US1794603A - Automatic telephone system - Google Patents

Description

March 3, 1931.

H. M. FRIENDLY AUTOMATIC TELEPHONE SYSTEM Filed Aug. 24, 1927 5 Sheets-Sheet l nw l EW m E U c March 3, 1931.

Filed Aug. 24, 1927 H. M. FRIENDLY AUTOMATIC TELEPHONE SYSTEM 5 Sheets-Sheet 2 March 3, 1931. H. M. FRIENDLY 9 AUTOMATIC TELEPHONE SYSTEM Filed Aug. 24, 1927 5 Sheets-Sheet 5 itu- March 3, 1931. H. M. FRIENDLY AUTOMATIC TELEPHONE SYSTEM 5 Sheets-Sheet 4 Filed Aug. 24, 1927 Inventor- Herh eri-P'I-Ffiendl 1 Nofilll mMm- \Nv March 3, 1931. H. M. FRIENDLY AUTOMATIC TELEPHONE SYSTEM Filed Aug. 24. 1927 5 Sheets-Sheet 5 h QN EfiE n 6 E U PM Eu kknwnwkkhkmuknr ma wk Mum mMvww w F. MZWW. Lu W M Lu QMWM:H .U..P.FF%FPFFFFF Q NM 4% v.6 |y0|. k wi v MR QR w. a 2w 7 m K i R R mwfim mu g 4 V3 ll .3

QM MNN Inventor- Herb EI'HUI Friendly My im]- Patented Mar. 3, 1931 UNITED STATES PATENT orrlcs HERBERT M. FRIENDLY, OF CHICAGO, ILI IINOIS AUTOMATIC TELEPHONE SYS'JPELI Application filed August 24, 1927. Serial No. 215,034.

General objects An object of the present invention is to enable a subscriber of the automatic telephone system who has changed his telephone numher to a random location in the exchange system to be reached over the general trunking system of the exchange at his new number responsive to calling his old telephone number.

It is not new to cross-connect by jumper the terminals of the old telephone number to the terminals ofthe new telephone number so that calls directed to the terminals corresponding to the old number will be thereby in fact connected to the terminals of the new telephone number. However, the present invention is more particularly directed to the situation wherein the new telephone number is tributary to a remotely, situated central ofiice of the exchange system, and therefore 2 having a different oflice prefix. It is also directed to the situation wherein a subscriber having a single line will subscribe for a group of lines having a single calling number for the group, causing any call completed to the old number to be thereupon forwarded to his new group as a whole.

The present invention thus contemplates that when a new line number is assigned to a subscriber, particularly when it is not practicable to jumper the old line terminals to the new line terminals, call forwarding apparatus will be seized through the terminals of the old line when it'is called, the calling party perhaps not being beforehand apprised of the fact the wanted party has anew line number. When this apparatus is seized by the connector when its wipers are set upon the terminals of the old line, and in view of the pre-set condition of said apparatus, will 5 cause a train of impulse series to be sent and otherwise control the concerned circuits to extend the call to the terminals of the new line, regardless of into which central ofiice of the exchange it is tributar I -It will be understood that in place of the call being forwarded to a new line of the subscriber having the line called the apparatus may cause the call to be extended to some other random telephone line of the system, or to an operator employed by the operating concern, as the information operator, for example.

he present invention thus lends itself to saving calls to a subscriber who has moved to another central ofiice district of the exchange, without the delay or annoyance to the calling party as would be occasioned if the terminals of the line called were extended directly to an information operator of the operating concern who would inform the calling party of the new number after which the calling party would be obliged to hang up and initiate anew call. The call will be extended to the concerned subscribers new line without delay, the calledparty on said new line perhaps apprising the calling party of the number change so that future calls may be made direct to the new line by calling the new line number. A specific tone source T is provided which not only apprises the called party 5 at the time he removes his receiver in responding that the call is one forwarded from his old number, but it also apprises the calling party at the time the new line is seized that the call has been forwarded and to therefore be prepared for a slightly longer responding delay occasioned by the time taken in sendin the impulse train in forwarding the call.

The present invention thus enables a subscriber who contemplates being/absent from the city for a time arranging with the telephone operating concern to have all the calls directed to his line forwarded to some predetermined random line of the exchange. The no latter may be a trunk line leading to the desk of an operator in the employ of the operating concern, or it may be the line of some random subscriber of the system who has consented to respond to the calls for the absent subscriber.

A feature of the present invention is that the call meter of the line primarily called by the calling party will register a specific forwarding toll against the subscriber primarily called. This toll is in addition to and separate from the toll assessed against the calling telephone for the call to the terminals of the line primarily called. Of course, any desired plan of metering or assessing toll charges may be employed since the call from the telephone initiating the call to the line primarily called is essentially a normal call to that line, while the forwarded portion of the call is essentially a normal call from the primarily called line.

The same line switch B and call meter of the primarily called subscribers line is used as was formerly used when the call was in itiated on its corresponding line from telephone A, which telephone A is now disconnected.

In carrying out the present invention, the operating concern will provide a suflicient number of units of equipment apparatus shown in Figs. 2 and 5. It will then introduce these units into the desired lines as required, perhaps contingent upon specific rental payment. To introduce the said equipment units, connections between certain line terminals are opened, and certain line terminals are jumpered to the unit involving Figs. 2 and 5 employed. The designated jumpers in Fig. 5 are then run in accordance with what line is to receive the forwarded calls. In the exampled embodiment illustrating the present invention the call primarily completed by connector E in Fig. 4 to line No. 22311 is forwarded through the line switch B, individual to the latter said line, to line No. 33241. Of course, any other suitable kind of line switch may be employed; in fact a so-called finder switch mechanism may be employed in place 9f the line switch B. Using the same line switch B as formerly used by the subscriber insures the same class of rating to the forwarded calls as existed for originated calls of the subscriber with the least equipment change and record clerical work.

There are additional operative features of the present invention which will be described in the descriptions to follow relating to the exemplary embodiment of the present invention chosen to explain it, having in'mind that other features not specifically mentioned will be apparent from the descriptions and drawings. The invention is capable of varied modification without departing from its scope as defined by the subjoined claims.

Drawings With reference to the accompanying drawmgs Fig. 1 shows a disconnected telephone A and individual primary line switch B, the latter said switch in common with other line switches (not shown) having access to the group of secondary line switches containing the secondary line switch C.

Fig. 2 shows apparatus specific to the present invention introduced between the connector bank terminals and the leading-in terminals of line switch B of the line primarily called.

Fig. 3 shows a well known selector F acces'sible from the switch group containing the secondary line switch C, together with other indicated automatic switches and calling and called telephone lines.

Fig. 4 shows a well known connector E paving access to the terminals of subscribers mes.

Fig. 5 shows the impulse train transmitting apparatus cooperative with the appara tus shown in Fig. 2.

The various figures of the drawings are assembled so that the designated lines extending-towards the margins of the sheets containing them register.

Equipment The telephones A, A, AA and A are of the well known common-battery series automatic type.

