US1894090A - Toll telephone switching apparatus - Google Patents

Description

10, 1933. H. M. FRIENDLY ET AL 1,894,090

TOLL TELEPHONE SWITCHING APPARATUS Original Filed June 11, 1915 4 Sheets-Sheet l Win 5555: [NI/[#7093 Thaw. i I Miami/(3M 1933. H. M. FRIENDLY ET AL 1,894,090

TOLL TELEPHONE SWITCHING APPARATUS Original Filed June 11, 1915 4 Sheets-sheet 2 Jan. 1933. H. M. FRIENDLY ET AL 1,394,090

TOLL TELEPHONE SWITCHING APPARATUS Original Filed June 11, 1915 4 shag-sheet 5 Jan. 10, 1933. H. M. FRIENDLY ET AL TOLL TELEPHONE SWITCHING APPARATUS Original Filed June 11, 1915 4 sheets sheet 4 Patented Jan. 10, 1933 UNITED STATES PATENT OFFICE HERBERT M. FRIENDLY AND ABCHIBALD E. BURNS, OF PORTLAND, OREGON; SAID BURNS ASSIGNOR T0 SAID FRIENDLY, MILTON S. FRIENDLY, AND CENTRAL REPUBLIC BANK AND TRUST COMPANY, EXECUTORS OF SAID HERBERT I.

FRIENDLY, DECEASED TOLL TELEDHONE SWITCHING APPARATUS Application flled June 11, 1915, Serial No. 531,810. Renewed January 23, 1938.

A feature of this invention relates to the means and methods whereby an operator, hereinafter for convenience to be designated as the manual toll operator at a remote station, hereinafter to be designated, for convenience, as the manual exchange, may secure a connection over a tool line with a subscriber in an exchange of the well known auto matic type, hereinafter to be designated, for convenience as the automatic exchange, by the operation of apparatus under the control of the operator, and the operator may signal the called subscriber by the well known method of ringing, and may release the connection at will, all without the agency or assistance of any person at the automatic exchange or associated toll board.

Further, a feature of this inventon relates to the display of signals at the toll switchboard associated with the automatic exchange, and which for convenience will hereinafter be designated as the automatic toll board, whereby the operators at said tool switchboard may be apprised of the fact that a remote operator is securing connection with a local subscriber in the automatic exchange proper b the use of the means hereinafter to be descri ed.

Further, a feature of this invention relates to the use of a recording device of the well known tape or other type whereby there is indicated or recorded information as to the number of the called line, time of day, duration of conversation, and other details as desired.

Further, a feature of this invention relates to means and methods whereby an operator at the toll switchboard associated with the automatic exchange, said operator hereinafter for convenience to be designated as the automatic toll operator, may by means under said operators control secure connection with a subscribers line in the manual exchange directly through the agency of the operator at the B board in the manual exchange, but without the agenc or assistance of any one at the manual to 1 board associated with the manual exchange. Said B board and its functions are well known in the art and need not be described.

Further, a feature of this invention relates to the display of signals at the manual toll board to indicate to the manual toll operators the fact that a telephonic connection is being made to a subscribers line, or such a service is underway, with the toll line, through the B board. Further, a feature of this invention relates to the use of means whereby the springjacks of the manual toll board, which are normally associated with the toll line, are disconnected therefrom as soon as the automatic toll operator has started the operation of securing a connection through the B board.

Further, a feature of this invention relates to means and methods whereb an operator at a station situated on the toll line somewhere between the manual exchange and the auto matic exchange, and which for convenience will be designated as the intermediate toll station may secure connection with a subscribers line in the automatic exchange by the use of means similar to that employed by the manual tool operator in doing likewise. Simultaneously the portion of the toll line leading to the automatic exchan e may be disconnected from that portion 0 the toll line from the intermediate station to the manual exchange.

Further, a feature of this invention relates to the means and method whereby the intermediate toll operator may secure connection with a subscribers line in the manual exchange through the B board in a manner similar to that previously outlined, whereby the automatic toll operator secured connection with a local subscribers line in the manual exchange through the B board. Simultaneously, that portion of the toll line from the intermediate station to the manual exchange may be disconnected from that portion of the toll line from the intermediate station to the automatic exchange.

Further, a feature of this invention is that a connection may be made from the intermediate station to a subscribers line in the manual exchange through the B board simultaneously with a connection with the intermediate station to the subscribers line in the automatic exchange, by the means protion of a cor vided for automatically calling from the intermediate station, neither operation nor the attendant telephonic service interfering with the other.

Further, a feature of this invention relates to means whereb signals on the toll line are caused to be displayed at signal devices thereon by any of the well known means of projectin current to actuate such devices, incident ly causingthe signals to display at the intermediate toll boar 5.

One si nal device displays constantly until released y the insertion of a switching plug in the associated springjack, while the other displa s with each signal impulse applied, thus t e latter enables the operator to ascertain what code signal is being transmitted over the toll line.

Further, a feature of this invention relates to the means rovided and methods of operacircuit for use in a manual toll board and in the intermediate toll board wherein one side of the circuit or otherwise the circuits directly associated with one of the plugs of the pair provides means for connecting with a local subscribers line, while the other side provides means whereby connection may be had with the toll line.

Further, a feature of this invention provides means for ringing or signaling on the toll line in the well known usual manner, irrespective of auxiliary equipments or methods of operation other than those well known in the art.

Further, a feature of this invention provides means for connecting at will a calling device of the well known automatic type with the toll line in the proper manner to actuate the apparatus at the automatic exchange to secure connection with a local subscribers line.

Further, a feature of this invention provides means for transmitting the proper impulses on the toll line to actuate the apparatus at the automatic exchange to ring or signal on the called subscribers line in the well known and usual manner.

Further, a feature of this invention relates to the employment in the circuits of the well known telephonic apparatus, known as a repeating coil, intermediate between the toll line and the apparatus connected thereto in the above mentioned relation for the purposes of preventing an unbalancing of the toll line in the usually accepted telephonic sense. This is in order to prevent such reaction of the apparatus on the toll line as to render it more or less noisy to the detriment of telephonic transmission.

Further, a feature of this invention is that the toll line may be used for the purpose of signaling and for transmitting telephonic communication in the manner commonly in use and well known in the art, the addition of this apparatus not interfering with such common usage.

Further, a feature of this invention relates to the means whereby grounded ringing or $1 allng current and other abnormal electrical conditions commonly met with in practice are revented from interfering with the pro or unctioning of any of the apparatus.

T ere are many other features and details of the circuits and apparatus, and the operating of same, that have not been specificall mentioned hereinbefore. Some of these wi 1 be mentioned or referred to hereinafter; also there are many other modifications subordinate to our invention that will occur to those skilled in the art to which our invention belongs. These modifications may be readily made and adapted to the various practical uses to which such equipment is a plicable. Therefore, this invention is not limited to the particular arrangements of circuits shown, but it has a wide application through modification and amplification without departing from its scope. The various conditions of terminal, exchange and other apparatus and the methods of operation and traflic will necessarily require modifications and adaptation. The drawings hereto attached and the descriptions of same show one organization of circuits and apparatus for accomplishing results under one particular set of conditions and are simply used as illustrative of our invention.

In the drawings:

Figure l is a circuit diagram of apparatus at the manual exchange.

Figure 2 is a circuit diagram of apparatus at the intermediate station.

Figure 3 is a circuit diagram of apparatus at the automatic exchange.

Figure 4 illustrates the line from the automatic toll board to the automatic exchange and to the automatic subscribers station.

Figure 5 is a circuit diagram of a cord circuit for use at the manual toll board and at the intermediate toll board for connecting with a subscribers line in the usual manner; also for connecting independent lines to the toli line in the usual manner commonly accomplished with cord switching pairs; also means whereby a calling device may be connected with the toll line in such manner as to make it possible to automatically select a subscribers line in the distant automatic exchange; also means for ringing or signaling the called subscriber.

Figure 6 is a diagrammatic representation of the toll line and associated equipment.

The illustrations used for equipment and apparatus in the above referred to drawings are diagrammatic and conventional and do not purport to represent structural details.

In Figure 6, A and B represent the terminals of a toll line at the manual exchange designated F1. C and D, and E and F, re-

spectively, represent the terminals of the sections of the toll line at the intermediate exchange or station designated F2. G and H represent the terminals of the toll line at the automatic exchange. I and J are the terminals of the associated springjack on the automatic toll board. K and L are the terminals of the first of the automatic selecting devices at the automatic exchange commonly known as a first selector, while M and N are the terminals of the subscribers line circuit at the last automatic selecting device in a five-digit automatic telephone exchange.

