US1475612A - wicks - Google Patents

Description

Nov. 27, 1923. 1,475,612

J. WICKS MEASURED SERVICE TELEPHONE SYSTEM Filed Dec. 13 1919 2 Sheets-Sheet 1 Hllll [z'zuEnZ/Jr Juhn Ill mks Nov. 27, 1923.

1,475,612 J. wlcKs MEASURED SERVICE TELEPHONE SYSTEM Filed Dec. 13, 1919 2 Sheets-$heet 2 [nusnlur Jul-m Inficks H Ty:

Patented Nov. 27, 1923.

UNITEI) STATES PATENT OFFICE.

JOHN WICKS, CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MEASURED-SERVICE TELEPHONE SYSTEIJI.

Application filed December 13. 1919.

T0 aZZ whom it may concern Be itknown that I, JoHN VICKS, a citizen of the United States of America, and a resident of Chicago, Cook County. and State of Illinois, have invented certain new and useful Improvements in liIeasured-Service Telephone Systems, of which the following is a specification.

My invention relates in general to meas ured service telephone systems but more particularly to methods of providing measured service in automatic telephone systems; and the principal object is the provision. in an automatic system comprising well known types of pay stations and means for controlling the same automatically to collect and refund deposited coins, of means whereby the paystations may be controlled by operators in special cases, as where a subscriber calls a long distance operator and is connected div rectly with another subscriber in a distant exchange, this type of connection being commonly referred to as two number call.

Further objects consist in the provision of substation meters for registering calls. which are adapted to be operated by the same mechanism and in the same circuni stances as is the coin collecting or pay station apparatus above referred to; and in the provision of various improvements in ci1= cuits, all of which will be described in the following specification, reference being had. to the accompanying drawings forming a part thereof.

Referring to the drawings comprising Figs. 1 and 2, the general layout of the systcm therein disclosed may be described as follows: The two substations A and A" shown in Fig. 1 are automatic substations which, except for the associated i'ncasured service equipment, are of the usual type and are each provided with talking apparatus and an automatic calling device or impulse sender. Substation A is provided, in addition, with a well known type of coin collecting apparatus such as is in wide use by the so called Bell Telephone Company throughout the United States. Substation A is provided with a meter for registering calls which is controllable by the same agencies which control the coin collecting}; equipment at substation A, but which nevertheless is Serial No. 344,882.

believed to have certain features of novelty which will be pointed out. As shown in the drawing, both substations are connected in bridge of line conductors 21 and 22. Of course, each substation may have its own individual line, and it is to be understood that the invention is not primarily a party line system; but inasmuch as the substation equipment is adapted for use on party lines if desired, the two substations have been so shown for convenience.

The line conductors 21 and E22 terminate at the exchange in the individual line switch or trunk selector C, which is of the. well known rotary type where the wipers always remain onthe contacts last used, and whose function is to extend the line when calling via an idle trunk line to a first selector switch. One of the trunl: lines to which the line switch C has access is shown extending to the first selector E, 2. The relay equipment in Fig. 1, which is indicated by reference character D, is a repeater, there being one such repeater inserted in each first selector trunk.

The first selectors are the first in the series of numerical switches, which may com rise first selectors, second selectors, and connectors, which are used to complete connections between calling and called lines. Reference characters F and I indicate. respectively, a second selector and a connector. [inch switches are well understood and on this account it has not been thought necessary to show the complete circuits.

It is customary in automatic exchanges to set aside a certain level of the first selectors for calling the long distance operators, the tenth level being generally reserved for this purpose. Thus the selector E in Fig. 2, has access through its lower levels to groups of trunks extending to second selectors, one of which is the selector F, and has access through its upper or tenth level to a group of trunks extending to the long distance switch-board. One of these latter trunks is shown in the upper half of Fig. 2 as terminating in the manual equipment 6 which comprises a group of relays and a set of lamps, keys, and a ack multipled at two 0pcrators positions. Each position is supposed to be equipped with cord circuits (not shown) whereby connections can be made with the long distance lines.

In accordance with the best practice long distance connections to relatively near points where direct toll lines are available are established directly by the operator who receives the call, and the calling subscriber does not have to hang up his receiver and wait to be called back. These are the so called two number calls so denominated because on the single ticket, which is made out by the operator at the originating end, the only data customarily noted down is the number of the calling subscriber and the number of the called subscriber. In the case of fiat rate subscribers the tickets may be collected monthly, but in the case of measured service subscribers the charges must be assessed or collected at once, and the 1' i 1 l 1 recording operators thereroie must be p10- vided with means whereby they can control the subscribers meters or coin collecting apparatus. My invention provides such means, the operation of which will now be described.