The primary line switch B and the secondary line switch O are of the well known rotary type as described in the third edition of Hersheys Automatic Telephone Practice, page 53. The line switches LS and LS are like the line switch B.

The first selector F is of the well known type, sometimes designated as the Powell selector, and described on pages 59 to 61 in said book. The selectors G, H, J, K, L, N, P and Q indicated in Fig. 3 are like selector F.

The connector E shown in Fig. 4; is of the well known type as shown in Fig. 73. of the fourth edition of the said Hershey book.

The switch NO in Fig. 5 is generally like switch LS in mechanical construction, but is arranged to have a home position to which it returns and at which it rests when not in use in a call. The drawing Fig. 5 shows this switch NO in the home position.

The switch DF is mechanically like switch NO. However, the wiper 524 of switch DF is so designed as to not disengage a bank terminal it is resting upon at any time until it contacts with the next succeeding bank terminal in order that when it once receives ground from source 528 it will continue to receive it until it advances to the home position as shown in the drawing.

Of course, the specific switches may be subof the present invention. The present invenstituted for by any switch meeting the requirements, without departing from the spirit tion primarily resides in Figs. 2 and 5, cooperated with elements of a well known automatice telephone system illustrated in Figs. 1, 3 and 4.

Gall from telephone A to telephone line 2231] under the condition that the subecr'z'ber of the called line has a new line 332.41 tributary to a different central oyfice than fomerly V In view of the well known operation of the line switch LS, first selector J, second selector N, third selector Q, and connector E, and in view of the references to the third and fourth editions of the said Hershey book, it is thought unnecessary to recite the detailed operations of the switches responsive to the directive operations of the calling party at telephone A for causing the wipers 424 to 426 of the connector. E to be set upon the bank terminals 427 to 429, respectively, of the line Number 22311.

Let itbe assumed that the bank terminal 427 constitutes battery potential derived through the winding of relay 203 over an obvious circuit path, due to no other connector of the group containing connector E- being in seizure with the multiples of said terminals 427 to 429 at the time said terminals are selected by connector E. The wiper closing relay 431 in connector E will actuate and lock to effect the seizure of the latter said terminals, changing the battery potential previously existing on bank terminal 424 to ground potential to guard the seized line switch B against further seizure by another connector of the group containing connector E, should some other party call for the line Number 22311.

Ground applied to bank terminal 427 is continued overconductor 432, armature 202 to the winding of relay 203, thelatter said relay actuating. A circuit path can now be traced from the winding ofslow-releasing line relay 19 in the primary line switch B, armature 20', conductor 21 make-beforebreak spring 206, armature 207, conductor 208, armatures 501 and 502 in inulti'ple,-'conductor 503, armature 209, make-beforebreak spring 212, conductor 213, armature 24 to ground 'on the resting contact thereof. It will be noted that the traced'loop'including the armatures 20 and 24 of the primary line switch B is equivalent to the condition of closing; a conductive circuit path through the telephone A, assuming the conductors 21 and 213 disconnected by opening the jumpers to.

terminals 25 and 27 and the terminals 25.26 and 2728 connected by tie conductors,- respectively- The terminals .25, 27-and 29 were The switch B will thus operate in the well known manner to extend the connection from the multi led armatures 501 and 502 to a secondary l1ne switch as C and the latter said switch will then further extend the connection to a first selector as F.

It will be noted, in this connection, that the conductor. 213 is maintained at ground potential first by the ground applied throughtion battery applied through the upper winding of relay 301 leads over an obvious ath to ground through the lower winding 0 the lattersaid relay. This will provide sufiicient battery potential on conductor 213, applied through armature 214, to operatively energize the upper winding of relay 217, which relay will look through armature'218 to conductor 432 as long as conductor 432 remains grounded.

Ground is now applied through armatures 221 and 222, conductor 223 to the winding of relay504, the latter said relay actuating to start the predetermined: directive. impulse series train corresponding to Number 33241 of telephone A, as will appear presently.

Bank terminals 505 to 509 cooperative with wiper 513 correspond to the E-fir-st. to thefifth digit, respectively, of any train of five digit series to be sent in forwarding the call from the line corresponding to telephone A, for example. Inasmuch as in'the assumed case the call is to be forwarded to telephone Number 33241, the terminals on the cross-connecting rack designated X in Fig. 5 correspond- --ing to said bank terminals 505 to. 5O6 will be phone number, it woul l;only be necessary to Icortespiondingly run the five jumpers leading from the numerical order terminals corresponding to 505 to 509 to the corresponding digit terminals Y. r

, Relay 504 being actuated, armature 511ap- I plies ground over conductor 512 through wiper. 513, bank terminal 505 to 'the digit terminal in the. group Y correspondingato digit 3. Armature 517 appliesf ground re- 31 ceived through wiper 513, bank terminal 505,

of relay 301 wipers 539536 to theiwinding of relay 515, the latter said relay actuating and locking to grounded armature 514, it being noted that relay 515 can only actuate provided the wipers on shaft 533 are in their drawn positions.

Sending of forwarding impulses will be applied through armatures 518 and 519 to operate motor magnet 520 and relay 521 in multiple, respectively. The motor magnet 520 and the relay 521 will successively attract their armature so long as armatures 51S and 519 remain retracted. The wiper 524 is stepped to bank terminal 527 res onsive to the operation of the interrupter 5 so that ground 528 is then applied over conductor 529, armature 530 to the winding of relay 531, the latter said relay actuating.

Sending first digit impulses in forwarding call The wipers on shaft 533 will be driven forward responsive to the operation of interrupter I until the terminal 535 corresponding to digit 3 is'encountered by wiper 536, the relay 531 being maintained constantly actuated from the ground 528, and the rela 521 transmitting successive open impulses e fective to the selector F. 1

At the time wiper 536 engages bank terminal 535 three open impulses from armature 501 on relay 521 will have caused the wipers of the selector F to align with the third level of bank terminals. Also, at the time wiper 536 engages bank terminal 535 a circuit path can be traced from grounded armature 511, wiper 513, bank terminal 505, jumper 538, digit terminal 3 on the cross-connecting rack group Y, hank terminal 535, wiper 536, wiper 539, bank terminal 540, conductor 541 to the winding of slow-releasing relay 523, the latter said relay actuating, armature 530 locking it through wiper 524 to ound 528 so long as wiper 524 is oil the ba terminal it is shown resting upon.

When the relay 523 actuates, armatures 501 and 502 will retract to maintain the closure of the circuit path including the conductors 208 and 503, in order to 've selector F time to rotate-in and seize t e first idle trunk leading to selector G in the direction of the telephone A. Armature 545 applies ground received from conductor 529 over conductor 546 and through interrupter contact and'armature 547 to operate the motor magnet 520 to restore the wipers on shaft 533 to the drawn position, at which position the ground is removed from conductor 529.