The automatic exchange is the well known type contemplated in U. S. patent to Keith, Erickson and Erickson, #815,321 granted March 13. 1906, and the U. Patent #815,176 granted to Keith, Erickson and Erickson, March 13, 1906. Specific automatic exchange embodiments of the said tpe are those installed by the Automatic lectric Company of Chicago, Illinois, at Portland, Oregon: Tacoma, WVashington, and Bellingham, \Vashington, during the years 1906 to 1908, and used over a period of years thereafter. This specific embodiment of automatic systems is known as the three-wire common battery automatic system.

In Figure 4, the springjack J20 and its terminals I and J, the automatic selecting device R35-R36, and the subscribers equipment S2, are shown diagrammatically in a somewhat fuller form than in Fig. 6.

The following are various conditions of service between the several stations and exchanges on the toll line, in the case chosen for description, the methods of operation of which will be hereafter described in detail:

a. Where the automatic toll operator executes a telephonic connection over the toll line to a subscribers line in the manual exchange through the B board at the latter exchange.

6. Where the manual toll operator executes a telephonic connection over the toll line to a subscribers line in the automatic exchange through the use of an automatic calling device at the manual toll board.

0. Where the intermediate toll operator executes a telephonic connection over the toll line to a subscribers telephone in the manual exchange through the B board at the latter exchange.

0!. Where the intermediate toll operator executes a telephonic connection over the toll line to the subscribers line by the use of an automatic calling device at the intermediate station.

e. Where any station on the line signals any other station on the line or executes a telephonic connection in the manner commonly used and well known in the art.

Referring to paragraph a: The automatic toll operator desiring to secure a connection through the B board, ascertains first that the line is not busy, by noticing that none of the multipled busy lamps e22, 623, e29, e32, e26 and 635, Fig. 3, are glowing, as would be the case if a plug as P2, Fig. 5, were inserted in any of the jacks J14, J15, J16, J17, J18 and J 19. The operator then inserts plug as P2, Fig. 5, in jack J16 or either of its multi- )lBS J14 and J15, and ascertains if the line is usy at any other station, by listenin in the usual manner. As a matter of fact, t 1e cord circuit used could differ from Fig. 5 in many respects, being a common form of toll to automatic cord circuit, for instance, but it is not an essential part of this invention considered alone, so the circuit shown in Fig. 5 answers all purposes of description and illustration. The line being found free, the operator inserts plug into ack J18, or either of its multiples J17 or J19. This completes a circuit from ground G5, Fig. 5, through contacts 180-181, contacts k17-k16; sleeve of plug; sleeve of jack, Fig. 3, through relay R29 to battery 133; also, a parallel or derived circuit from sleeve of jack through relay R34 to battery B3. Relay R29 operates, breaking contacts 152-153 and 155-156, disconnecting the toll line on terminals G and H from the apparatus for automatic calling (which will be described later), and connects it with the apparatus for calling and connecting through the B board at the manual exchange. Current now flows from main battery B3 through the windings of relays R32 and B31 in series; then divides through two paths in parallel, one path being through repeating coil winding C22-C21 through contacts 157-156 to terminal G of the toll line; over toll line conductor to terminal A, Fig. 1; through contacts 34-35; through contacts 11-12; through winding C6 of repeating coil. The other parallel or derived path is through repeating coil windings C23-C24; through contacts 154-153 to the terminal H of toll line; over toll line conductor to terminal B, Fig. 1; through contacts 37-38; through contacts 14-15; through winding C8 of repeating coil, where it unites with the current in the other branch: thence through relay R8; through contacts 50-49 to ground G1. This current actuates relays R31 and R32, Fig. 3, and relay R8, Fig. 1. Current flows from batter B3, through lamps e27, e30, 633 in parallel thence through contacts 159-158 to ground G3, glowing the lamps and indicating to the automatic toll operator that the B operator at the manual exchange, Fig. 1, is on the line.

Relay R8 bein operated, current flows from battery B1 t rough relay R3; through contacts 53-52 to ground G1, actuating relay R3, which disconnects the signal device D1 by opening contacts 19-20 and 21-22; opens the circuit of relay R2 by virtue of opening contacts 24-23; closes circuit from ound G1 through contacts 17-18-18; through lamps e2, e4, e6, 68, 810, all, all in multiple to battery B1, glowing them and thus indicating that the distant automatic toll opera tor is securing a connection through the B board. Relay R3 also closes a circuit from ground G1 through contacts 17-18, through contacts 3-4; through contacts 43-42; through lamp e2; through sounder S3 to battery B1, glowing the lamp e2 and thus apprising the B operator that a call is to be placed by way of her board, the sounder S3 attracting her attention audibly as well. A parallel or derived circuit is from round G1 through contacts 17-18; throu contacts 5151; through relay R6 to ttery B1. This actuates relay R6, which completes a talking circuit from the B operators telephone circuit S2 through contacts 44-45 and 46-47; through repeating coil windings C5 and C7 and the condenser 199. As the windin s C5-C7 are in inductive relation to win ings C6-C8, this allows the automatic toll operator to talk directly to the B operator over the line and re uest a connection with the desired subscri ers line in the manual exchange.

The talking connection at the automatic toll board may be traced from the springjacks J17, J18 or J19 through contacts 154-453 and 157-156 to line terminals G and H. Returning to Fig. 1, the B operator inserts plug P1 in a subscribers 1 no jack J 7 (or an intermediate trunking jack). Current then flows from battery B1 through relay R9 to sleeve of jack; through sleeve of plug. through relay R7 to ground G1. This actuates relay RT and thereby disconnects the ground G1 from contact 50 and the upper terminal of relay R8, however, leaving relay R8 grounded through the resistance T1. Current now flows from ground G1 through contacts 49-48; through contacts 7-6; through lamp e1; through the sounder S3 to battery B1, causing the latter lamp to also glow. Contacts 51-51 break, opening the circuit of relay R6, allowing it to return to its normal position and thereby disconnect the B operators telephone connections on contacts 44-45 and 46-47. The extra resistance T1 in the circuit decreases the current to a point where relay R32, Fig. 3, returns to normal position and thereby closes a circuit from ground G3 (by way of contacts 158-159) through contacts 160-161; through lamps e28, 031 and e34 in parallel to battery B3, causing these lamps to glow and thus indicating to the automatic toll operator that the B operaor has inserted the plug in the called suhscribers line (or the intermediate trunk to that line). The B operator depresses the ring'ng key associated with the plug. or otherwise signals the subscriber at the proper intervals, breaking contacts 103-702 and k4 k5, and making contacts Isl-k2 and fro-k6, which serves to connect the signaling current source, Z1, with the subscribers line through plug P1 and jack J7. This causes the subscribers signal device to operate, and u on his removing the receiver from switch hook in responding closes the line circuit for direct current through his telephone set. The ringing key being released to normal position, current flows from battery B1 through the lower winding 9f relay R5; through repeating coil winding- C7; through contacts [ail-k2; throng tip of plug; through enga ing tip spring of jack; through subscribersTine and set back through the sleeve of jack; sleeve of lug; contacts k4-k5; through repeating coi wind'ng C5; through the upper winding of relay R5 to ground G]. This current passage actuates relay R5. The resistance T1 is again shunted out by ground through contacts 40-39 of relay R5, which will cause the current to be augmented along the main line circuit to its original value, caus ng relay R32 to again actuate, incidentally opening its contacts 160-161, thereby extinguishing lamps e28, 031, e34, indicating to the operator at the automatic toll board the fact that the subscriber has answered. Current also flows from battery B1 throu h soundel S3; through lamp ,e2'; throng contacts 42-41; through relay R1; through contacts 48-49 to ground G1, causing relay R1 to operate. The lam 61' is extinguished by having its circuit roken through contacts 6-7. After telephonic service with the subscrlber has been completed and the subscriber has re laced his receiver on the ravity switch liook (or the equivalent), inci entally breaking the instrument circuit continuity, relay R5 is thus de-energized and returns to its normal pos'tion; contacts 39 and 40 are broken, removing the shunt from the resistance T1, which latter condition causes the current along the line to be again reduced, causing relay R32, Fig. 3, to return to its normal position, also causing lamps e28, @231 and e34 to glow as previously described, informing the operator that the subscriber has replaced his receiver on the gravity hook in its normal position. Although contacts 41-42 are broken, relay R1 is not de-energized, as current now flows from ground G1 through contact 49-48 through relay R1; through contacts 1-4; through contacts 43-42; through lamp 22; through sounder S3 to battery B1. Resistance of rela R1 is such that current through lamp e2 is reduced below its glowing value. Thus the extinguished condition of lamp e2 when plug P1 is in springjack indicates that the called party has responded; this regardless of the glowing or non-glowing state of lamp 61'. The automatic toll operator upon observing the signal that the subscriber has hung up, as just described, removes the plug P2 from the jacks J17, J18 or J19, as the case may be. This disconnects the ground G1 from the sleeve of the jack, de-enelgizin relay R29, causing it to return to norma breaking contacts 153-154 and 156-157 (contacts of relay R are under control of rela R29), which breaks the current along the line as reviously traced. This de-cnergizes relav 28, Fig. 1, and causes it to return to normal position, breaking the circuit of relay R3 through contacts 52-53. Incidcntally busy lamps 02, e4, c6, 08, 010, and 012 are extinguished by the opening of contacts 17-18-18. Current now flows from ground G1 through contacts 17-16; through contacts 5-6; through lamp e l; through sounder S3, to battery B1, causing the lam 01 to glow. This is the disconnect signal or the B operator. The B operator then removes plug P1 from the S11)- scribers jack J7 or intermediate trunk jack as the case may e), whereupon all apparatus returns to normal position, as shown in the drawings.