Before proceeding with the explanation, reference is made to the following patents, which indicate the state of the art, and which are relied onto supplement the disclosure in the drawings:

U. S. patent to Keith, N0.1,279,352.

U. S. patent to Forsberg, No. 1,043,219.

U. S. patent to Lamb, No..1,193,160.

U. S. patent Keith, Erickson and Erickson, 815,321.

U. S. patent Keith, Erickson and Erickson, 815,176.

U. S. patentto Powell, No. 1,303,553.

In order to explain the control of the meter at substation A" by the repeater D the operation of the circuits in the establishment of a local connection will first be explained. For this purpose it will be assumed that the subscriber at substation desired to obtain connection with the subscriber at substation A When the receiver is removed at substation A a circuit is completed for the line relay 23 of the line switch C as follows: ground at G resting contact of armature 28 and the said armm lure, line conductor 22, transmitter T, receiver R, impulse springs o callingdevice make contact of the switch hook H and he said switch hook. line conductor 21, armature 26 and its resting contact, ttlldtl'l!) winding of the line. relay 23 to battery. The line relay is energized over the above circuit andupon attracting its armature completes a circuit which extends through the windings of the switching relay 2&- and the stepping magnet in series to battery at the tone busbar 31. At the same time relay 23 connects the test wiper 36 to the above circuit at a point midway between the switching relay and the stepping magnet.

' is removed the energization of the lire The operation now depends upon wh t. the trunk line with which the wipers oi line switch C are associated is or If the trunk line busy the with which the test wiper ment will be grounded and as a switchmg relay 24.- will be Sll( l'ifi=l(i ed were standing as shown in the drawiir-L in connection with the trunlc line enter 11g to the first selector and we in assume furthermore that this trunk line was idle. Under these circumstances when the rece Irv-1*:

23 is followed immediately by the cmtion of the switching relay 2a, which is of su'iiiciently high resistance to prevent the energization of the stepping magnet; and as a result of its 'zation the switching relay disconnects the line conductors 21 and 22 from the windarmature contacts controlled by the relay 531 of the repeater D to the windings (i:

coil (32,

relay 53 and the impedance respectively.

Following the extension of the above described by the operation. o switch (l, the line relay 53 of the i fiidBlll'Ql energized over the line circu and at its armature 69 completes a circuit the slow acting relay 5d. Upon attra ture 72, relay :34: completes a slow acting relay which upon one completes a holding circuit for the switch i relay 24 of line switch C as follows: at J working contact of mature the said armature, winding 7) of the tion coil, conductor 91., test wiper arniature 27 and its working contact, wind the switching relay 24, and the winding of the stepping magnet 25 to battery.

It is understood that the above holding circuit is established before the slow acting line relay 23 has had time to dcenergiae. The operation of armature 74; of relay 55 also closes a circuit for the polarizing windings of the electro-polarizcd relays .59 and but the polarizing windings are of high resistance and few turns, and the said relays therefore are not operated at this time.

.Vhen the line relay of the repeater was energized it closed at its armature a circuit for the line relay 101 of the first selector E which may be traced as follows: ground at G, lower winding of the line relay 101, resting contact of armature 113 and the aid armature, trunk conductor 95, working contact of armature and the sad armature, winding 8 of the induction coil, winding of relay 57, winding of relay 58, lower winding of relay 59, armature 80 and its resting contact, resting contact of armature and the said armature, trunk conductor 93, armature 112 and its res ing contact, and the upper winding of line relay 101 to battery. Upon energizing, the line relay completes a circuit for the slow acting release relay 102 in the usual manner, which upon energizing in turn, connects ground to the release trunk conductor 94, at its upper armature, and at its lower armature prepares a circuit for the vertical magnet 106. The apparatus at the central otlice is now ready for the reception ofthe plurality of series of impulses which the calling subscriber at substation A now proceedsto generate through the medium of the calling device S in order to complete the desired connection. Before considering the operat on of the selector in response to the first series of impulses the operation which takes place at the substation A will be briefly explained. When the calling device dial is rotated in accordance with the first digit, soon as it leaves its normal position the shunt springs 6 are closed, with the result that the transmitter T and the receiver R are short-circuited as usual, and with the additional result'that a circuit is completed for the relay 2 as follows: ground at C"- winding of the said relay 2, lower set of contact springs controlled by the said relay, switch hook contact springs 5, middle and upper shunt springs, impulse springs, and make contact of the switch hook H and the said switch hook to the line conductor 21, whence it extends to the exchange and by way of the upper conductor of the line circuit thru the winding of the line relay 53 of the repeater D to battery Upon energizing, relay 2 locks itself mechanically and breaks its own circuit. By the closure of it upper set of contacts, relay 2 also completes a connection from the line conductor .22 thru the windings of the polarized relay s1 and the operating magnet 01 the meter M to ground. Thus the meter is put in condition to be operated subsequently to register the call. It should be stated that the circuit thru the polarized relay 4 and the meter magnet is of very high resistance and does not afi'ect the transmission of impulses, or the talking qualities of the circuit.