Sending second digit impulses in forwarding cal Armature 549 applies ground to the winding of motor magnet 550, so when relay 523 deactuates the-wipers on shaft 552 will be advancedone step. Wiper 513 now applies ground to bank terminal 506 and over jumper 553 to bank terminal 535, corresponding to digit 3, as before. Also, due to the deactuation of relay 523 the interrupter 1 will start driving the wipers on the shaft 533 in the manner before described until the wiper 536 encounters grounded bank terminal 535, causing three open impulses to be transmitted from armature 501 effective to' selector G, the wipers on shaft 533 restoring to the drawn position thereafter as before described when the first series of three open impulses were sent to selector F. The shaft 552 will be caused to advance upon its wipers one step when relay 523 deactuates following the sending of the second digit 3. Wiper 513 now applies ground to bank terminal 507 and over jumper 556 to bank terminal 557 corresponding to digit 2. Y

Sending third digit i'zzilpulses in forwarding Sending fourth and fifth (last) digit impulses in forwarding call In view of foregoing-descriptions and the jumpers 561 and 562, it will be clear that two more series of open impulses will be sent. The series corresponding to jumper 561 will be a series of four impulses, and the series corresponding to jumper 562 will be a sin le impulse. The last two series serve to set 1: e connector R on the terminals of the line Number 33241 (assumed idle), leading to telephone A'. The connector R will thereupon send ringin bell at telep one A.

Excluding impulse sending apparatus At the time the motor magnet 550 retracts its armature 571 the fifth time, following current to operate the signal no i bank terminal 427, wiper 424 to ground on make contact of attracted armature 433.

Responsive to the actuation of relay 232,

the relays 203 and 504 will deactuate in sequence. Under the present condition the extension to the telephone A from bank terminals 428429 has the windings of the polarized relay 233 bridged across the talking conductors 21213 with the armature of said relay 233 tilted counter-clockwise into the dotted position designated Ring. pos., the armatures 235236 being attracted.

Slow-releasing relay 237 is energized so that tone from source T is applied through armature 240, audible to the party at tele phone "A indicative that the call has been forwarded, the periodic induction tone from the ringing generator Gr being also heard, the latter indicative that the connector E has seized, it having been applied from the time the connector relay 431 actuated.

Responding at telephone A When the receiver is removed from the switch-hook of telephone A, the current proj ected back from the front-bridge relay in the connector R responsive to the actuation of the back-bridge relay therein will be reversed in direction through the windings of the polarized relay 233, under which condition the armature of relay 233 will tilt clock-wise into the dotted position designated Ans. pos., so that the relay 241 will be operatively energized, the relay 237 deactuatlng consistent with its slow-releasing characteristic, but the latter said relay sustaining long enough for the party responding at telephone A to perceive the tone from source T to apprise him that the call was forwarded from the terminals of a line primarily called. This latter information prompts the responding party to inform the calling party of his new telephone number, so that calls to telephone A may thereafter be made direct. The latter affords shorter path as well as obviating the forwarding charge as would be registered on the call meter associated with the line switch B, at the time the party at telephone A responds. The said call meter has two windings. The lower winding is an electropolarizing winding sufficiently strong to sustain its armatures after they attract so long as there is ground on the release trunk conductor 16. The upper ,winding energized cumulatively with the lower winding when the current is reversed through it when the called party at telephone A removes his receiver. The armature 41 short-circuits the upper winding and the resistor 42. Meters 60 operating thus are not new in the art as applied to simple calling lines.

Also, responsive to the removal of the receiver of the called telephone A, the relay 241 will cause its armature 243 to connect the 5 retardation coil 245 in bridge between the bank terminals 428-429 to energize the ringcut-oif relay 438 in connector E, followed by the actuation of the back-bridge relay 442. So that the current will not only be reversed back to the polarized relay 233 responsive to the subscriber at telephone A removing the receiver from the swltch-hook, but the current will be reversed back over the line including the calling telephone A by the operation of the relay 442, consequent thereto. The latter reversal will cause the call meter of telephone A to register a call. A call is thus registered against each telephone A and A for the completed call which was forwarded to telephone A.

Talking path between calling telephone A and called telephone A When the relay 241 actuated, attracting armature 243, the talking path from telephone A to conductors 439440 is continued through condensers 251-252, springs 206- 212, conductors 21-213, armatures 2024, respectively, and over the heavy talking conductors, including conductors 31 and 302 to telephone A.

Subscriber at telephone A replaces receiver on switch-hook while subscriber at telephone A retain; his receiver of If the subscriber at telephone A\'- first replaces his receiver after terminating the conversation the deactuation of back-bridge relay in connector R resultant thereto will cause the direction of current to be restored so as to operate the polarized relay 233 to deenergize relay 241 and operatively energize relay 237 to apply tone source T and also remove the retardation coil 245 from the bridge, so that the hack-bridge relay 442 in connector E will deactuate. The winding of polarized relay 233 is still in series with the front-bridge relay in connector R, so the latter said connector is still in seizure of the line leading to telephone A.

Subscriber at telephone A replaces receiver on switch-hook Upon the subscriber at telephone A now replacing his rmeiver on the switch-hook, the front-bridge relay and its local slow-releasing relay 446 in connector E will deactuate and cause the obvious circuit for the release magnet of connector E to operate to restore said connector 'E. This will remove the ground from conductor 432, so that the relay 232 will deactuate, thus removing the winding of polarized relay 233 from the said series relation with the front-bridge relayin connector R, so that the saidconnector R and antecedent switches H, G, F, C and B employed in forwarding the call will be thereupon restored. The switches Q, N, J and LS antecedent to connector E and dependent upon' relay 446 will also restore. so that the circuits employed in the connection are now normal and in re-adlness for new use.

Subscriber at telephone A replaces receiver on switch-hook while subscriber at telephone A retains his receiver of If the subscriber at telephone A first replaces his receiver atter terminating the conversation, the deactuation of the front-bridge relay 446 in connector E resultant thereto will cause a circuit to be prepared for the release magnet of said connector E and the ground removed from the release trunk so that the antecedent switches Q, N, J and LS will restore, the said connector E remaining in seizure, since the retardation coil 245 is still in series with the back-bridge relay 442. The winding of the polarized relay 233 is still in series with the front-bridge relay of connector B, so that the replacing of the receiver at telephone A produces no operative effect beyond connector E.

Subscm'ber at telephone A replaces receiver on switch-hook Upon the subscriber at telephone A new replacing his receiver on the switch-hook, the back-bridge relay of connector R will deactuate to restore the direction of current traversing the winding of polarized relay 233, so that the relay 241 will be deenergized and thereby remove the retardation coil 245 from the bridge, so that the back-bridge relay 242 in connector E will deactuate. The winding of the polarized relay 233 is still in series with the front-bridge relay in connector B, so that. the latter said connector is still in seizure of the line to telephone A.

When the back-bridge relay 442 in connector E deactuates, it closes the obvious circuit for the release magnet of connector E to operate to restore said connector E. This will remove the ground from conductor 432 so that relay 232 will deactuate, thus removing the winding of polarized relay 233 from the said bridge relation with the front bridge relay in the connector B, so that the said connector B and antecedent switches H, G, F, C and B employed in forwarding the call will thereupon be restored, the circuits employed in the connection being now normal.