Upon the automatic toll operator insertin plug described into one of jacks J 17 J18 or J19, and during the time it is so inserted incident to the telephonic service through the B board, the relay R8 is in its operated position, and its dependent relay R3 is also inits operated position; the latter relay cutting off signal device D1 by the openmgpf contacts 19-20 and 21-22; also opens circuit between the relay R2 and sleeve of acks J1, J2 and J3 at contacts 23-24, thus precluding the closing of contacts lO-lland 13-14 of relay R2, which would allow access to the line by the manual toll operator upon inserting a plug into one of the latter acks. This might disturb a telephonic service from the automatic toll board to the manual exchange through the B board. For the same reason contacts 25-26 open the conductor between relay R4 and sleeve of jacks J4, J5 and J6, likewise precluding the possibility of obtaining access to the line and incidentally cutting it 011 from the B board at contacts 34-35 and 37-38. However, if during the course of a service from the automatic toll board, for instance, to a manual subscriber through the B board, when plug as described is inserted into either of jacks J1. J2, J3. J4, J5 or J6, upon the automatic toll operator withdrawing the plug to terminate the service, relay R8 will return to its normal position in any event, opening current circuit to relay R3, causing it to return to its normal position, incidentally closing contacts 23-24 and 25-26. The former contacts close circuit of relay R2 to jacks J1, J2, and J3, and the latter contacts likewise close circuit of relay R4 to jacks J4, J5 and J6. In the first case line circuit is opened as regards relay R8 at contacts 11-12 and 14-15, and in the second case at contacts 3435 and 37-38, thus making it impossible for the automatic toll operator to obtain access to the B board if a plug is inserted in any of the jacks at the manual toll board. The manual toll operator can therefore restrict the automatic toll operator (or any other remote operator) as regards access to the B board and the former operator also is apprised oi each service through the B board made by a remote operator.

Referring to paragraph b: There are two ways in which an operator at the manual toll board, wishing to call a subscriber in the automatic exchange may do so. One is b means of a calling device d1, amociated wit one position and which may be connected with various lines by means of the key 193- 194-195, while the other is by means of the calling device such as d3 associated with the cord circuit shown in Fig. 5.

Taking up the first case: The operator at the manual toll board notes if multipled lamps 68, 610 or e12 are glowing. If they are, it would indicate that some other operg ator at that switchboard had a plug in the line springjack. If lamps (the one lamp before the operator would be the only one observed in practice) are not glowing, the operator would insert lug P2 in any one of jacks J4, J5 or J6. urrent will then flow from ground G5 throu h contacts 180-181; through contacts 7:17- 16 to the sleeve of the plug; to the sleeve of the jack; through contacts 25-26; through relay R4 to batter B1. This actuates relay R4 which throug its contacts disconnects the line terminals A and, B from the B switching apparatus previousl described by opening contacts 34-35 and 3 -38. Current will then flow from ground G1 through contacts 27-28; through lamps e1, e3, e5, e7 and e9 and e12 in multiple, causing them to glow and thus indicating to other operators that the line is in use from or to the manual toll board. The operator then manipulates the cord pair listening key in order to close the operators telephone circuit from terminal f1, through contacts 7022-7621; through repeating coil winding C28; through condenser C; through repgatin coil winding C27 through contacts 0- 19; to terminal f2. The telephonic currents in repeating co1l windin C28 and C27 act inductively to repeating c011 windings C25 and C26; thence through contacts k9- k8 and 7010-7011; through tip and ring of plug; through tip and ring of jack; through contacts 30-29 and 32-31; and through repeating coil windings C2 and C4. The telephonic currents act inductively to repeating coil windings C1 and C3; thence through contacts 33-34 and 36-37 to the line terminals A and B. Ascertaining by listening that no other station is using the line, the o erator prepares to call the desired number y manipulatin the dial on the automatic calling device. urrent will now flow from battery B1 throughresistance 192; through contacts 193-194, and then divides in parallel through the repeating coil winding Cl and C3; through contacts 33-34 and 36-37 to terminals A and B; over the toll line conductors in parallel to terminals G and H, Fig. 3; through contacts 153-152 and 156-155; through repeating coil windings C17 and C19; through the two windings of relay R26; through contacts 170-171; through contacts 172-173; to ground G3, actuating relay R26. Current will then flow from ground G3 through contacts 145-146; through lamp 624; to battery B3, causing the lamp to glow, indicating that a call is being made into the automatic exchange. Current also flows from ground G3 through contacts 145-146; through relay R23; to battery B3. This current actuates relay R23, breaking its contacts 12-122, which previous] shorted the automatic trunk conductors and J. The dog 131 is also left free to turn on its pivot 132 under tension of spring 129.

Returning to Fig. 1, the manual toll operator manipulates the calling device key making contacts 194-195 just before breaking contacts 194-193. Current still flows on the line as before, but now through the contacts of the calling device (11, through the resistance 7'2, to battery B1. The operator then calls the desired figures representing the subscribers number, by rotating the calling device dial in the manner common to automatic calling. This interrupts the current passing through its contacts into a series of la ses corresponding to the digit called. Relay 26, Fig. 3, returns to its normal position with each current interruption or lapse during the period of the lapse, and current flows from ground G3 through contacts 145-144; through contacts 136-137 through contacts 121-122 of relay R23, which latter relay remains actuated, due to its sluggish or retarded release characteristic; to line terminal J, leading to the so called vertical wire of a so called three-wire first selector of the Strowger type, the operation of which system is well own in the art. This connection is diagrammatically represented in Fig. 4. During the period of lapse while relay R26 is released to normal position, current flows from ground G3 through contacts 119-120; through contacts 147-148; through relay R27 to battery B3. This actuates relay R27, incidentally breaking contacts 150-151 and closes contacts 149-150. Current will then flow from ground G3 through contacts 150-149; through relay R22 to battery B3, actuating relay R22. This movement of relay R22 forces over the pawl arm 127 and the pawl 125 engages the first tooth of the ratchet wheel 130, stepping it up one notch. Ratchet wheel 130 is retained by pawl 131. In the comparatively long interval between the digits, relay R22 remains operated for a comparatively long time. Relay R27 returns to normal osition during this interval, followed within an appreciable period of time by relay R22. During the instant while relay R22 remains opcratcd, current flows from ground G3 through contacts 150-151; through contacts 116-115; through contacts 13-t-133; to line terminal I, leading to the so called rotary wire of the automatic switch as indicated diagrammatically in Fig. 4, thus giving the rotary impulse necessary in the so called three wire automatic central office switching mechanism of the type referred to. This same sequence of actions takes place with each digit called, the ratchet wheel 130 stepping up one notch following the last impulse constituting a digit. Each subscribers number is composed of a certain number of digits fixed by the capacity of the exchange; for example, it being five for a 10,000 line exchange. Supposing, for instance, the call called subscribers line is numbered 31009, the insulated pin 130' is adjusted to engage the spring 117' to make contacts 117-118 at the end of the fifth step, or on the completion of digit 9. After relay R22 has returned to normal, current flows from ground G3 through contacts 113-112; through contacts 117-118; through relay R24; to battery B3, actuating relay R24. Contacts 140-141 being made, ground is held on contact 117 as lon as ratchet wheel 130 remains in the fifth position, which is to say that relay R24 will remain operated throughout the remainder of the service. The operator then rings on the subscribers line, by calling one or more digits on the calling device d1, interrupting the line circuit correspondingly and allowing relay R26 to return to normal as described. Relay R27 and R22 operate as before. But now, in the instant when relay R27 has returned to normal position and relay R22 is in its actuated position, a circuit may be traced from the ground G3 through contacts 150-151; through contacts 116-115; through contacts 134-135; to terminal J, and on the vertical wire of the trunk to the automatic exchange, as shown in Fig. 4. This gives the vertical impulse necessary to ring a subscriber in a three wire automatic s stem. \Vhen the subscriber responds, an additional organization of relays well known in the art causes the current to flow over line conductors through terminal I; through relay R25; through contacts 114-115; through contacts 134-135; through terminal J to the vertical wire of the trunk to the automatic exchange. A path in multiple with the winding of relay R25 may be traced through repeating coil windings C20 and C18 in series. Current flows from ground G3 through contacts 142-143: through lamp e25, to cause it to glow, indicating to the operator at the automatic toll board that the subscriber has answered. The purpose of this lamp signal dethe automatic exchange, for it is not always 0 erator at the automatic tli tween'posts 197' and 19 which spring is to allow advisable to give an operator at a remote toll board unrestricted access to the automatic exchange. This is aside from enablin the toll board to know 0 busy or idle state of the line. Incidental to the actuation of relay R25 contact 144 applies ground to free pole of relay R30, causin it to actuate to prevent actuation of relay 29.

