US1265716A - Measured-service telephone system. - Google Patents

Description

G. A. YANOCHOWSKI.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLlCATiON FILED FEB. 4, 1914. RENEWED APR. 30. 1911.

Patented May 7, 1918.

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MEASURED SERVlCE TELEPHONE SYSTEM. APPLICATION FILED FEB .4. 1914. RENEWED APR. 30. 1917.

1,265,716. Patented May 7,1918.

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MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION FILED FEB. 4. 1914. RENEWED APR- 30. 1911.

1 65,? 1 6. Patented May 7, 1918.

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GEORGE A. YANOGHOWSKI, OF CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MEASURED-SERVICE TELEPHONE SYSTEM.

mosaic.

Specification of Letters Patent.

Patented May 7,1918.

Application filed February 4, 1914, Serial No. 816,404. Renewed April 30, 1917. Serial No. 165,609.

To all whom it may concern:

Be it known that I, GEORGE A. YANocnowsnr, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented certain new and useful Improvements in Measured-Service Telephone Systems, of which the followin is a specification.

ll 1y invention relates to measured service telephone systems and has for its object the provision of a systemin which a call can be charged to either the calling or the called subscriber.

My invention is in the nature of an improvement on the system disclosed in the application of Albert Andersen for improvement in measured service telephone systems, Serial No. 804,902, filed December 5, 1913.

The object of my present invention is to provide improved means for operating the meters on either the calling or the called line, which means are controlled by an increased fiow of current instead of by a re versed flow of current, as in the Andersen invention. Furthermore, my improved means are operated over the trunk-release conductor, and in this manner I avoid the necessity of providing any eXtra wipers on the switch for the purpose of controlling the operation of the measured service device.

A further feature of my invention is the provision of a simplified cord circuit for use in semi-automatic systems.

These and other objects of my invention will be more clearly understood by reference to the accompanying drawings, in which I have illustrated my invention in connection with a semi-automatic telephone system employing switches of well-known types.

Figures 1, 2 and 3 taken together show a complete circuit connection between a calling substation A and a called substation A in a system embodying the principles of my invention. 7

Fig. 4: discloses a selector switch of the type for use between the line switch C and the connector switch H in a system so large as to require the use of such selector switch. This selector switch is disclosed in the prior art and its operation is fully degether with its individual meter M. The line switch 0 belongs to a group of similar line switches the plungers (not shown) of which engage a shaft and are controlled by the operation of the master switch D in such a manner that they are, when in normal position, held directly in front of an idle trunk line leading through a group of relays F to the answering jack J. At Q there is shown an operators cord circuit to which 1s added a calling device L which is herein represented by a pair of impulse springs.

In Fig. 2 there is shown a line switch C adapted to be seized by the before-mentioned cord circuit to extend a connection to the connector switch H.

Fig. 3 represents the called line switch C, together with its individual meter M and the called substation A.

The subscribers substation A is of any suitable or approved type and comprises the usual receiver 2, transmitter 3, switch hook 4, ringer 5 and condenser 6. Being an automatic substation it is also provided with an impulse transmitter or calling device which is represented herein by a pair of impulse springs 7 and 8 and an impulse wheel 9, which latter is assumed to be controlled through the medium of a finger hole dial (not shown) in such a manner that the impulse springs 7 and 8 may be momentarily separated a number of times corresponding to the digit called.

The subscribers individual switch C is of the general type of subscribers line switch shown in British patent to R. W. James No. 26,301 of 1906, being, however, of the particular type disclosed in British patent to T. G. Martin N0. 1419 of 1910. This line switch comprises among other details a plunger (not shown) attached to the end of a so-called plunger arm 10 which iscontrolled by the magnet 11. The magnet 11 comprises four windings, namely, a pull-down winding 12, a cut-off or holding winding 13, a line winding 14 and an auxiliary winding 15. The core of the magnet 11 is so constructed that the magnetic circuit of the windings l2 and 13 is separate from that of the windings 14: and 15. The winding 12 operates both the plunger arm 10 and the cut-off armature 16, while the winding 13 is only strong enough to operate the cut-ofi armature 16 and to hold the plun er arm 10 in its operated position. When the plunger (1724) is shown,

forming the terminal of a trunk line leading to a group of relays F, which relays are in turn connected directly with the answering jack J. Each trunk line is connected in multiple with the corresponding springs of all the line switches of the group which is controlled by the master switch D. The switch G is controlled bythe subscriber through the medium of the line relay 14,

as will be hereinafter more fully explained.