. Restoration of impulse sending apparatus At the time relay 203 deactuated, following the last impulse of the train, the armature 222 opened the energizing circuit for relay 504 and its dependent relay515. Ground from armature 569 will be applied through the interrupter armature on motor magnet 550, causing the shaft 552 to restore the wipers thereon to the drawn position..

Ground from armature 571 will be applied through wiper 572 and through the interrupter armature 547 causing the shaft 533 to restore the wipers thereon by driving them forwardly to complete a cycle to the home position shown in the drawing.

It will be noted that if the call is abandoned by the calling party at telephone A before the impulse sending mechanism has completed its operation and relay 232 has actuated and locked, the busy ground will be removed from bank terminal 427 and multiples thereof. The said terminals are thereupon subject to seizure, although the wipers of the elements NO and DF may not have restored to the drawn position. In order to prevent the call made under this condition being vitiated, the relay 515 is disabled from actuating until the wipers of the elements N0 and DF have restored to the drawn position, so that even if the terminals corresponding to terminals 427 to 429 are seized while the said wipers are not in the drawn position, the said wipers will restore before the armatures 569 and 571 can attract and before the upper armature of relay 515. can attract to apply ground impulses to the motor magnet 520. Unless the wipers of the elements N0 and DF are in the drawn position there can be no ground from armature 511 applied through the armature 517 to initially energize the winding of relay 515 so that impulses can be applied to the winding of relay 521 to cause forwarding impulses to be efi'ectuated.

Line leading to telephone A encountered busy when call is forwarded thereto If the line leading to telephone A is encountered busy when the call primarily directed to telephone A (line Number 2211) is forwarded thereto, the busy tone applied to the upper talking conductor in connector R will pass over the upper talking conductor of the connection to conductor 21, spring 206, armature 235, condenser 251, conductor 439, bank terminal 428, tone condenser 445, audible to the subscriber at telephone A, having in mind that this tone will be particularly distin uishable during the silent ringing periods rom generator G, since there will be aggnerator tone during the live ringing per1o s.

The terminals 427 to 429 correspond to the line Number 22311. The terminals 461 to 463 correspond to another random line which is connected by the indicated and designated ]umpers in Fig. 2 so that the terminals 427 to 429 are in multiple with terminals 461 to 463,

respectively. That is to say, the telephone A may answer calls primarily directed to any one of a plurality of lines. Of course, if any one of the said plurality of lines is busy, all the rest of the lines of said plurality will be guarded against seizure. However, this method of connecting saves apparatus sets as shown in Figs. 2 and 5, connected individual to each line where the calls (which maybe infrequent) are to be forwarded to the same telephone number. The lines commonly served by the same apparatus set shown in Figs. 2 and 5 need not necessarilv be accessible from the same group of connectors as contains connector E. The lines; any plurality of them, may be served by random connector groups of the central oflice.

" It will be clear that when the subscriber having the new telephone number as 33241, fails to note the tone from source'T when responding to calls, he will know that parties calling him know his new telephone number, so that he can dispense with the facility for forwarding from his old number. The operating concern can then employ the forwarding apparatus disclosed in Figs. 2 and 5 in connection with some other subscribers line by cross-connectin it into the desired said line and also suita ,ly changing the jumpers indicated at the terminal groups X and Y in accordance with the new line to which calls are to be forwarded. In foregoing descriptions, the call to line Numl'ier 22311 was forwarded to line Number 33241, employing the primary line switch B formerly used by the telephone A when it was in service. It will be understood that the conductors 21 and 213 may be extended to a primary line switch other than B, or that the unit constituting Figs. 2 and 5 may also include as a component part thereof a primary line switch having access to the secondary line switch group containing switch G. In fact, the conductors 21 and 213 may be extended to a first selector by any well known or suitable means in carrying out the present invention.

Where the unit or set involving Figs. 2 and 5 also includes a primary line switch for forwarding the call to the first selector, it will then only be necessary to run jumpers indicated and designated in Fig. 2 to introduce the call forwarding apparatus with respect to a desired line. Account of the calls forwarded may be taken from the call meter of the line switch belonging to the primary line switch of the forwarding set. Of course, in place of the primary line switch, a finder switch arrangement maybe employed. In view'of the last foregoing, it will be clear thatthe conductors 21-213 may correspond to the designated line conductors leading to the upper and lower inside armatures of relay L in Fig. 22 in the third edition'of Hersheys Automatic Telephone Practice, and

under that condition calls to the terminals of line Number 22311 accessible from connector E will be forwardedthrough the indicated first selector to the subscribers new line orv other predetermined line'.

In foregoing descriptions of the exemplary form of the present invention as applied to forwarding'calls where telephone service has been discontinued on a subscribers line has been explained. The present invention, however, has other applications and uses, among which is its employment in connection with so-called private automatic exchanges. Its use in the latter connnection will be where there are one or more subscribers or other lines of the general exchange system that are called frequently. Apparatus corresponding to Figs. 2 and 5 is introduced between a random, bank terminal set of a local-connector corresponding to E and a line switch corresponding to B having access to main exchange trunks which terminate in. an incoming switch corresponding to F. Thus, when the particular main exchange line is wanted the private automatic exchange subscriber will cause the local connector to seize the terminals corresponding whereupon the impulse sending apparatus will send the train of impulse series to forward the call, theimpulses starting when the said incomingswitch is ready to receive directive impulses, in the manner as has been explained with reference to selector F wherein relay 217 is caused to operate to start the sending of the impulses 1n accordance with the jumper connections in .between terminals X and Y of the cross-connecting rack. Thus, while the main exchangemay be a system requiring five digits to be sent to reach the desired line, and the usual digit 0 may be first required to select the main exchange trunk in general main exchange calls from the private automatic exchange, the specifically arranged numbers may be called by simply removing the receiver and sending two series to set the local connector as if a local line of the private automatic exchange were wanted.

lVhile the present disclosure illustrates switches having movable connective terminals, it will be understood that this is merely by Way of illustration, and that therefore any switch mechanism having equivalent objects may be substituted without departing from the spirit of the invention, and the intent of the claims defining the exampled disclosure.

The scope of the present invention will be comprehended in view of the broadest interpretation of the subjoined claims.

I claim 1. In an automatic telephone system, a calling line, a called line, a numerical position designation of the called line in the systone with respect to the calling line, a plu-, rality of numerical switches each said switch used as alink in effecting a connection by said switches from the calling line to the called line,means for directivcly opcr-' ating certain of saidswitches over the calling line responsive to sending an abbreviated numerical position designation of said called line over the calling line, and automatic directive means introduced responsive to cozn-' connection.

2. In an automatic telephone system, a switch, a movable connective terminal of the switch, a'fixed terminal of the switch cooperative with the movable terminal, a called line, automatic switch mechanism for extending connection from the fixed terminal to the called line, an impulse sending device, and means responsive to selecting the fixed terminal by the movable terminal for causing the impulse sending device to generate impulses effective to automatically directively operate the switch mechanism from a point intermediate of the fixed terminal and the called line to extend connection from the fixed terminal to the called line.