Armature of relay R26 is controlled by an adjustable tension springr the purpose of for regulation under varying line conditions, normal leakage, for instance.

The re ter or indicator R is 146 as relay R26 operates. a

A telephonic circuit was previously traced from the cord circuit, Fig. .5, through jacks J4, J5 or J6, Fig. 1, to the terminals A and B of the toll line. This circuit can now be com leted asfollows: through terminals G and Fig. 3, through contacts 153152 and 156 -155; through repeating coil windings C19 and C17; through contacts 138-139; inductivelyto the repeating coil windings C20 -C18 to terminal I of the automatic exchange trunk; and through contacts 114- 115 through contacts 134'135 to terminal J of. the aptomatic exchange. The remainder of thiijprrcuit to the subscriber is shown diacrram'inatically in Fig. 4, but need not be shown in detail, as the principles of the circuit are common knowledge to those versed in the art. g

Upon the termination of the service, the calling operator removes the plug from the jack and all apparatus in Fig. 1 returns to its normal position, and the current on the toll line conductors is broken. Relay R26, Fig. 3, then returns to normal. Relays R27 and R22 operate as usual. The current in relay R23 is broken by the opening of contacts 145-146. Relay R23 remains operated for an appreciable eriod, due to its retarded release characterlstic, but after the short period it returns to normal. This short circuits terminals I and J by means of contacts 122- 124. The current in relav R27 is interrupted b the breaking of contacts 119-420. Relay 27 then returns to normal followed after an appreciable interval by relay R22, giving a ground impulse on terminal I as previously described. Since terminals I and J are connected by a short circuit through contacts 122124, this gives the short and ground on both wires of the automatic exchange trunk which is necessary to release a call in the three wire Strowger system.

198 secured be.

during times of, ab-.

operated the impu ses transmitted by contacts 145 through relay R37 to ground When relay R23 returned to normal thedog 131 was disengaged from the ratchet wheel, which however was held by the pawl 125 as long as relay R22 was operated, but with the release of R22 pawl 125 is disengaged and the ratchet wheel 130 returns to its normal position by the tension of spl'in' 129. This frees the insulated pin 130 an allows contacts 117-118 to break. which in turn release relay R24. All apparatus is now restored to the normal condition, ready for an incoming or outgoing call of any descrintion.

Toll lines are all subject to accidental ground or to grounded ringing or signaling currents. The consequences to the apparatus by these contingencies is forestalled by controlling the apparatus by means of relay R28, which is connected in a brid e across the toll line through repeating coil windings C17 and. C19. Alternating signaling current accidentally a iplied or directedlv applied from plug P2 of ig. 3, for example, will actuate armature of relay R28 first in one direction and then in the other, breaking contacts 170- 171 and 172173 alternately. This in eflect disconnects battery from R26, preventing its operation or sustainment,

the center of relay the duration of the current being too brief to actuate it or sustain it if actuated.

Another method of automatic calling from the manual toll board to the automatic exchange is where an operator after ascertaining that the line is idle, as in the previous case, inserts a plug into any one of jacks J1, J2 or J3, Fig. 1, as P2, Pig. 5. Current then flows from ground G5 through con tacts 180181; through contact". k17-k16; through sleeve of plug and sleeve of jack; through contacts 2324; and through relay R2 to battery B1, actuating relay R2. Contact 8-'-9 is made which causes the busy lamps e1, e3, e5, e7, e9, and 011 to glow. as in the case previously described. The tclephonic circuit may now be traced from terminals A and B through contacts 34-35 and 37-418; through contacts 11-10 and 1413; through tip and ring springs of jack; through tip and ring conductors of plug P2, Fi .5; through contacts IcB-k9 and k11-k10; t rough repeating coil windings C25 and C26 in series; thence inductvely to repeating coil windings C27 and (728 to operators listening key and associated telephone circuits. After listening noon the line the operator manipulates the calling device key, thereby breaking its contacts law-M7 and 1015-7014, mak ng contact k14-k13. Relay B37 was heretofore short circuited by contacts 1017-41216. but now opcrates with current from the sleeve of plug G5. Current now flows from battery B5 through resistance 04; through contacts of calling device d3: through contacts k13-k14; to center C of repeating coil windings C25-C26, and thence to line as previously traced. The operations of callin and the calling a paratus are identical wit 1 those described or the calling device (Z1 and associated a paratus, however, \v'th the exception of met od of signaling.

When the calling device key is restored, after calling the five digits of the subscribcrs number, current flows from battery B5 through relay R38; through contacts 183- 182; through contacts k15--k14' to center of repeating coil C, and thence to line as previously traced. Relay R38 operates breaking contacts 184-185 and 186-187. To ring or signal the subscriber, the o erator depresses toll ringing key, thereby reakin its contacts 169-128 and 1010-4011, which Ereaks the current flow to the toll line, causing relay R26, Fi 3, to return to its normal osition as described in connection with ca mg device dl. Relay R38 is (lo-energized, but remains in its actuated position for an appreciable period of time due to its retarded release characteristic. ilpon relay R38 returning to its normal osition current is again restored to the to 1 line through contacts I:Tk8 and I011--Ic12; throu h contacts 17 5176 and 17 817 9; throng contacts 184185 and 186-487; through the windings r5 and r6 of retardation coil to battery B5. This action of relay R38 prevents the interruption of the current for a long enough interval of time to cause the disconnection of the automatic call which would otherwise take place if the operator held the ringing key depressed for too long period of time. When the ringing key is released, relay R38 actuates as before. It is not necessary to detail the operations of callin in the remainder of the operations, as this .is identical with those previously described for oil. Release is accomplished when plug P2 is removed from the spring'jack as previously described.

Referring to paragraph c: In case a, the action of all apparatus 1n Fig. 1 for an incoming call through the B board was fully explained, so it will not be necessary to describe 't again. For convenience, however,

of 01pto t e we will recapitulate the main points eration. Grounded batter applied toll line causes current to ow through relay R8, Fig. 1, and then through the agency of relay R8 connects the toll line with the B operators telephone circuits. When the B operator inserts plug P1 in a subscribers line (or intermediate trunk jack), extra resistance T1 is cut into the line circuit, reducing the current flow. When the called subscriber answers, the resistance T1 is shunted out, thus increasing the current to the former strength. That is, whenever the subscribers receiver is normally on the gravity hook, current is decreased and whenever the subscribers receiver is ofi the gravity hook, current is increased to the original value. With this in mind we may describe the action of Fig. 2. The intermediate operator,- after first ascertaining that bus lamp 017 is not glowing, plugs into jack 10 with plug P2 and listens in on the line to make certain that the line is not in use between other sta tions. If it is not in use the o erator changes the plug- P2 to jacr J8. urrent then flows from ground G5 on sleeve of plug P2 throu h sleeve of jack J8; through relay R14; to attery B2, actuating rela R14. Current then flows from battery B2 through relay R11; through relay R12; throu h repeating coil windin C10 and C12 in erivation to toll line; t ence, as reviously described, through relay R8, ig. 1,'which cuts the B operators set ofl of the line, as reviously described.

he subscribers line is alread connected as before and relays R11 and 12 operate the same as relays R31 and R32, Fig. 3, previously described. Current flows mm the battery B2 through lam 014; through contacts 59-58 to ground 2, causing lamp 014 to glow. When the B operator inserts P1 into a subscribers line (or an intermediate trunk jack), the decrease in current previously noted allows relay R12 to return to its normal osition. Current then flows from battery 2 through lamp e13, glowing it; through contacts 61 0; through contacts 5958, to ground G2. The glowing lamp, e13, indicates to the o erator at the intermediate toll board the act that the B operator has the plug P1 in a subscribers jack and is probably ringing the subscriber, in the usual course. When the subscriber responds, as by removing his telephone from t e gravity hook, the increase in current before noted causes relay R12 to again actuate, extinguishing lamp e13. Upon completion of the service the lamp e13 again glows, as subscriber replaces his telephone on the gravity book. The intermediate operator then withdraws plug P2 from the springjack an all apparatus restores to its normal position as shown in the drawings.