Associated with theline switch C is a registering meter M which is operated by a doublewvound slow acting magnet 50. The windings of the magnet 50 are so proportioned that it requires the energization of current fed to both windings in the same direction to attract the armature, said armature being unaffected by the *energization of either winding alone, or by the energization of the two windings in opposition to each other. I preferably make the magnet 50 slow acting so that it will not respond to alternating current when the substation is called.

The master switch D is of the same gen- 'eral type as that disclosed in British Patent 7 No. 26,801 of 1906, referred to above, being,

however, of the particular type disclosed in said British Patent No. 1419 of'1910. The function of the master switch, as is well known, is to maintain the plungers of all the idle line switches in position to engage the terminals of an idle trunk line.

The device F consistsof a group of re lays, together with the usual line signal lamp 25. These relays control the battery the calling 'subscribers substation. The relay 26 is a marginal relay that is, it does not receive suficient current when energized in series with to operatively energize, but takes the combined strength of the batteries B and B to operatively energize. However, when the said relay is once energized itreceives suiiicient current through the relay 27 to remain operatively energized.

The operators cord circuit 0 is provided with the usual supervisory signals 29 and 30. The signal 30 is controlled by a polarized relay 31' bridged across the conductors 32 and 33, which bridge includes the key K The signal 29 is controlled by the relay 27 and the springs 28. The springs 28. are plug seat springs-that is, they are normally separated when the cord circuit is not in use.

The cord circuit is also provided with the keys K and K each of which controls means to operate the meters at the calling and called substations in a manner to be the relay 27 meagre hereinafter more fully described. The usual listening key K is also provided, together with the key K for bridging the calling device L across the cord.

The line switch C (Fig. 2) is similar in all respects to the line switch C.

The connector H is of the same general type of connector switch disclosed in United States Letters Patent No. 815,17 6, granted March 13, 1906, to Keith, Erickson and Erickson, the circuits, however, being modified to adapt the switch to operate in a sys tem in which controlled by impulses delivered over the two sides of the line in series. The connector is provided with a shaft (not shown) carrying the wipers 34, 35 and 36, which shaft is controlled by the vertical magnet 37 and the rotary magnet 38. The'usual side switch comprising the wipers 39, 40, 41 and 42 is controlled by the private magnet 43 in the usual well-known manner; The magnet 44 is the usual release magnet. The line rclay 45 is connected with the calling line through the reversing springs of the socalled back-bridge relay 46. The said backbridge relay 46 is connected with the called line through the reversing springs of the relay 47. The relay 47 is a marginal relay that is, it will not operatively energize. when it receives current only over the circult including the high resistance winding 48 of the line switch C and the battery B in series, but when the key K is operated at the cord circuit 0, the said relay 47 receives sufiicient current from the battery B over a path of comparatively low resistance to operatively energize. andB are adapted to be connected in series with the winding 4Sthat is, one has its negative pole grounded and the other has its positive pole connectcd'to ground. The ringing relay 49 is the means through which ringing current is applied to the called line.

The line switch C, the meter M and the called substation A are similar in all respects to the line switch C, the meter M and the called substation A.

Having given a general description of the apparatus involved in the, system, in order to give a complete understanding of my invention I will now scriber at substation A. may obtain connection-with the subscriber at the substation A, and how the call maybe charged either to the substation A or the substation A.

Upon the removal of the receiver from the switch-hook 4 at the substation A, a circuit is closed through the line winding 14 of the individual switch C, thereby attracting the line armature 51. The armature, upon being attracted, closes a circuit through the pull-down coil 12 in series with l the auxiliary winding 15. The pull-down the central oflice apparatus is The batteries B describe how the sub- 1 coil, upon energizing, attracts the armature 10 to force the plunger into the bank of springs 17 to 24, inclusive. It also operates the cut-off armature 16, thereby disconnecting the line winding 14 from the line. The armature 51 does not fall back immediately, however, owing to the fact that the winding 15 is still in series with the pull-down winding 12. Upon the armature 10 being drawn down, the springs 52 and 53 are brought together to short-circuit the auxiliary winding 15, making the same slightly slow acting. The armature 51 being slow to fall back allows sufiicient time for a holding circuit for the cut-off or holding winding 13 to be closed in the switch ahead. The engagement of the springs 17 and 20 with the springs E21 and 24, respectively extends the subscribers lines to the line relay 54 of the group of relays 1*. The line relay 54 is thereupon energized and closes the said holding circuit. This circuit extends from ground G through the contact of springs 55, bank springs 22 and 18 and the said holding winding 18 to the battery lead 100, thence through battery B to ground. The winding 13, upon energizing. holds the armature 16 and the armature 10 in their operated positions after the circuit of the pulldown winding is broken by the falling back of the line armature 51. A guarding ground potential is supplied to the connector private bank contact of the calling line as soon as the relay'54 is energized. This circuit extends over the above circuit to the bank spring 18, thence over the conductor 56 to the said private bank contact. The magnet is now carrying current in both of its windings but is not operatively energized, as the two windings are energized in opposition to each other. A further result due to the energization of the relay 54 is the closure of a circuit through the line signal 25. The said circuit extends from ground G through the contacts of springs 57, springs 58 and the said line signal to the battery lead 100, thus causing the said lamp to glow and signal the operator that a. connection is desired.