3. In an automatic telephone system, a calling line, a called line, a plurality of automatic switches, impulse generating means for directively operating the respective switches to link a call extension by said switches from the calling lineto the called line, said means involving a device on the calling line for generating impulses for directively operating a first portion of said switches and also involving another device on the call extension from the calling line for generating impulses for directively operating the remainder of said switches responsive to the opera tion of said first portion of said switches, wherein all said operated switches are talking links of the completed call extension from the calling line to the called line, and terminals arranged for variably cross-connecting connections to cause the said another device to generate corresponding impulses at will in accordance with which called line is concerned.

4. In an automatic telephone exchange system, an automatic switch, a movable connective terminal of the switch, fixed terminals of the switch cooperative with the movable terminal, a plurality of lines, each said line having a numerical position in the exchange system, automatic numerical switch mechanism for extending connections from a random said fixed terminal to a corresponding one of said lines, and automatic means operated responsive to selectin a random said fixed terminal by the movable terminal for thereby causing said switch mechanism to operate in accordance with predetermined numerical selective movement to extend a connection from the fixed terminal selected to the corresponding one of said lines.

5. In a telephone exchange system, a switch, a movable connective terminal of the switch, fixed terminals of the switch cooperative with the movable terminal, a plurality of numerically positioned lines of the exchange system, a plurality of automatic switches, means for causing certain of said switches to operate responsive to numerical directive control to extend a connection from a random one of said fixed terminals to a corresponding one of said lines, and automatic means operated responsive to selecting a random one of said fixed terminals by the movable terminal for causing certain of said switches to be interlinked by numerical directive control to extend a connection from the selected said fixed terminal to its corresponding one of said lines wherein all said switches are links of the completed exten- SlOIl.

6. In an automatic telephone exchange system, a switch, a movable connective terminal of the switch, fixed terminals of the switch cooperative with the movable terminal, subscribers lines positioned numerically in the exchange system, a plurality of automatic switches, numerically directive control means for causing a plurality of said switches to operate to complete a connection from a random one of said fixed terminals to one of said lines, and automatic means operated responsive to selecting a predetermined one of said fixed terminals by the movable terminal for causing said switches to complete a connection from the fixed terminal selected to a particular one of said lines.

a 7. In an automatic telephone system, a calling line, a called line, a directive calling device on the calling line, a plurality of automatic switches for linking a connection from the calling line to the called line, means for directively operationg a portion of said switches directly responsive to impulses sent from said calling device, and automatic means'responsive to the operation of said switches for directively sending impulses generated at a point in the said linked call extension for operating the remainder of said switches to complete a call extension from the calling line to the called line wherein all said switches are links of the com pleted extension.

8. In an automatic telephone system, an automatic connector switch adapted to con nect to fixed terminals of a called subscribers line and apply current to the connection from the connector to the subscribers line called for operating a calling signal thereon, movable terminals of the switch, fixed terminals of the switch, means for automatically operating the switch to set the movable terminals on the fixed terminals, an impulse sending device, and means made effective responsive to setting said movable terminals on the fixed terminals for causing the impulse sending device to send impulses from a point succeeding the connector.

9. In an automatic telephone system, an automatic linking switch through which calls are extended as a talking path, movable terminals of the switch, fixed terminals of the switch. means for automatically operating the switch to set the movable terminals on the fixed terminals, an impulse sen-ding device, another automatic switch, and means made efiective responsive to setting said movable terminals on the fixed terminals for causing the impulse sending device to send a predetermined series of impulses to operate the said another switch in a corresponding manner.

10. In an automatic telephone system, a calling line, :1 called line, a plurality of automatic connective switches, impulse generating means for directively operating the respective switches to link a call extension by said switches into tandem links of the extension from the calling line to the called line, said means involving a device on the calling line for generating impulses for directively operating a first portion of said switches and also involving another device on the call extension from the calling line for generating impulses for directively operating the remainder of said switches responsive to the operation of said first portion of said switches.

11. In an automatic telephone system, a calling line, a called line, trunk links, an automatic connective switch terminating the respective trunk links, impulse generating means for directively operating the respective switches over its corresponding trunk link to link a call extension by said links in tandem from the calling line to the called line, said means involving a device on the calling line for generating impulses for d1- rectively operating a first portion of said switches and also involving another device in one of said trunk links for generatingilnpulses for directively operating the remainder of said switches responsive to the operation of said first portion of said switches.

12. In an automatic telephone system, a calling line, a called line, a plurality of automatic connective switches, impulse generating means for directively operating the respective switches to link a call extension by said switches in tandem from the calling line to the called line, said means involving a. device on the calling line for generating impulses for directively operating a first portion of said switches and also involving another device on the call extension from the calling line for generating impulses for 5 directively operating the remainder of said switches responsive to the operation of said ,first portion of said switches, wherein all for operating the switch mechanism to cll'ect a connection from the calling line to a desired one of said called lines, other switch mechanism, another called line, and means depending upon which of said first mentioned called lines is connected to by first said mechanism for causing automatic directive control impulses to be generated on the line called to operate said other switch mechanism to further extend the connection from the calling line to said another called line.

14. In an automatic telephone system, a calling line, called lines, automatic switch mechanism, means on the calling line for generating automatic directive control impulses for operating the switch mechanism to eti'ect a connection from the calling line to a desired one of said called lilies, other switch mecha nism, another called line, means depending upon which of said first mentioned called lines is connected to by first said mechanism for causing automatic directive control impulses to be generated on the line called .to operate said other switch mechanism to further extend the connection from the calling line to said another called line, and means antecedent to said another called line .for permanently indicating that a response has occurred on said another called line, regard. less of the fact that the connection may be thereafter destroyed.

15. In an automatic telephone system, a calling line, called lines, automatic switch mechanism, means on the calling line for generating automatic directive control impulses-for operating the switch mechanism to effect a connection from the calling line to a desired one of said called lines, other switch mechanism, another called line, means depending upon which of said first mentioned called lines is connected to by first said mechanism for causin automatic directive control impulses to be generated on the line called to operate said otherswitch mechanism to further extend the connection from the vcalling line to saidanother called line. a tone source, and means for applying said tone source audible on the calling line indicative that the call has been further extended from the line originally called.

16. In an automatic telephone system, a calling line. called lines, automatic switch mechanism, means on the calling line for gen 0 'ating automatic directive control impulses for operating the switch mechanism to effect a connection from the calling line to a desired one of said called lines, other switch mechanism, another called line, means de pending upon which of said first mentioned called lines is connected to by first said mechanism for causing automatic directive control impulses to be generated on the line called to operate said other switch mechanism to further extend the connection from the calling line to said another called line, a tone source, and means for applying said tone source audible on the said another called line indicative that the said another called line was not the line primarily called.

17 In an automatic telephone system, a calling line, a called line, automatic switch mechanism, an impulse storing and sending device on the calling line, the said impulse device for storing and thereafter sending a train of ser es of directive impulses to operate said switch mechanism to link a. connection from the calling line to the called line, and means controlled from the switch mechanism over the called line to start the directive impulses from the sending device only when the switch mechanism is ready to receive the first impulse to start the extension of the call, and means whereby all successive impulse series of the train are sent solely self-controlled by the storing and sending device.