Referring to paragraph d: There are two methods by which the intermediate operator may call automatically into the automatic exchange. One is by the use (1) of a calling deviced2 associated with jacks J11 and J13, 2, while the other (2) is by the use of a calling device (13 and cord circuit Fig 5 in connection with jack J8 or jack J9, ig. 2. In case (1) the operator first ascertains that lamps e15 or 617 are not lowing, and then inserts plug P2 into jac J10 or J13 and listens in on the line to make certain the line is not in use between other stations. If it is not in use, the operator inserts plug P2 into jack J11. Current then flows from grounded sleeve of plug previously described through sleeve of jack; through relay R15; to battery B2, actuating relay R15. Current from battery B2 reaches ground G2 through contacts 79-78; through lamps e16 and e18 in multiple, causing them to glow as a busy signal. Current from battery B2 also reaches the grounded sleeve of the jack through contacts 9394; through contacts 91-90; through relay R17; through relay R16 to battery 152, causing relays R17 and R16 to operate. A

circuit may now be traced from battery B2 through resistance r3; through contacts of calling device (12; through contacts 8889 to center of seriesed repeating coil windings C13 and C15; thence in parallel through contacts 8081 and 8384; through contacts 6263 and 65-66, to toll line by way of its terminals E and F thence to terminals G and H of the apparatus set at the automatic exchange. Current flowing in this path actuates relay R26, Fig. 3, in the same manner as previously described in case b. The remainder of the calling operations are identical with that in case b, describing the action of the calling device d1, Fig. 1, and need not be again described except that the method of ringing the subscriber is different. To accomplish this the operator depresses ringing key, Fig. 5, breaking contacts k9k8, la10k11. Alternating current or other current now flows to ground G5 from generator Z1 through contacts 177 178; through contacts fulfil-4011; through ring contact of jack J11; through relay R15; through tip of Jack J11; througlrtip of plug P2; through contacts k87c7; through contacts 17 5-174, to ground G5. This causes the armature of relay R18 to vibrate, opening contacts 93-94 and 90-91, alternately, or in conformance with current derived from generator Z1. This interrupts the current through relays R17 and R16 for the greater part of the time of each application of current upon depressing the ringing key. The only time current flows on the line is while the armature is passing the neutral or normal position, which is for such a small interval of time as to be negligible so far as pro ducing an effective tractive eifort on an associated relay. This allows relays R17 and R16 to return to normal, but as R16 has a retarded release characteristic there will be an instance during which contacts 88-89 are broken before contacts 86-87 are made. This action interrupts the current in the main line circuit as previously traced through calling device J2, and which causes relay R26, Fig. 3, to return to normal position for an appreciable period in the same manner as described in case d and rings the automatic subscriber after actuating again. Other details being identical with the previous description, they will be omitted. Upon completion of service, the plug is removed and all apparatus restores to normal position, the automatic subscriber being released as before.

The other method (2) of calling is by means of the calling device d3 and cord circuit, Fig. 5, in connection with jack J9 Fig. 2.

The intermediate operator notes that the busy lamps e16 and e17 and e21 are not glowing and then plugs in to jack J10 and listens as before to ascertain if the line is busy, and then inserts plug P2 into jack J9. Current flows from the sleeve of the plug grounded as previously described in case I), through the sleeve of jack; through relay R13, to battery B2, operating relay R13. The toll line is opened by the breaking of contacts 62 -63 and 6566 and that portion of the line towards the automatic exchange is connected with the tip and sleeve contacts of jack J9; through contacts 6364 and 66-67. The busy lamps e16 and e18 are caused to glow by the closing of contacts 6869. The operations of selecting the subscribers line in the automatic exchange with calling device 033, and the subsequent actions of relays R37 and R38, have been fully described before under second action of case b, and need not be repeated, as the actions are similar.

Upon the called subscriber in the automatic exchange responding, relay R25 will be actuated by current projected back along the trunk between the automatic exchange and the automatic toll board. Contact 144' will thus be grounded to G3 through contacts 144-143142. This will actuate blocking relay R30, the companion relay to relay R29, precluding access to the line through jacks J17, J18 and J19, incidentally cutting telephonic circuit at contacts 152-453 and 155- 156. It also actuates relay R33, which disconnects signal device D4 and causes lamps e22, e23, 626, e29, e32 and e35 to glow. Contacts 143144 will obtain ground G3 and cause lamp 625 to low, indicating the response of the subscriber and the fact service 15 under way. The lamp e24 under control of relay R26 will glow by reason of circuit established to ground G3 through contacts 145 146. Relay R26 remains operated as long as a remote operator has access to the automatic exchange, excepting during the lapses of current while an automatic calling device is being operated to select a subscribers line in the automatic exchange or while relay R28 is caused to actuate as hereinbefore set forth. During the said brief lapses the lamp e24 will extinguish, but as the duration of the lapses is brief, the lamps appear as glowing constantly, but with a flicker. This flickering is an advantage, since it allows the operator at the automatic toll board to know what is takin place.

Re erring to paragraph e: There remains besides the special features described in the preceding cases, the case where the difi'erent stations si al and talk over the toll line by the metho s more commonly used in present day practice. Most of these methods and the apparatus for carryingxtahem out are well known in the art and will merely. outlined in this description, but some novelties will be noted.

(1) Automatic toll operator callin the manual toll board. The automatic to operator will note condition of busy lam s and if line is free, inserts plug P2 into jac J14, J 15 or J 16. Current will then flow through relay R30 to grounded sleeve of jack energizing said relay R30 and by superior attraction insures that its companion relay R29 will not operate it a plug should be inadvertently inserted in jacks J17, J18 or J19. Relay R33 also actuates, and by breaking contacts 167-166 and 165-164 disconnects the line signal D4; also closes contacts 163-162 and glows busy signals e22, e23, e26, e29, e32 and 635, indicating to the other operators that the line is busy by reason of a call to or from the automatic toll board. Dipressing the ringing key closes the circuit mm the toll line through contacts 107-108 and lull-I012 through contacts 175-174 and 178-177 to ringin generator Z1. At the manual toll board t is actuates and displays line signal device D1, which the operator at the manual toll board responds to by plugging into jack J3 (or J1 or J2). Subsequent operations follow common practice.

(2) The automatic station signaling the intermediate station. Operations are identical with the above at the automatic toll board. Rin 'ng current coming in over toll line throug contacts 63-62 and 66-65; through contacts 81-82 and 84-85; through contacts 108-109 and 110-111; throu h relay R19, causing its armature to vi rate. In whichever direction it operates it closes a circuit including contacts 102-103 and through contacts 104-105; through lamps e20 and e19, causing them to glow; and also closes a circuit through relay R20 causing it to operate. Relay R20 locks in the actuated position through its contacts 101-102 and contacts 104-105 of relay R21, causin lamp 620, which is in multiple with relay 20, to continue glowing. At the end of the signaling impulse, contacts 97-98 and 9394' are left open which extinguishes lamp e19. With each succeeding signaling impulse, however, lamp e19 glows in unison with the impulse as long as applied, one set of contacts 97-98 and 93'-94' being closed practically all of the time while the armature of relay R19 is vibratin under signaling current application. en the mtermediate operator inserts dplug P2 in jack J13, relay R21 is energize by current in the circuit traced from grounded sleeve of cord through sleeve of jack; through relay R21, to battery B2. Si al relay R19 is dlsconnected from the toll ine by the opening of contacts 110- 111 and 108-109. Relay R20 is de-energized by the opening of contacts 104-105 and it returns to normal position, incidentall y breaking contacts 101-102 and lamp e20 1s e rtm ished. Contacts 106-107 close, causin amps 621 and e17 to glow. The inte1 me iate toll operator answers h manipulatmg listening key of cord circuit ig. 5, etc., etc. Subsequent operations follow common practice.