The operator immediately inserts the plug P into the jack J, which operation causes the springs 59 to close contact and form a new holding circuit for the holding winding of the line switch C. This circuit extends from ground G2 through contact of springs 59, springs 22 and 18, holding winding 13 to battery lead 100. A further result due to the inserting of the plug P into the jack J is the closure of a circuit through the relays 27 and 60. The said circuit extends from ground G through the relay 27, sleeve of the plug P, bush of the jack J. springs 61 and the relays and 26 in multiple to the battery lead 100. The relay 27, upon energizing, opens the circuit of the supervisory lamp 29 at the springs 62. The relay 60, upon energizing, opens the circuit of the line signal lamp at the springs 58. The relay 26 does not receive sutlicient current over this circuit to operatively energize. The operator answers by throwing the key K to bridge her talking set across the line. The operator now takes the calling subscribers order. -VVe will assume that the subscriber A is desired, whose number is 20, and that the calling subscriber Wishes to have the call charged to the substation A. The operator then inserts the plug P into the Jack J and operates the key K to bridge the calling device L across the conductors 64 and 65 leading to the line switch C The line switch C operates in the same manner as described for the line switch 0 to extend the line connection to an idle connector H. The line relay 45 of the connector H is immediately energizedf This circuit extends from ground G through the lower winding of said relay, springs 67 of the back-bridge relay 47, bank springs 68 and.69, conductor 65, springs 73 of the jack J ring of the plug P, key K calling device L, key K tip of the plug P spring 74 of the jack J, conductor 64, bank springs 71 and 70, springs 72 and the upper winding of the relay 45 to battery 13. The relay 45, upon energizing, closes a circuit through the slow acting relay 7 5. This circuit extends from ground G through contacts of springs 83 and 84, winding of relay 75 to battery lead 100. The relay 75. upon energizing, closes a hold ing circuit for the holding winding 48 of the line switch C This circuit extends from ground G5 through the marginal relay 47, springs 76, bank springs 77 and 7 8 and the said holding winding of the line switch C to battery B. A further result due to the energization of the relay 75 is the preparation of a circuit for the vertical magnet 37 through the springs 80 and 79 and opening the circuit of the release magnet 44 at the springs 80 and 81. The apparatus is now in readiness to receive impulses for the first digit 2.

The operator now operates her calling device for the first digit 2, whereby the impulse springs of the calling device are'operated twice momentarily, each time breaking the circuit of the line relay 45. Since the relay 75 is slow acting it does not deenergize during the momentary interruptions of its circuit by the relay 45, so that each time the latter relay is deenergized, a circuit is closed extending from ground G through the contacts of springs 83 and 82, springs 80 and 79, relay 85, vertical magnet 37 and the side switch wiper 39 (in first postion) to battery 13. The vertical magnet receives two impulses over this circuit and operates to raise the switch wipers 34, 35 and 36 to a position opposite the second level of bank contacts. The relay 85 which was included in series with the vertical magnet, remains in its energized position during the entire time that impulses are being sent through it and. operates to close the. circuit of the private magnet 43. This circuit extends from ground G through the springs 89 and 87 and the said magnet 43 to battery B.

'After the last impulse is delivered, the re- I magnet 38 inseries with'the relay 85, whereby the shaft wipers are rotated onto the contacts of the desired line. If the called line is idle, the private magnet 43 denergizeswhen its circuit is broken by the relay 85 after: the last impulse is delivered to the rotary magnet. The denergization of the private magnet allows the side switch'to advance one more positionthat is, from second to third posltion. By the engagement of the side switch Wipers 41 and 42 with their third-position contact points, and

by the e'nergization of the bridge-cut-oii winding 90 of the line switch C, the con-- nection is completed with the called substation. The said circuit for the bridge cut-ofi winding extends from ground G through the side switch wiper 40 (in third position), private wiper 35, conductor 91 and the winding 90 to the battery lead 100. A guarding-ground potential is supplied to the contacts of all connector private banks which are multipled to the called line, which prevents thecalled line from being seized by some other connector switch. A circuit is also closed-through the right-hand winding of the meter M which extends over the alcove-tracedcircuit and from the conductor 91 through the right-hand winding of the 'the said polarized relay is battery lead 100. By the meter M to the battery lead 100. The meter Mwdoe's not operate at this time, asit takes the combined strengthof both of its windings for it to operatively energize. The

operators key K is restored to normal, thus bridging the polarized relay 31 across the conductors 64 and 65, The current through to. cause the armature 92 to, close contact with the'spring 93, thus causing lamp 30 to glow.- This circuit extends from ground G through contacts 92 and 93 and lamp 30 to engagement. of the side switch. wiper 39 with its third-position contact relay 49 closed. This circuit extends from in the direction point, the-circuit of the ringing inserts ground G through'the interrupter 94, re-