18. In an automatic telephone system, a calling line, a called line, automatic switch mechanism for linking a connection from the calling line to the terminals of the called line, and means individual to the called line but involved in said switch mechanism and located antecedent to the terminals of the called line for permanently indicating that a response has occurred on the called line, regardless of the fact that the connection may be thereafter destroyed.

19. In an automatic telephone system, the method of extending a call to a subscribers new telephone line number which line number has a specific numerical position in the telephone exchange system, which method consists in generating impulses on the calling linecorresponding to the numerical position and designation of the subscribers old telephone line number and introducing impulse generating apparatus on the said old line pre-set to cause impulses to be generated thereby in accordance with the new line numher so that a call directed to the said old line number will be forwarded to the said new line by automatic switch mechanism directed by said impulses generated on the old line in accordance with said pre-set impulse generating apparatus wherein the party making the call from the calling line is unaware of the new line number to which he directed the completed call solely by the impulses generated on the calling line and which impulses e-nesponded to the old line number.

In an automatic telephone system, the

-zz' tho-:1 of extending a talking connection from a calling line to a desired numerically positioned called line of the system, consist-- ing of directively operating numerical connective switch mechanism by directive im pulse control applied over the calling line in accordance with only an abbreviated designation of said called line, to extend the connection towards but not to be called line, wherein other automatic numerical switches responsive to the operation of said switch mechanism are thereby caused to automatically operate in accordance with the remainder of the numerical designation of said called line, to complete the said extended connection to the called line, and wherein the said switch mechanism operated by directive impulses applied over the calling line forms only part of the completed talking connection from the calling line, and which said completed talking connection includes said other numerical switches.

21. In an automatic telephone system, a selective switch, a leading-in conductor for the switch, means for grounding said conductor, a relay the energizing winding of which is connected to the said conductor and short-circnited by said grounding, means for causing the switch to selectively operate, and means for causing the relay to operate from said winding responsive to completing the selective operation, the last said means involving the removal of said grounding.

22. In a telephone system, a leading-in conductor, a selective switch terminating the leading-in conductor, a directive switch accessible from the selective switch for extending connection ahead from the leading-in conductor, means for grounding said conductor, an impulse sending mechanism companion to the said conductor, a relay the energizing winding of which is connected to said conductor and short-circuited by said grounding for starting the operation of the impulse sending device to send impulses effective to the directive switch to selectively extend connection ahead from the leading-in conductor, and means for causing the relay to operate to start the sending operation responsive to completing the connection to the directive switch, the last said means involving the removal of the said grounding, whereby the directive switch is caused to be selectively operated to further extend the leading-in conductor.

23. In a telephone system, a two-section talking linkconsisting of near and remote sections, means for effecting connection to the near section and away from the trunk via the far section, a relay connected in bridge of the talking conductors of the far section of said link, an open pair of contacts of the near section, current for application over the far section, and means whereby depending upon the direction said current flows over the far section will determine whether or not 1,794,eoa

the said open contacts will be closed so that over the talking conductors of the near section only under the condition of the current flow over the far section being in predetermined direction.

24. In a telephone system, a talking link, means for effecting connection to the link, automatic selective switch mechanism for extending connection away from the link, an impulse sending device, and means operated responsive to effecting connection to the link for causing the impulse sending device to operate in predetermined manner to send a train of series of impulses to direct the oper ation of the automatic switch mechanism in corresponding manner in selectively extending connection away from the link whereby a talking connection may thereafter exist between two points via the link employed in temporary connection.

25. In a telephone system, a link circuit, an impulse sending mechanism companion to said circuit, a called line, switch mechanism for extending connection to said link circuit, automatic switch mechanism for extending connection away from said link circuit to said called line, means responsive to extending connection to the link circuit for causing the impulse sending mechanism to progressively operate in sending impulses to direct the operation of the switch mechanism, means whereby destroying the connection to the link circuit will thereby cause the impulse sending mechanism to restore from its progressed state of operation over a time interval, and means whereby the impulse sending mechanism will be disabled from again sending an impulse after its restoration is initiated until after it has become completely restored from its operated state, regardless of the fact that a new connection has been extended to the link circuitbefore said progressed operated state has been restored.

26. In a telephone system, a calling line, a plurality of selective switches, each said switch operated responsive to one or more impulses constituting a series applied thereto, the number of said impulses in each series determining the extent of selective operationof the switch operated thereby, an impulse series sending device on the calling line for send ng a train of series, means whereby respective series of impulses sent from the calling device will thereupon operate successive said switches to form a tandem operated switch train extension from the calling line, and means operated depending upon what train of series is sent from said sending device for sending a plurality of additional series from a point on the extension from the calling line to further link in tandem a plurality of said switches in the first said tandem operated switch train extension from the calling line.

27. In a telephone system, a calling line, a

plurality of selective switches, each said switch operated responsive to a plurality of impulses constituting a series applied thereto, the number of said impulses in each series determining the extent of selective operation of the switch operated thereby, an impulse series sending device on the calling line for sending a train of series, means whereby respective series of impulses sent from the calling device will thereupon operate successive 'said switches to form a tandem operated switch train extension from the calling line, and means operated depending upon what train of series is sent from said sending device for sending an additional series from a point on the extension from the calling line to further link in tandem one of said switches in first said tandem operated switch train extension from the calling line.

28. In a. telephone system, a calling'line, a called line, a first switch means, a call directing apparatus accessible from said switch means, a non-numerical switch, a numerical switch mechanism, a receiving line accessible from said numerical switch mechanism, means for operating first said switch means to connect the calling line to the call directing apparatus, means operated responsive to effecting last said connection for causing the non-numerical switch to connect :the call directing apparatus to the numerical switch mechanism, and means operated responsiy e to and dependent upon completing said connection to the numerical switch mechanism for causing the call directing apparatus to thereupon initiate its operation to directively operate the numerical switch mechanism to thereby complete connection from the calling line to the called line.

29. In a telephone system, a first called line, switch apparatus for extending connection to said called line, a second called line, automatic switch mechanism, a directing de- .vice, and means operated responsive to extending connection to said first called line for causing said directing device to operate to thereby direct said automatic switch mechanism to further extend said connection to said second called line.

30. In a telephone system, a calling line, a first called line, a second called line, automatic switch mechanism for extending connection to a desired one of said called lines responsive to directive control over the calling line, a directing device, and means operated responsive toextending connection to one of said called lines for causing the directing device to operate to thereby direct the operation of said automatic switch mechanism to further extend said connection to the other of said called lines.

