said primary register for setting oneot' said. secondary registers.

6. In a telephone system, a primary registor, a secondary register comprising a plurality of relays, a device for generating positive and negative current impulses, a polarized relay having positive and negative contacts leading to said secondary register, means for operating said primary 1' ister to ellect a connection between said sending device and said polarized relay whereby said relay is operated by certain of said impulses, and switching relays controlled by said device over circuit paths independent of said primary register to alter the connection be tween the said positive and negative contacts and the relays forming said secondary register. I

7. In a telephone system, primary and secondary registers, a controlling device for controlling said secondary register in accordance with the setting of said primary register, said device having a pick-up position and a number of other positions, means responsive to the arrival of said controlling device in its pick-up position to prepare circuits for setting said secondary register in the other positions of said device, sending mechanism controlled by said secondary register, and means responsive to the arrival of said controlling device in its pick-up position the second. time for starting said send ing mechanism.

S. In a telephone system, a plurality ot directors for controlling the establishment oi connections, digit registers individual to each director, and otlice registers common to said directors.

9. In a telephone system, a plurality of directors for controlling the establishment of connections, digit registers individual to each director, otlice registers common to said directors, and means included in each director and automatically responsive when the same is taken for use for selecting an idle office register. 7

10. In a telephone system, a plurz-ilil'y of directors for controlling the establishment of connections, digit registers individual to each director, oliice registers con'inion to said directors, and means IQSPUDE'HVQ to the seizure of a director by a calling subscriber tor connecting such director with an idle oflice director by a calling subscriber for connect-' ing such director with an idle otlice register, means effective after the oliice register is set for transferring the registration to the director, and means etljective upon the completion of the transfer for returning the othce register to common use.

12. In a telephone system, a plurality'of directors for controlling the establishment of connections, digit registers indiv'idualto each director, oilice registers common to said directors, means responsive to the seizure of a director by a calling subscriber for connecting such director with an idle otlice register, means eilcctive after the ollice register is set or transferring the registration to the director in the form of a code, the several digits of the code being transferred one at a time, means in the director for transmitting each digit as received, and means for restoring the office register to common use when the transfer of the code is completed.

13. In a telephone system, a director, means for seizing said director, a plurality of ollice registers, an o-l'lice register selector individual to said director responsive to the seizure of said director to seize an idle one of said ol'lice registers, means "For setting the seized oll'ice register in accordance with the oliice designation in the wanted number, subscriber digit registers in said director re sponsive to the subscriber digits of the num ber, sending mechanism in said director controlled first according to the setting of the seized ollice register and subsequently according to the setting of said subscriber digit registers to transmit series of impulses, and means responsive to the operation ofsaid sender in accordance with the setting of said oilice register for releasing said otllce register selector to free said seized ol'lice register.

14. In a telephone system, an ol'lice register, a plurality of digit registers, a sender for transmitting impulses as determined by -the setting of said registe a sequence switch for placing said sender under the control of said registers successively, a plurality of positions of said sequence switch being assigned to said ollice TP lSlZBI. whereby sa id

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