49, springs 95 and the side switch wiper 39 (in third position) to batter The ringing relay, uponenergizing, isconnects' the calling line from the called lineand bridges the ringing current generator it across the called line, The ringing relay is energized only intermittently through the medium of the interrupter 94. Upon the response of the called subscriber his line is provided with talking current through the back-bridge relay 46. The relay 46, upon energizing, closes the circuit of the ringer cut-01f relay 96. .This circuit extends from ground G through the side switch wiper 40 (in third position), springs97 and the relay 96 to battery B. The relay 96, upon energizing, breaks the circuit of the rlngin relay 49 at the springs 95 and closes a 100 ing circuit for itself through the springs 98 independent of the springs 97. A further. re sult of the energization of the back-bridge" relay upon theresponse of the called subscriber is the transposition of the battery connection of the windings of the line relay 45 with regard to battery 13, whereby the direction of current in the trunk conductors 64 and 65 is reversed. The reversing of the current in the said line causes the polarized relay 31 of the cord circuit 0 to operate its armature in the opposite direction, I thus causing the supervisory lamp 30 to cease glowing. The fies the operator that the'calledparty has answered. She now communicates with the called subscriber at the substation A a and inquires if he will receive a call from substation A and have the call charged to his meter. Assuming that the called subscriber has agreed to receive the call, the operator presses the key K thereby closing a circuit from battery B through the relay 47 at the connector H. This circuit extends from ground G through battery B, key K sleeve of the plug P, bush of the jack J, conlamp 3O ceasing to glow noti;

'ductor 66, bank springs 78 and 77, springs 7 6 and t -he right-hand Winding of the relay 4'? to ground G This circuit being of com: paratively lowv resistance suiiicient current passes through the relay 47 to cause it to operatively energize. The winding 48 of the line switch C is maintained energized while the key K cuit extending from ground G through battery B, over the above-traced circuit to the bank spring 78, then through thewinding 48 to battery B, thence through battery B to ground G, the two batteries operating in series. The relayv 47, upon energizing, completes a locking-circuit for itself extending from ground G through the left hand windingvof said relay, contact of springs 102, sideswitch wiper-39 (in third position) to battery B; A further result of the energization of the relay 47 is the transis being pressed over a cirof the current over the called line is reversed. The reversing of the current over the called line causes the current in the windings of the magnet 108 of the meter M to assist ea h other and as a consequence the armature of said magnet is attracted and operates to register the call upon the meter M. The magnet 103, upon energizing, also closes the contact of springs 10%, whereby the left-hand winding is short circuited and the magnet remains held in its operated position by the right-hand winding alone, which, although it is not strong enough to operate the armature alone, is strong enough to hold it in its operated position. The subscribers may now carry on an uninterrupted conversation over the heavy conductors shown.

At this point in the operation, attention is called to the circuit for operating the relay 47 in a system wherein the selector M is used. lVhen the operator presses the key K this circuit extends from ground G through battery B, key K, sleeve of the plug P, bushing of the jack J, conductor 66, bank springs 78 and 77, conductor 201 (Fig. r), springs 202, side switch arm 203, springs 204, side switch arm 205, wiper 206, conductor 207, spring 76 (Fig. 2), and the right hand winding of the relay 47 to ground (i Relay 7 operates over this circuit the same as before described to accomplish the same result.

The replacing of the receivers at the called and calling substations signals the operator that the conversation has terminated. When the receiver at the substation A. is restored to the switch-hook, the separation of the hook-switch spring destroys the energizing circuit of the line relay 54. The line relay 5%, upon denergizing, opens the circuit of the relays 27 and 60 at the springs 61. The relay 27, upon denergizing, completes a circuit through the supervisory lamp 29. The said circuit extends from ground G through the plug seat springs 28, springs 62 and the said supervisory lamp 29 to the battery lead 100. The replacing of the receiver at the called substation A opens the circuit of the backbridge relay 46 at the switch-hook springs 105 and 106. The denergization of the re lay l6 reverses the current back to normal in the conductors 64: and 65, which causes th polarized relay 31 to attract its armature in the opposite direction, causing the supervisory lamp 30 to again glow. The operator having received the disconnect signal removes the plug P from the jack J, thereby destroying the holding circuit for the holding winding of the line switch C. The holding winding of the line switch C,