31. In a telephone system, a calling line, a called line, a plurality of circuit links connected in tandem efieet-ing a talking connection from the calling line to the called line, sources I the lmpulse sending device if the connection" to the link circuit is broken down and a new;

ofcurrent for energizing the talking conductors of the calling line and a plurality of said circuit links in series, respectively, means controlled over the called line for reversing the current energizing the calling line and automatic switch mec anism over the link circuit and thereupon return to home position responsive to effecting connection to the link circuit by said switch means, and means for preventing imp-ulsesfrombeing sent from connection to the link circuit is substituted, until the impulse sending device has first returned to home position. I

33. In a telephone system, a link circuit, automatic switch mechanism, comprising non-numerical switch mechanism and nu-- merical switch mechanism for extending, con nection away from said link, switch means for connecting to said link, an impulse sending device operated from home position for sending a train of impulses to operate said numerical switch mechanism correspondingly over the link circuit, means for causing the non-numerical switch mechanism to connect the link circuit with the numerical switch mechanism responsive to efiecting connection to the link circuit, and means for initiating the operation of the impulse sending device only responsive to the non-numerical switchmechanism efi'ecting connection to the numerical switch mechanism.. Y

34. In a telephone system, a link circuit comprised of not to exceed two conductors,

automatic switch mechanism, consisting of non-numerical switch mechanism and nu merical swltch mechanism for extendmg connection away from said link, switch means for connecting to said link, an impulse sending device operated from home position for sendm a train of'impulses to operate said numerical switch mechanism correspondingly over the link circuit,'means for causing the non-numerical switch mechanism to connect the link circuit with the numerical switch mechanism responsive to efl'ecting connection to the link circuit, and means for initiating the operation of the impulse sending deviceonly responsive to the non-numerical switch mechanism effecting connection to the numerical switch mechanism. Y

35. In a telephone system, a link circuit comprised of notto exceed two conductors,

non-numerical switch mechanism and numerical switch mechanism for extending connection away from said link, means for initiating a call on the link circuit, an impulse sending device operated from home position for sending a train of impulses to operate said numerical switch mechanism correspondingly over the link circuit, means for causing the non-numerical switch mechanism to connect the link circuit with the numerical switch mechanism responsive to the initiation of the call, and means for initiating the operation of the impulse sending device only responsive to the non-numerical switch mechanism effecting connection to the numerical switch mechanism.

36. In a telephone system, a link circuit,

automatic switch mechanism,comprisingnonnumerical switch mechanism and numerical switch mechanism for extending connection away fromsaid link, means for initiating a 'callon the link circuit, an impulse sending device operated from home position for sending a train of impulses to operate said numerical switch mechanism correspondingly over the link circuit, means for causing the non-numerical'switch mechanism to connect the link circuit with the numerical switch mechanism responsive to the initiation of the call, and

meansgfor initiating the operation of the impulse'sendlng device only responsive to the non-numerical switch mechanism effecting automatic switch mechanism, comprising connection to the-numerical switch mechanism. I I a 37. In a telephone system, a link circuit,

' automatic switch mechanism, comprising non-numerical switch mechanism and nufm'erical switch mechanism-forfextending connection away from said lmk, means for initiating'a call on the link circuit, an impulse sending device operated from home position for sending a train of impulses to operate.

said numerical switch mechanism correpondingly over the link circuit, means for causing V the non-numerlcal swltch mechanlsm to con-- nect the link circuit with the numerical switch mechanism responsive to the initiafor initiating the operation of the impulse sending deviceyonlyresponsive to the nonnumerical switch mechanism efiecting con-' nection to the numerical switch mechanism.

38. In a telephone system, a circuit link, an impulse contact-set, a sending mechanism, 9. called line, switchtmechanism jfor extending connection to; said link, automatic switch from saidlink to the called line, means op ing said contact-set to be introduced into the tion of the call, and means operated over-i t a talkmg conductor of last said connection.

erated responsive toefi'ecting'connection to saidlink by said switch mechanism for causi I 12s mechanism for extending connect on away link and to directively operate the automatic switch mechanism under directive control of the sending mechanism by an annexed operation upon the completion of its said directive operation for excluding the contact-set from said link.

39. In a telephone system, a calling line, a circuit link having near and far sections, an open series contact (243) of one of the talking conductors of the near section, a. polar relay (233) having its winding in bridge of the talking conductors of the far section, a connector switch having front and back bridge sections for connecting the calling line to the link circuit, a source of current and a relay adapted to be operatively energized over the talking conductors of the respective said bridge sections, a called line, automatic switch mechanism for extending the connection from said link to the called line, an impulse sending contact-set (501), a sending mechanism, means (relay 203) operated responsive to extending the connection to said link for causing the contact-set to be introduced into the far section of the link to directively operate the automatic switch mechanism under directive control of the sending mechanism, means (relay 232) operated by an annexed operation of said sending mechanism upon the completion of its said directive operation for excluding the contact-set from said link and for energizing the polar relay in a first current direction, and means operated responsive to a response on the called line for reversing the direction of current energizing thepolar relay to thereby cause said open contact (243) to become closed for the purpose of operatively enengizing the back bridge relay to in turn reciprocate the relation of the front bridge section talking conductors with respect to the front bridge relay so that the source of current applied over the front bridge from its corresponding relay will be changed in direction with respect to the calling line subject to control over the called line.

40. In a telephone system, a line having not to exceed two conductors, an automatic switch for terminating the far end of said line, a second line accessible from said switch, an impulse sending device, and means operated over first said line for starting the impulse sending device sending impulses over the first said line, responsive to first said switch seizing said second line.

41. In a telephone system, a. line having not to exceed two conductors, an automatic switch for terminating the far end of said line, a second line and terminating automatic switch accessible at its near end from first said switch, an impulse sending device, and means operated over first said line for starting the impulse sending device sending impulses to operate the second said switch over the first said line and over said second line in tandem, responsive to first said switch seizing said second line.

42. In a telephone system, a line having not to exceed two conductors, an automatic switch for terminating the far end of said line, a second line accessible from first said switch, an impulse sending device, and means operated over a single conductor of first said line'for starting the impulse sending device sending impulses over the first said line, responsive to first said switch seizing said second line.

43. In a telephone system, a line having not to exceed two conductors, an automatic switch for terminating the far end of said line, a second line and terminating automatic switch accessible at its near end from first said switch, an impulse sending device, and means operated over a single conductor of first said line for starting the impulse sending device sending impulses to operate the second said switch over the first said line and over said second line in tandem, responsive to first said switch seizing said second line.

44. In a telephone system, a calling line, having not to exceed two conductors, an automatic non-numerical switch for terminating the far end of said line, a numerically positioned called line accessible via said switch, successive linking switches, an impulse sending device, and means operated over first said link for starting the operation of said impulse sending device in sending directive impulses constituting the numerical designation of the called line over first said line to operate certain of said linking switches, responsive to a predetermined operation of first said switch, in order to thereby link a connection from first said line to the called line.

45. In a telephone system, a line having not to exceed two conductors, an, automatic switch for terminating the far end of said line, a relay having its winding connected to a conductor of said line at the near end of the line, the winding short-circuited by a contact in said switch, means operated over the line for causing the switch to operate, whereby the short-circuit will be removed by said contact responsive to a predetermined condition of the switch ensuing by reason of its said operation, and a source of current for energizing the relay when the short -circuit is removed. I

46. In a telephone system, a line having not to exceed two conductors, a contact at the far end of the line, a relay having its winding connected to a conductor of said line at the near end of the line, the winding short-circuited by said contact, a second line, means operated over first said line for causing first said line to become operatively connected with said second line, means for removing said short-circuit responsive to the said connection being eflt'ected, and a source of current for energizing said relay when the shortcircuit is removed.