(3) Intermediate toll operator calling automatlc toll board or manual toll board without cutting line. The intermediate operator inserts plug P2 in jack J10 or J13 as in answering a call (2) with same action of apparatus. The operator then depresses the r ng ng key as in the operation in (2). The ringing current flows to the toll line by circuit path previously traced; through normal path in Fig. 3 previously traced; to tip and ring conductors of jack J16; through contacts 166-167 and 164-465; to line signal device D4, operatin it and causing the signal device to display. he operator at the automatic toll board answers b inserting plug P2 in jack J16 (or J15 or 14). Relay R33 operates with current in circuit from rounded sleeve of plug; through sleeve of ack throu h relay R33 to battery, B3. Signal evice 4 is disconnected from the line by opening of contacts 166-167 and 164- 165. Bus lam s e22, e23 and 626 are caused to glow t roug contacts 162-163 closing. Subsequent operations follow common practice.

(4) A portion of the rin ing current from the intermediate toll boar also find a path as previously described through contacts 34- 35 and 37-38; through contacts 11-12 and 14-45; through contacts 20-19 and 2221; to line signal device D1, energizing it and causing it to display. The manual toll operator responds by inserting plug P2 in jack J3. Current flows in a circuit from the rounded sleeve of plug through sleeve of ack; through contacts 23-24; through relay R2, which actuates, disconnecting all the B switching apparatus from the line by the opening of contacts 11-12 and 14-15, likewise disconnecting the signal D1 which was connected behin contacts 11-12 and 14-15. A telephonic circuit is formed from the ti and ring conductors of jack J3 throug contacts 10-11 and 13-14; through path previously traced to line. Subsequent operations follow common practice.

(5) O erator at intermediate toll board calling t e automatic toll board, cutting the toll line at intermediate station; The operator inserts plug P2 in jack J9. Current in circuit from grounded sleeve of plug; through sleeve of jack; through rela R13 to battery B2, actuates relay R13. T e toll line is opened by the openin of contacts 62-63 and 65-66. The tip an rin of jack J9 are connected with that portion o the toll line toward the automatic exchange through contacts 63-454 and 66-67. The busy lamps e16 and e18 are caused to glow by closing of contacts 6869. Subsequent operations are the same as described in (2).

(6) Operator at the manual toll board calling either automatic toll board or intermediate toll board. The operator at the manual toll board inserts plug P2, Fig. 5, in jack J1, J2 or J3, Fig. 1. Current flows in circuit from grounded sleeve of plug; through sleeve of jack; throu h relay R2, as described under paragraph (4 Signaling is accomplished by means of ringing key, Fig. 5, as in other cases previously described. Subsequent operations of answering at automatic toll board or intermediate toll board are the same as described under paragraph (1) and paragraph (4), and need not be described again.

A plurality of springjacks is shown in a each of Figs. 1, 2 and 3. In each case the upper row of springjacks are auxiliary s ringjacks, and which may be dis osed on the switchboard sections remote rom the position on which the lower springjacks are located to allow access to the line by any of a number of operators. Obviously, more springjacks may be disposed in multiple relation than shown in the drawings, or all may be omitted without departing from the scope of this invention.

In the foregoing specifications mention has been made of o erating currents passing over the line in para lel. These currents are superposed upon the telephonic currents during sound transmission. It is not necessar to the proper operation or manipulations o the various relays controlling circuit relations that the derived or parallel current flow shall take place. A current applied over only one limb of the line through proper adaptations will answer necessary conditions. The adaptations may be the well known means of deriving a telegraphic circuit from a sin le limb of a two-limb telephone line. T is adaptation is in the parlance of the art of telephony and telegraphy is termed a composite circuit as distinguished from a simplexed circuit wherein both limbs of the line are used in parallel as specifically set forth. Of course, in the present adaptation to automatic telephony the signals transmitted operate electromagnetic devices which in turn control the movement of automatic switches, while in the well known use referred to, the signals transmitted operate a means for operatmg corresponding electromagnetic devices, the object-of which is to produce intelligible manifestations.

In the specifications and drawings lamp signal devices and electromagnetic signal devices have been referred to. Among the many possible changes and adaptations in the circuits and apparatus, other forms of signal devices may be substituted, or these may be modified; all of which changes are subordinate to our invention.

The term ringing as used herein denotes any means for signaling as applying current of any nature through any means to actuate ada ted signal devices.

aving thus described our invention, what we claim as new, and desire to secure by United States Letters Patent, is

1. The combination of a. subscribers line in connection with an automatic exchange, a trunk to a toll board, a toll line from said toll board extending to a remote toll board, control means at said remote toll board the agency of which is to gain connection with the said subscribers line, a signal device on first said toll board that will display upon manipulations of said means on said remote toll board being made to gain connection with said subscribers line, and a second si nal device on first said toll board that wi 1 display in conformance with the response on the said subsc'ribers line.

2. The combination of an automatic exchange, a trunk line to a toll board, a toll line extending to a remote toll board, a remote toll board, said remote toll board adapted to select a subscribers line in said automatic exchange, signal devices on first said toll board that will display upon the operator at said remote toll board manipulating its means for selecting asubscribers line in said automatic exchange, a signal device on first said toll board that will display during the duration of the service between said remote toll board and said subscribers line. and a second signal device on first said toll board that will display in conformance with the responded or nonresponded condition of the selected subscribers line.

3. In a trunk circuit, a repeating coil having its winding interposed in the talking conductors of said circuit, a relay interposed between the windings on one side of said reeating coil, a source of current for operating said relay, a su ervisory relay and signal controlled therel iy, and a resistance for alternating the condition of said signal, controlled by the interposed relay.

4. In a trunk circuit, a re eating coil having its windin s interposed in the talking conductors of t e trunk circuit, a relay and source of current serially connected between the center terminals of one pair of the repeating coil windings, a supervisory relay and signal controlled thereby, and a resistance for alternating said signal controlled by the first said relay.

5. In a telephone system, a trunk line leading from a manual switchboard to an automatic exchange, automatic apparatus for connecting with telephone lines at the automatic exchange, an operators cord circuit for connection with the trunk circuit at the manual switchboard, means for applying ringin current from the cord circuit to the trunk inc, a relay connected to the trunk line responsive to and ringing current, and relay mechanism in the automatic apparatus responsive to the trunk relay for applying ringing current to a connected automatic line.

6. In a telephone system, a trunk line extending from a manual switchboard to an automatic exchange, automatic apparatus at said exchange for connectio to automatlc telephone lines thereat, a cord circuit at the switchboard for connection with the trunk line, means for applying signaling current from the cord circuit to the trunk circuit, a relay connected to said trunk at the manual switchboard and responsive to said signalling current, a relay at the automatic exchange end of said trunk circuit thereupon responsive to the first said relay for agplylng a ringing signal to the conductors lea ing toward the automatic apparatus.

7. In a telephone system, a trunk line leading from a manual switchboard to an automatic exchange, automatic apparatus for connecting with telephone lines at the automatic exchange, an operators cord circuit for connection with the trunk circuit at the manual switchboard, means for manually applying ringing current from the cord circuit to the trunk line, a relay connected to the trunk line responsive to said ringing current, and relay mechanism in the automatic apparatus responsive to the trunk relay for applying ringing current to a connected automatic line.

8. A first switchboard and a line extending therefrom to a springjack on a second switchboard, an operators cord switching circuit at a B board contiguous at said second switchboard adapted to be connected with said line, a first signal device on said B board, a second signal device on said second switchboard, means at said second switchboard under control of said first switchboard to disassociate the springjack from the line at said second switchboard and actuate the signal device on said second switchboard, together with said signal device on said B board.

9. A first switchboard and a line extending therefrom to a springjack on a second switchboard, an operators cord switching circuit at a B board adapted to be connected with said line, a signal device on said B board, means at said second switchboard under control of said first switchboard to disassociate the s ringj ack from the line at said second switchboard and actuate the signal device on said B board.