upon deenergizing, allows the plunger arm 10 to return to normal position. The plug P returning to normal position opens the circuit of the supervisory lamp 29 at the springs 28. The removing of the plug P from the jack J destroys the energizing circuit of the line relay 45 of the connector H. The relay 4:5 is thereupon deenergized and opens the circuit of the relay 75. The relay 75, upon deenergizing closes the circuit of the release magnet 44. This circuit extends from ground G through the contact of springs 83 and 82, springs 80 and 81, ednormal springs 107 and the release magnet 44 to battery B. The releas magnet, upon energizing, restores the switch shaft and side switch wipers to normal position and its own circuit is broken at the springs 107 when the shaft reaches its lowest position. The relay 75, upon denergizing, also opens the holding circuit for the winding &8 of the line switch (1 at the springs 76. The line switch G releases in the same manner as explained in connection with the line switch C.

If the subscriber at substation A had not asked that the charges be reversed, the connection would have been the same as explained above, but the charge would have been made to the calling substation meter M in the following manner: The operator completes the connection in the same manner as before described; then, as soon as the called subscriber answers, the key K is pressed, which causes the relay 26 to be operatively energized. The said circuit eX- tends from ground G through th battery B, key K, sleeve of the plug P, bush of the jack J, springs 61 and the relay 26 to battery B, thence through battery B to ground G. The two batteries operating in series cause the relay 26 to be operatively energized. The relay 26, upon energizing, causes the transposition of the battery connections to the calling line, whereby the direction of current in the calling line is reversed. The reversing of the current over the calling line causes the meter M to oper ate in the same manner that the meterM operated at the substation A to register the said call.

In case a line is already busy when called, the calling subscriber is given a busy signal from the busy machine Q in the usual and well-known manner.

It will thus be seen that I have devised a very eflicient measured service system in which the call can be charged against either the meter on the calling line or the one on the called line. Furthermore, this means is operated over the private wiper, thus avoiding the necessit of the addition of a special wiper to any 0 the switches. While in the system I have illustrated I have shown certain types of automatictelephone switches and a certain form of cord circuit, it will, of course, be understood that I do not wish to be limited to the type 'ofswitches em ployed, as my invention is equally as well adapted for use in connection with other forms ofswitches and cord circuits. Likewise, it will be readily understood that if desired selector switches of any well-known type can be inserted between the line switch and the connector for the purpose of 111- creasing the capacity of the system. The use of such selectors being well known in the art, it is not thought necessary to further describe the manner in which they are employed. Various other changes and modifications will readily suggest themselves to thoseskilled in the art and come within the contemplated scope of my invention.

What I claim asmy invention is 1. In a telephone system, a calling and a called subscribers line, a registering device associated with said called line, means including an automatic switch for establishing connection between said lines, said switch inlease circuit including said private wiper,

and means controlled by said operator over said private wiper for operating the meter on the called line after the connection has been established.

3. In a telephone system, called subscribers line, on said called line, an operators cord circuit adapted to be connected with the calling line,

a calling and a an automatic connector switch for connects ing with the called line, means including a trunk-selecting switch for extending connection from said cordcircuit to said connector, a holding circuit for said trunk-selecting switch, and means controlled by said operator over said holding circuit. for operating the meter on the called line after said connection has been established.

4. In a telephone system, a calling and a called subscribers line, a registering device on said called line, an operators cord circuit adapted to be connected with the calling line, an automatic connector switch forconnecting with the called line, means including a trunk-selecting switch for extending connection from said cord circuit to said connector, a holding circuit for said trunk-sethe calling line, an switch for connecting a registering device insane cord circuit adapted tobe connected with the calling line, an automatic connector switch for connecting with the called line, means for extending a connection from said cord circiiit to said connector, a relay in-said connector, means for closing a circuit through said relay without operatlvely energizing the same when connection is established with said connector, means controlled by erator for increasing through said relay to same, and means controlled by the operation of said relay for operating the registering device on the called line. Y v

6. In a telephone system, a calling and a called subscribers line, a registering device associated with the called line, an operators cord circuit adapted to be connected with automatic connector said opthe flow of current means for extending a connection from said cord circuit to said connector, a relay in said means for closing a circuit through said relay without operativelyenconnector,

ergizing the same when connection is established with said connector, means controlled by said operator for increasing the flow of current through said relay to thereby opera ate the same, means controlled by the opera thereby operate the with. the called line, i

tion of said relay for operating the registers a ing device on the called line, and a locking circuit for said relay for maintaining the same energized until the connection is released.