47. In a telephone system, a line having not to exceed two conductors, a contact at the far end of the line, a relay having its winding connected to a conductor of said line at the near end of the line, the winding short-circuited by said contact, a second line, means operated over first said line for causing first said line to become opcratively connected with said second line, means for removing said short-circuit responsive to the said conneclion being clfected, a source of current for energizing said relay when the shortcircuit is removed, and an impulse sending device at the near end of first said line which Will start sending impulses over said lines in tandem responsive to the relay operating.

48. In a telephone system, a subscribers line, having not to exceed two conductors, a called line, trunk line and terminating directly operated switch for linking a connection from the subscribers line to the called line, an impulse sending device, subscriber operated means controlled over the subscribcrs line for causing the subscribers line to become connected to the trunk line, and switch operated means revertively operated over the subscribers line responsive to the connection from the subscribers line to the trunk line becoming efi'ected for starting the operation of the impulse sending device to send impulses over a subscribers line and the trunk line to operate the said terminating switch by way of effecting a connection from the subscribers line to the called line.

49. In a telephone system, a trunk link, switch means for extending connection to the trunk link, automatic switch mechanism for extending connection away from the trunk link, an impulse sending device, means for connecting the impulse sending device to a talking conductor of the trunk link and for causing it to send a plura f, of impulses to directly operate said e=-Lomatic switch mechanism to extend connection from the trunk link responsive to extending connection to the trunk link, and automatic means rendered effective by the sending device to disconnect the sending device from the trunk link.

50. In a telephone system, a trunk link, switch means for extending connection to the trunk link, automatic switch mechanism for extending connection away from the trunk link, an impulse sending device, an impulse contact of the impulse sending device, means for introducing the sending contact in a series path with a conductor of the trunk link and for causing it to thereafter momentarily open the series path to thereby operate said automatic switch mechanism responsive to extending connection to the trunk link, and automatic means thereafter rendered effective by the operation of the sending device toexclude the sending contact from the series path. V

51. In a telephone system, a trunk link, switch means for extending connection to the trunk link, automatic switch mechanism for extending connection away from the trunk link, an impulse sending device, an impulse contact of the impulse sending device, means for introducing the sending contact in a series path with two talking conductors of the trunk link and for causing it to thereafter momentarily open the series path to thereby operate said automatic switch mechanism responsive to extending connection to the trunk link, and automatic means thereafter rendered effective by the operation of the sending device to exclude the sending contact from the series path.

52. In a telephone system, a link circuit divided into near and far sections, switch means for extending connection to the near section of the link, automatic switch mechanism forextending connection away from the far section of the link, an impulse sending device, means for connecting the impulse sending device to the far section of the link and for causing it to direetively operate said switch mechanism to extend connection away from the far section responsive to extending connection to the near section, and automatic means rendered eflYective by the operation of the sending-device to disconnect the impulse sending device and to connect the sections in tandem.

53. In a telephone system, a link circuit divided into near and far sections, the far section having not to exceed two conductors, switch means for extending connection to the near section of the link, automatic switch mechanism for extending connection away from the far section of the link, an impulse sending device, means for connecting the impulse sending device to the far section of the link and for causing it to directively operate said switch mechanism to extend" connection away from the far section responsive to extending connection to the near section, and automatic means rendered effective by the operation of the sending device'to disconnect the impulse sending device and to connect the sections in tandem.

54. In a telephone system, a link circuit divided into near and far sections, switch means for extending connection to the near section of the link, automatic switch mechanism for extending connection away from the far section of the link, an impulse sending device, means for connecting the impulse sending device to the far section of the link and for causin it to directively operate said switch mechanism to extend connection away from the far section responsive to extending connection to the near section, automatic means rendered efiective by the operation of the sending device to disconnect the impulse tandem, and means whereby when the switch means is disconnected from the near section the link. circuit will become dividedinto. its sections. 1 55. In a telephone-system, a' link circuit divided into near and 1 far sections, switch means for extending connection to the near section ofthe link, an impulse sending de-v vice, means for connectin the impulse sending device to the far section of the link-and: forv causing it tosend impulses over the far section responsive to extending ,oonnectionj t0 the near section,v and automatic means ren-,

dered eflective by the operation of the sending device only after the impulses have'been sent to disconnect the impulse sendingde vice and to connect the sections in tandem.

56. In a telephone system, a link circuit divided into near and far sections, switch means for extending connection to the near section of the link, an impulse sending de-f vice, means for connecting the impulse sending device to the far sect on of the link and for causingit to send impulses over the far section responsive to extending connection to the near section, and means for delaying the sending of the impulses dependent upon a specific condition ensuin upon the far section following the connectlon to thenear section, for starting the sending. i

57. In a telephone system, a link circuit divided into 'near and far sections, switch means for extending connection to the near section of the link, an impulse sending .device, means forconnectin the impulse sending device to the far sectlon of the link and for causing it to send impulses over the far section responsive to extending connectionto the near section and means for delaying the vertive control therefor applied over the far therefor applied over a single conductor. of

mg. 7 t v 60. In a telephone system, a telephone line having not ito exceed tWO, conductors for a portion of the length of the line, an impulse sending device, means for connecting the impulse sending device to the line to send atrain of series of impulses over said portion bf-the line, and means for delaying the sending of the firstimpulse of the tram depending upon" revertiv'e controltherefor applied overv asingleconductor' of said portion of the line, for starting the-sending.

61. Ina telephonesy'stem, atelephone line having "not to exceed t'wo 'co-nductors for a portion of the length oftlieline, an impulse sending device,means for connecting the impulse sending device. to-the line'to send a train of series of impulses over said portion ofthe line, "and means for delaying the sending of the first impulse of the tram depending. upon revertive control therefor applied oversaid'portionv of the line, for starting the sending. I I y In witness whereof, my name this 17th da HERBERI ,I hereunto subscribe of Au st, 1927. =M. F IENDLY.

- sending of the impulses dependent upon resection responsive to'the connection of the imp'ulse' sending device to the far section, for startin the sending. f

58. n a telephone system, a linkcircult having not to exceed two conductors for 'a portion of the length of the link, switch means for extending connection to: the link, an impulse sending device, means for con-' necting the impulse sendin device to the linkfto send impulses over said portion of the link responsive to extendingconnection to the link, and means for delaying the sending of the impulses depending upon revertive control therefor applied over said portion of the link, for starting the sending.

.59. In a telephone system, a telephone line having not to exceed two conductorsfor a portion of the length'of the line, an impulse. sending device, means for connecting the impulse sending device to the line to send im? pulses over said portion of the line, and means for delaying the sending of the im-' pulses depending upon revertive control said portion of the line, for starting the send-

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