10. A first switchboard and a line extending therefrom to a springjack on a second switchboard, an operators cord switching circuit at a B board adapted to be connected to said line, means at said second from sai connecting means and under control of said first switchboard and adapted to be connected with said line, means at said B board under control of said first switchboard for connecting the B board operators telephone circuit with said line upon said switching circuit becoming connected with said line. a

12. A first switchboard and a line extending therefrom to a springjack on a second switchboard, an operators cord switching circuit at a B board adapted to be connected to said line, and means at said second switchboard under control of said first switchboard to effect such connection and also connect the said line with the B board operators telephone circuit.

13. A first switchboard and a line extending therefrom to the springjack on a second switchboard an operators cord switching circuit at a B board adapted to be connected with said line, a first signal device on said second switchboard actuated from said first switchboard independently of other circuit changes relating to said line at said second switchboard, and means under control of said first switchboard for connecting the B poard operators telephone circuit with said 14. The combination of a B board in a manual exchange, a toll board, a toll line connected with both said boards, a remote toll board connected on said toll line, means on said remote toll board whereby the operator on the said remote toll board can signal the said first toll board and connect directly into the operators circuit of the said B board at will, signal devices on said first toll board which indicate when said remote toll operator has taken access to the said B board.

15. The combination of a B board in a manual exchange, a toll board, a toll line connected with both said boards, a remote toll board connected on said toll line, means on said remote toll board whereby the operator at the said remote toll board can signal the first toll board or the operator at the said B board at will, signal devices on said first toll board that will indicate during time said operator at said remote toll board holds access to said B board.

16. The combination of a subscribers line as a part of an exchan e, a. B board in that exchange, a toll boar a toll line connected neeaoeo with both said boards extending to a remote toll board, means whereby an operator at said remote toll board can signal the said first toll board or can communicate telephonically direct with the operator at the said B board at will, and si al devices on said remote to board that wil evidence or display only if access is obtained to said B board.

17. The combination of a subscribers line as a part of an exchan e, a B board in that exchange, a toll boa a toll line connected with both said boar s extending to a remote toll board but whi may be cut 011 from said B board by me under control of an operator on said tollboard when the toll line is in normal state, means on said remote board whereby an operator at said toll board can obtain access to said B board or si a1 said first board normally, signal devices and means controlling same whereby the .operator at the remote toll board is enabled to determine if the said subscribers line when connected'at said B board with said toll line is responded to or not responded to.

18. The combination'of an automatic exchange, a toll board, a trunk line extendin from said automatic exchange to said to board, a toll line extendin from said toll board toa remote toll boar and to a remote B board, the latter as a part of a manual exchange, means whereby the operator at said first toll board is enabled, at will, to signal the operator at said remote toll board or communicate telephonically with the operator at said B board, over said toll line, to the end of obtaining telephonic access to a subscribers line in said manual exchange, means whereby the operator at said remote toll board is enabled to si :11, at will, the said first toll board and there y gain the responseofthe operator at said toll board or to enable the opierator at said remote toll board to select a su cribers line in said automatic exchange.

19. The combination of a B board in a manual exchange, a toll board, a toll line connected at one end with both said boards, a remote toll board on said line, a B operators cord and telephone circuit, means controlled from said remote toll board whereby the o erator at said remote toll board can signa at will the first toll board or connect with the B operators circuit direct.

20. The combination of a B board in a manual exchange having an operators cord circuit, a toll board havfng toll line jacks, a toll line permanently connected with both the circuits of said boards, a remote toll board having access to said toll line by way of two springjacks, normal access to said toll line and toll board being obtained by way of one of said'sprv'ngjacks while access to said B board and operators cord circuit is obtained by way of the other of said springjacks, and

means for effecting such alternative connections.

21. The combination of anautomatic exchange. a toll line extending from said exchange to two associated springjacks on a remote toll board, other stations on the toll line, connection to one of said two'springjacks eifecting connection with said line and other stations independent of the automatic excha n connection to the other of said two spring-3 acks efiectnv circuit changes for controlling selection into said exchange from said board, and operators cord switching means for connecting with said sprin 'acks.

22. The combination of a B boar and a second switchboard, a line extending from a cord circuit at the B board and answering jack at the second board to a first and a second spring jack apparatus associated with said lme so that a normal connection to the first of said springjacks will operatively connect the line and cord, circuit of the board and disassociate the answering jack and a normal connection with the second 0 said sprin 'acks will operatively connect the line with t e second of said switchboards.

23. A first board and a line extending therefrom to a springjack on a second board, a first switching circuit from said line to a cord circuit at a B board and controlled from said first board, means for extendin said line circuit to a telephone line circuit by way of said B board cord circuit, super vlsory signals on said first board and means for actuating same from said telephone line, and means for connecting said line at each board to other lines.

24. A first board and a line extending therefrom to a second board, a switching circuit extending to a cord circuit at a B board from said second board, means under control at said first board for connectin said line to the operators circuit of said B board cord circuit, and a signal device on said first board controlled from said B board to indicate that access has been obtained to said B board, and means whereby said line may be connected to another line at any one of the three boards.

25. A first board and a line extending therefrom to a second board, a switching circuit extending from the line to a cord circuit at a B board and controlled from said first boa-rd, means at said cord circuit under control of said first board for controlling the connecton of said line to the operators circuit of the said B boa-rd cord circuit, and means at the said second board for preventing such connection at will, and a signal device on said first board controlled from said B board to indicate that access has been obtained to said B board.

26. A first board and a line extending therefrom to a second board, a switchin circuit extending from the line to a cord circuit at a B board and controlled from said first board, means at said cord circuit under control of said first board for connectin said line to the operators circuit of said B oard cord circuit and means at said second board for preventing such connection at will, means for preventing access to said line from sald second board while said line is in access to said switching circuit, and a signal device on said first board controlled from said B board to indicate that access from said line to said B board has been obtained.

27. A first board and a line extending therefrom to a second board, a switching circuit extending from the line to a cord circuit at a B board and controlled from said first board, means at said second board under control of said first board for connecting said line to the operators circuit of said B oard, and means at said second board for preventing such connection at will, and means for reventing access to said line from said second board while said line is in access to said switchin circuit.

28. A first board and a first line extendin therefrom to a springj ack on a second boar a first switching circuit extending from the line to a cord circuit at a B board adapted to be connected to said first line, a second line and means for connecting said cord circuit to said second line at said B board, means under control of said first board to connect said first line to said cord circuit, and a si al lam associated with said cord circuit w ich wil glow upon said cord circuit becoming connected with said first line and will extinguish when said cord circuit has been connected to said second line and will again glow upon said first line becoming disengaged from said cord circuit.

29. A line connected to a signal device on a switchboard, said line also connected to an automatic exchan e, means adapted to be associated with said line for controlling selection in said exchange, and means for actuating said si nal device and a second signal device on sai line, the latter which will actuate under control of the called line in the said exchange.

30. A line connected to a springjack on a switchboard, said line also connected to an automatic exchange, a signal device on said switchboard, a first means for connecting to said line through said springjack, a second means adapted to be associated with said line for control selection in said exchange, and a third means under control of said second means which will preclude free access to said line from time of first operation of said first means until the response of arty on the line called b the selection and will also cause said signal evice to actuate and remain actuated until said first means has been returned to normal condition.

31. An automatic exchange, a line leading therefrom to a means adapted for controllin selection in said exchange, a relay connected in a bridge of said line susceptible to signaling currents which upon actuation disassociates said exchange from said line as regards current for controlling selection.

32. An automatic exchange, a line leading therefrom to a means adapted for controlling selection in said exchange, a relay susceptible to signallin current in control of a means ada ted to 'sassociate said exchange from sai line as regards current for controlling selection during the time said signal current is acting.

33. An automatic exchange, a line leading therefrom to a means adapted for controlling selection in said exchange, an intermediate current impulse repeatin device, a relay associated with said line a apted to be responsive to currents of an abnormal nature as regards currents for controlling selection, the said relay ada ted to disassociate operative circuits in sai repeatin device which normally function in contro ling selection.

34. A line upon which is a means for controlling selection leading to a first selector in an automatic exchange, an auxiliary relay on said line, said relay adapted to res 0nd to the first impulse of current for contro ling selection over said line, a si al lamp controlled from said relay which will glow responsive to the first selecting impulse and remain glowing until said line has been released for return to normal condition, and means for said releasing.