7. In a telephone system, a calling and a called subscribers line, a registering device associated with the called line, an operators cord circuit adapted to be connected with the calling line, an automatic connector switch for establishing connection with the called line, means including a trunk-selecting switch for extending the connection from said cord circuit to said connector switch, a relay in said connector, means for closing a circuit through said relay without operatively energizing the same when connection is established with said connector, means controlled by said operator for increasing thereby operate the same, and means controlled by the operation of said relay for. operating the meter on the called line after y the flow of current through said relay vto cord circuit adapted to be connected with the calling line, an automatic connector switch for establishing connection with the called line, means including a trunk-selecting switch for extending the connection from said cord circuit to said connector switch, a relay in said connector, means for closing a circuit through said relay without operatively energizing the same when connection is established with said connector, means controlled by said operator for increasing the flow of current through said relay to thereby operate the same, means controlled by the operation of said relay for operating the meter on the called line after said connection has been established, and a locking circuit for said relay for maintaining the same energized until the connection is released.

9. In a telephone system, a calling and a called subscribers line, means for establishing connection between said lines, a relay, means controlled by the establishment of said connection for closing a circuit through said relay without operatively energizing the same, means for increasing the flow of current through said relay to thereby operate the same, a registerin device for charging a connection to the cailed line, and means controlled by the operation of said relay for causing the operation of said registering device.

10. In a telephone system, a plurality of subscribers lines, means including an operators cord circuit for establishing a connection between two of said lines, a relay, means controlled by the establishment of said connection for closing a circuit through said relay without operatively energizing the same, means controlled by said 0 erator for increasing the flow of current t irough said relay to thereby operate the same, a registering device for charging a connection to the called line, and means controlled by the operation of said relay for operating said registerin device. a

'11. n a telephone system, a calling and a called subscribers line, a meter associated with the called line, a meter magnet having a pair of energizing windings for controlling the operation of said meter, means including an automatic switch for establishing a con nection between said lines, said switch including a pair of line wipers and a private wiper, a trunk-release circuit including said private wiper, means for initially energizing the windings of said meter magnet in opposition, whereby said magnet is not operated, and means controlled over said private wiper for reversing the current in one wind ing to thereby cause the operation of said meter magnet. s

12. In a telephdne system, a calling and a called subscribers line, a meter associated with the called line, a meter magnet having a pair of energizing windings for controlling the operation of said meter, an operators cord circuit adapted to be connected with the calling line, means including an automatic switch for extending connection from said cord to said called line, said switch including a pair of line wipers and a private wiper, a trunk-release circuit including said private wiper, means for initially energizing the windings of said meter magnet in opposition, whereby said magnet is not operated, and means controlled by said operator over said private wiper for reversing the current in one winding to thereby cause the operation of said meter magnet.

13. In a telephone system, a calling and a called subscribers line, a registering device on said called line, an operating magnet therefor having a pair of energizing windings, an operators cord circuit adapted to be connected with the calling line, an automatic connector switch for connecting with the called line, means including a trunk-se-- lecting switch for extending connection from said cord circuit to said connector, a holding circuit for said trunk-selecting switch, means for initially energizing the windings of said register operating magnet in opposition, and means controlled by said operator over said holding circuit for reversing the current in one winding of said magnet to thereby cause the operation of said registering device.

1a. In a telephone system, a callin and a called subscribers line, a registering device associated with the called line, an operating magnet therefor having a pair of energizing windings, an operators cord circuit adapted to be connected with the calling line, an automatic connector switch for connecting with the called line, means for extending connection from said cord circuit to said connector, means for initially energizing the windings of said magnet in opposition, a relay in said connector, means for closing a circuit through said relay without operatively energizing the same when connection is established with said connector, means controlled by said operator for increasing the flow of current through said relay to thereby operate the same, and means controlled by the operation of said relay for reversing the current in one winding of said magnet to thereby cause the operation of said registering device.

15. In a telephone system, a calling and a called subscribers line, a registering device associated with the called line, an operating magnet therefor having a pair of energizing windings, an operators cord circuit adapted to be connected wth the calling line, an automati connector switch for connecting with the called line, means for extending connection from said cord circuit to said connector, means for initially energizing the windings of said magnet in opposition, a

relay in said connector, means for closing a circuit through said relay without operatively energizin the same when connection is established wit said connector,-means controlled by said operator for increasin the flow of current through said relay to t ereby operate the same, means controlled by the operation of said relay for reversing the current in one winding of said magnet to thereby cause the operation of said registering device, and a locking circuitfor said relay for maintaining the same energized until the connection is released.

16. In itelephone system, a calling and a called subscribers line, means for establishing connection betweensaid lines, a relay, me ns controlled by the establishment of i said connection for closing a circuit through said relay WltllOLlt operatively energizing the same, means for increasing the flow of current through said relay, to thereby operate the same, aregistering device, an operating magnet therefor havinga pair of en ergizin windings, means forinitially energizing said windings in opposition, whereby 7 said magnet is not operated, and means controlled b the operation of said relay forreversing the currentin one winding to thereby cause the operation of said registering device.

17. In a telephone system, alplurality of subscribers? lines, means including an operators cord circuit for establishing connection between two of said lines, a relay, a registering device, an operating magnet therefor having a pair of energizing windings, means controlled by the establishment of said connection for closing a circuit through said relay without operatively energizing the same and for closing a circuit through the windings of said magnet in 0p 7 7 position, whereby said magnet is not operated, means controlled by said operator for increasin the flow of current through said relay to t ereby operate the same, and means controlled by the operation of said relay for reversing the current in one winding of said magnet to thereby cause the operation of said registering device. v

18. In a telephone system, a plurality of subscribers lines, means including an operators cord circuit for establishing connec tion between two of said lines, a registering device, an operating magnet therefor having a pair of energizing windings, means for initially energizing said windings in opposition, whereby said magnet is not operated,

and means controlled by said operator by an increased flow of current for reversing the current in one winding of said'magnet to thereby cause the operation of said registering device.

19. In a telephone system, a plurality of subscribers lines, means including an operators cord circuit for establishing connection between two of said lines, said cord circontacts and a t ir each link. 7 v p 23. In a telephone system, a calling line, a called line, a

cuit including a 111 having a pair of line normally contact,a plug seat. switch, a relay connected to said third conrelay and across the called end of said cord, and a second supervisory signal controlled by grid polarized relay, a meter, and means for an ergizing said meter oversaidthird contact.

20. In a telephone system, a calling line, a called line, a manual cord circuit link: and an automatic progressively movable switch 7 link for connecting the. two lines, a meter for charging the call to the called line, and a section individual to j each '21. i a called line, a manual cord circuit link and an automatic link for connecting the two lines .-a meter individual controlling circuit for said, meter havinga individual -t0 eachy link. If

a called line, a I y I an automatic progressively movable switch In a telephone system, a calling line,

progressively movable switch 7 to'thefcalled line, 'and'a controlling circuit for said-meter having a section" link for connecting the two lines, .a'meter for chargi the call controlling circuit section individual to to the calledalinau and a manual cord circuit link and for said meterfhavinga the called i line 1 and-to an automatic progressively movable switch" link for connecting the two lines, a incterin-.-:-

dividual to the called individual to link.

.24. Ina telephone system, a called line, an automatic link for connecting the two lines, saidlihks line, and a controlicj' ling GlI'CllltfO-D said meter' havinga section the called line and to 'each' l a ca 111 6;"

a manualcord circult link. and; progressively movable switch lint normally disconnected, a meter for charging--- the call to the called line and a controlling circuit for said meter having a section dividual to each link.

25. In a telephone trunking system, a calling line, a called line, a plurality of link circuits forconnecting the two, a meter for charging the call to the called line, a controlling circuit for said meter having a section individual to each link, a guarding potential circuit for one of said links for mak- 26. In a telephone trunking "system, a calling. line a called line, a plurality of link circuits for connecting the two, a meter inual to each link, a guarding potentialcircuit izo ing it busy whilethe two lines are'connected, said guarding circuit and said controlling clrcult using a conductor 111 common;

' dividual to the called line, a controlling cir- 'cuit for said meter having a section individ- I anaemic tor one of said links for making it busy while the two lines are connected, said guarding circuit and said controlling on curt a conductor in common.

in a telephone trunhng system, a calling line, a called line a plurality of link circuits for connecting t e two, a meter for charging the call to the called line, a controllin circuit for said meter having a section in 'vidual to thecalled line and to each link, a guarding potential circuit for one of said links for making it busy while the two lines are connected, said guarding circuit and said controlling circuit using a conductor in common.

28. in a telephone trunking system, a calling line, a called line, a plurality of link circuits for connecting the two, a meter individual to thecalled line, a controlling circuit for said meter having a section individnal to the called line and to each link, a guarding potential circuit for one of said links for making it busy while thetwo lines are connected, said guarding circuit and said controlling circuit using a conductor in common.

29. in a telephone trunking system, a calling line, a called line, a plurality of talking conductor links for connecting the two, a meter for charging the call to the called line and a controlling circuit for said meter having a section individual to each link, a ardlng potential circuit for one of said 1' for making it busy while the two lines are connected, said guarding circuit and said controlling circuit using a conductor in common.