35. In a telephone system a manual switchboard, an automatic exchange,-a toll line connecting said switchboard and exchange, an operators cord circuit at the manual switchboard, automatic apparatus and telephone lines in the automatic exchange controlled from said operators cord circuit, a relay in bridge of the toll line operated b the a plication of ringing current from t e coufcircuit to efi'ect the a plication of ringing current to the called 'ne, and means controlled at the manual switchboard for releasing said connection.

36. A telephone system including a manual switchboard and a toll switchboard in an automatic exchange, a toll line connecting said switchboard and toll board, automatic apparatus in the automatic exchange controlled from the manual switchboard for extending connections to lines in the automatic exchange, and a signal at the toll board in the automatic exchange to indicate the toll operator thereat that the remote operator is securing connection with a local subscriber in the automatic exchange.

37. A telelphone system comprising a manual switc board in a manual exchange, a second manual switchboard in an automatic exchange, a toll line connecting said switchboards, a B board at the manual exchange and a cord circuit thereat connected with said toll line, means whereby the operator at the manual switchboard m the manual exchange may extend connection over said toll line through automatic apparatus to a line in the automatic exchange, and means whereby connection may be extended from a telephone line in the automatic exchange to a telephone line. in the manual exchange through said automatic toll board and toll line and the B board cord circuit.

38. A telephone, system comprising a a manual switchboard in a manual exchange, a

second manual switchboard in an automatic exchange, a toll line connecting said switchboards, a B board at the manual exchange and a cord circuit thereat connected with said toll line, means whereby the operator at the manual switchboard may extend connection over said toll line through automatic apparatus to a line in the automatic exchange,

and means whereby connection may be extended from a telephone'line in the automatic exchangeto a telephone line in the manual exchan e throu h said automatic toll board and tolfline and B board cord circuit, and a signal at the manual exchange switchboard to indicate to the operator thereat the fact that a telephonic connection is being made to a subscribers line over said toll line through the B board cord circuit.

39. In a telephone system, a telephone line, a calling operators station at one end of the line, a supervisory signal at the calling station for indicating the condition of a called tele hone line connected at the other end of the line, and means for operating said signal operable from the called telephone end only of the line over asimplexed circuit including the first telephone line.

40. In a telephone system, a calling station, an automatic exchange including sub- 'scrlbers telephone lines and selective apparatus for connecting said station with said subscribers telephone lines in the exchange, a line connecting the calling station and the selective apparatus in the automatic exchange, and means at the calling station and at the automatic exchange 'for controlling the selecting operation of the selective apparatus over a simplexed circuit of the line connecting the callin station and selective apparatus for operating the selective a paratus to connect with a desired subscri ers telephone line.

41. A telephone system including a manual switchboard, an automatic exchange, a toll line connecting said switchboard and said automatic exchange, automatic selective a paratus in the automatic exchange normal y m operative relation with the toll line for effecting connection from the toll line to subline for controlling the selecting operation of the selective ap aratus.

42. In atelep one system,'acalling station, an automatic exchange including telephone lines and selective a paratus for connecting said station with said telephone lines in the exchange, a line connecting the calling station with a trunk lea-ding to the selective apparatus in the automatic exchan a translating device interposed between t e line and the trunk, means at the calling station for controlling the translating device over a simplexed circuit of the line said translating device in turn controlling the selective operation of the selective apparatus over the physical conductors of the trunk.

43.The combination of a subscribers line as a part of an exchan a B board in that exchange, a toll boar a toll line connected with both said boards extending to a remote toll hoard, means whereby an operator at said remote toll board can signal the said first toll board or can communicate telephonically direct with the operator at the said B board at will, means at first said toll board for barring said communication with the B board, and a si a1 device on said remote toll board for lndicating the state of the last said means.

44. The combination of an automatic exchange, a toll line extending from said exchange to two associated springjacks on a remote toll board, another station on the toll line, connection to one of said springjacks effecting connection with the said line and the said station independent of the auto matic exchange, connection with the other of said two springjacks efi'ecting circuit changes preparatory to effecting selective operation in the automatic exchange from said toll board, and .an operators cord switching means for connecting with said springjacks.

45. In a telephone system a near and a remote section ofa line, a relay associated with the near section of the line responsive to ringing current from a first source. a second source of ringing current for application to the remote section of the line primarily controlled by the relay, means whereby when ringing current is applied to the near section ringing current from the second source will be applied to the remote section, and automatically applied means for terminating the control of ringing current applied to the remote section.

46. In a telephone system, a telephone line, a calling operators station at one end of the line, a supervisory signal at the calling station for indicating the condition of a called telephone line connected at the other end of the line, and means controlled by the called line for operating said signal over a simplexed circuit of the first telephone line.

47. Ina telephone system, an automatic exchange, automatic switch mechanism in the exchange, an operators switchboard, a twosection toll line connectin the switchboard and exchange, a traflic o servation station connected intermediate of the said stations, a signal device at said station, a called line in the exchange, an impulse directive device of the switchboard, means for applying the directive device to the toll line, means for operating the switches by the directive device impulses to extend a connection over the toll line to the called line, and means for operating the signal device to indicate to the operator at the said station that a call has been initiated and that the switch mechanism is operating by way of extending the call.

48. A telephone system including a manual switchboard and a toll switchboard at an automatic exchange, a toll line connecting said switchboard and toll board, automatic apparatus in the automatic exchange controlled throu h the agency of control means at the manna switchboard for extending connections from the toll line to lines in the automatic exchange, a signal at the toll board in the automatic exchange, individual to the toll line operative upon a response being obtained on a called line in the automatic exchange, and efiaced upon the responded condition on the called line terminating.

49. A telephone system including a remote manual switchboard and a toll switchboard at an automatic exchange, a toll line connecting said manual switchboard and toll switchboard, automatic ap aratus in the automatic exchange controll dd through the agency of control means at the manual switchboard for extending connections from the toll line to lines in the automatic exchange, and a s gnal at the toll switchboard in the automatic exchange individual to the toll line operative at will from a called line.

50. A telephone system including a remote swilchboard and a toll switchboard contiguous to an automatic exchange, a remote section of a toll line connecting said remote switchboard and toll switchboard, a near sec tion of the toll line extending to the automatic exchange, automatic apparatus in the automatic exchange directively controlled from the said remote switchboard through a repeater joining the said toll line sections, a signal control means individual to the said near section which will operate a supervisory signal device under control of a called line in the automatic exchange.

51. In a telephone system, a subscribers line, an automatic exchange, a manual switchboard, a jack-ended trunk line leading from said manual switchboard to said automatic exchan e, an operators station at the automatic exc ange, automatic selective mechanism at the end of said trunk line in the automatic exchange for extending connecti on toward said an scribers line, a signal device directly connected with and individual to the trunk line at the said operators station, and relay mechanism for displaying said signal upon response from the said subscribers line and again actuate said signal upon the subscribers line returning to its original condition.

52. In a telephone system, an automatic exchange, automatic switch mechanism in the exchange, an operators switchboard, a twosection toll line connectin the switchboard and exchange, a traflic 0 servation station connected intermediate of the said sections, a signal device at said station, a called line in the exchange, an impulse directive device of the switchboard, means for applyin the directive device to the toll line, means or operating the switches by the directive device impulses to extend a connection over the toll line to the called line, means for operating the signal device in corres ondence with the directive impulses sent tom the directive device etfective to the said switches, and means controlled over the called line for operating the signal device to indicate the res onded or non-responded condition of the cal ed line.

53. In a telephone system, an automatic exchange, automatic switch mechanism in the exchange, an operators switchboard, a twosection toll line connecting the switchboard and exchange, a traflic observation station connected intermediate of the said sections, a signal device at said station, :1. called line in the exchange, an impulse directive device of the switchboard, means for applying the directive device to the toll line, means for operating the switches by the directive device impulses to extend a connection over the toll line to the called line, and means for operating the signal device to indicate to the operator at the said station that a call has been initiated.

54. In a telephone system, an automatic exchange, automatic switch mechanism in the exchange, an operators switchboard, a twosection toll line connectin the switchboard and exchange, a trellis o servation station connected intermediate of the said sections, a signal device at said station, a called line in the exchange, an impulse directive device of the switchboard, means for applyin the directive device to the toll line, means or operating the switches by the directive device impulses to extend a connection over the toll line to the called line, and means for operating the signal device in corres ondence with the directive impulses sent mm the directive device efiective to the said switches.

55. In a telephone system, an automatic exchange, automatic switch mechanism in the exchange, an operators switchboard, a twosection toll line connectin the switchboard and exchange, a traffic 0 ervation station connected intermediate of the said sections, a signal device at said station, a called line in

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