30. In a telephone trunking system, a calling line, a called line, a pluralityof disconnected talking conductor links for connecting the two, a meter for char g the call to the called line and a control 'ng circuit for said meter having a sectionindividual to each link, a arding potential circuit for one of said links for making it busy while the two lines are connected, said guarding circuit and said'controlling circuit using a conductor in common.

31. in a tele hone trunking system, a calling line, a ca ed line, a plurality of normally disconnected talhng conductor for connecting the two, a meter for char ing the call to the called line and a contro. l' a circuit forvsaid meter having a section individual to each link a guarding potential circuit for one of said links for making it husy while the two lines are connected, said guarding circuit and said controlling circuit using a conductor in common 32. in a telephone trunhng system, a 1 line, a called line, a plurality of normally disconnected connec 1 the two, a meter individual to the a line and a controlling circuit for said meter ..=.."o. a section individual to the a meter individual to the called line and a controlling circuit for said meter having a section individual to the called line and to each link, a guarding potential circuit for one of said links for making it busy while the two lines are connected, said guarding 30 circuit and said controlling circuit using a conductor in common.

ln a telephone trunking system, a calling line, a called line, a plurality of talking conductor links for connecting the 35 two, a meter for char 'ng the call to the called line and a controing circuit for said meter havin a section individual to each link, a ar mg 'otential circuit for one of said lin lines are connected, said guarding circuit and said controlling circuit using a conductor in common, said uarding circuit being separate from the tal in conductors.

35. In a teleplione tru ing line, a called line, a plurality of disconnected talking conductor linksfor connecting the two, a meter for char g the call to the called line and a controfiiiig cirfor ma g it busy while the two 91} a system, a call- 95 cuit for said meter having a section individual to each link, a guarding potential circuit for one of said links for making it busy while the two linesare connected said guarding circuit and said controlling circuit using a conductor in common, said guarding circuit being separate from the talking conductors.

36. In a telephone trunking system, a calling line, a called line, a plurality of normally disconnected talking conductor links for connecting the two, a meter ior char 'ng the call to the called line and a control ing circuit for said meter having a section lndk' vidu al to each link a guarding potential circuit for one of said links for making it busy while the two lines are connected, said guarding circuit and said controlling circuit using a conductor in common, said guarding circuit being separate from the talking conductors. V

37. In a telephone system, a callin line a called line, a manual cord circuit an an automatic progressively movable switch link for connecting the two lines, a meter for charging the call to the called line, a controlling ircuit for said meter having a section individual to each link, and a circuit controller for said control circuit at the cord whereby the operator may operate the meter over the control circuit.

- tion in link and o circult controller for semi con 9. called line,

7 38.111 a telephone system, c cellinc line 9, celled line, a menuel cord circuit not: en an outcmoticprogressively movelole switch link for connecting the two linee, e meter individual to the celled line e controllin, circuit for said meter having c, section ind1- vidual to each link, and e circuit controller for said control circuit "at the cord whereby the operator may operate the meter over the control circuit.

39. In e telephone system, c cellino' line, a coiled line, o monucl cord. circuitelirilr and en automaticprogressively movable switch link for connecting the two lines, o meter tor charging the cell to the cellerl lineQe conil'Olllllfi circuit for said meter hering e eec ividuol to the called line end to etch trol circuitet the cord Wherebfir the operator may operete the meter over t e controlcircuit V 40. In it telephone system, c cellino line, 21 called line, it mcnuel cord circuit ii and an automatic orogressivelymovehle switch link for connecting the two lines, a meter individual to the called line, a controlling circuit for said meter vicluel to the called. line and. toicech link,

and a circuit controller for scicl'cnntrol cire cuit at the cord whereby the operator may operate the meter over the control circuit.

1 41. In a telephone system, e calling line, it manual cord circuit link end an automatic progressively movable switch link for connecting the two lines, seicl links normally disconnected, e meter for charging having c section indiweenie the cell to the celled line and o controllin circuit for said meter hoving e eection indie viciuel to each link, and e circuit controller for said control circuit et the cord whereby the operator rnoy operetethe meter over the control circuit. 7

42, In a; telephone system, a line, a. seconi line, o plurality of trunks terminating cech in on automatic progressively movable switch, eech trunk enclcorreeponding switch constituting a link, said linehcving access to eny one of said; links, a plurality of other trunks terminating each in en eutonietic progressively movable connective switch,

each one of said other trunks and its cor res ending connective switch constituting a lin c, any trunkin switch having access to any one of said oti or links, o meter for'the second line, energizing circuits for said meindividuel to the second line and a branch in each of said second links, circuits for controlling the energizing circuits, the con-,

ter, seicl energizing circuits having a section V

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