Returning now to the consideration of the operation of the central office equ pment, when the calling device is operated in ac rcrdance with the first digit of the number series of interruptions is produced in the l ne c rcuit, thereby producing a series of deenergizations of the line relay 53. At its armature 69 and resting contact thercoi the line relay closes a circuit each time it decnergizes tor the slo Y acting relay which relay -s energized the first time its circuit is closed and remains energized while relay is operating responsive to the interruptions in the line circuit. In its energized position relay 56 connects ground G to the lower line conductor, thereby short circuiting the impedance coil 62; and also connects the trunk conductors 9? and 95 over a direct path which includes only the armature 75 and its working contact and the armature 70 of the line relay 53 and its working contact. By this means all unnecessary resistance and impedance is removed from the circuits over which impulses are transmitted to operate the se lcctor E, and the other switches to be used in establishing the connection.

lici-iponsive to the interruptions produced in its circuit by the intermittent retractions ot armature 70 ot' the line relay 53, the line relay 101 of tho first selector E is intermittently dcenergized a plurality of times and at each dcenergization sends an impulse thru the vertical magnet 106 to battery. The slow acting relay 103 which is in series with the vertical magnet is energized by the first impulse and retains its armature attracted while the vertical magnet is being operated. At the first upward movement of the shaft a circuit is completed from the grounded release conductor 94 thru the make contact of relay 103 and thru the now closed oil normal contacts 108 to the ste 'ng relay l.0-l, which upon energizing, closes a locking circuit for itself at its upper pair of contacts. At the end of the vertical operation of the switch the slow acting relay 10 5 is dcenergized, thereby closing a circuit tor the rotary magnet 10?), this circuit being readily traceable by way oi the lower set of contacts controlled by the stepping relay 104-. which is now energized. Upon energizing, the rotary magnet operates to advance the wipers 120-122. inclusive, into engagement with the first set of bank contacts in the level opposite which they were raised in the vertical movement of the switch, and also breaks the locking circuit of the stepping relay 10st. Relay 10 1 therefore dccnergizes and breaks the circuit of the rotary magnet, which accordingly reli'nwifi its armature and again closes the in errupter contact controlled thereby. The ope: ion now depends upon whether the test wiper 121 is in engagement with a busy test contact or not. t the test. contact with \vhirh the wiper 121 has made connection is busy it will be grounded and the stepping relay will again be energized over a circuit including contacts controlled by the switching relay 100. the interrupter contact controlled by the rotary magnet 105, and the Tie cuergization cppiiig l results in another closure of the circuit oi the rotary magnet, which advances the wipers into engageme: 5 with the next set of bank contacts. This :eration by which the stepping relay ill-l l the rotary magnet 105 are alternately ined and deenergized takes place very udly, and will continue until the tcs; "\Hper 121 arrives at a non-busy and grounded test contact. llissuining that i wipers of the switch were raised opposite to the level in which the terminals oi the line extending to the second selector located, and assuming also that this inc is the first idle trunk line in the 1 ion when the test wiper 12; arrives test contact 12% it will find no ground iotential and the stepping relay 104 will )t again be energized. Instead, the switchrelay d which was connected in series filth the stepping relay 10 i at the first upr. ard movement of the shaft and which until now has remained shortcircuLed will energize with the result that the trunk conductors 98 and. 95 are disconuec'tet from the windings of the line relay 10}. and are extended by way of armaturcs 112 and 113 and wipers 120 and 122 to the line relay (not shown) of the second selector F. The line and release relays of the second selector are accordingly energized over the line in the usual manner and the latter relay closes the usual holding circuit which extends by way of release trunk conductor 12?, test contact 124-, test wiper 121, armature 119 and its working contact, winding ot' the switchins: relay 100, interrupter contact of the rotary magnet, oil normal springs 108, and the winding of stepping relay 10 i to baty The latter relay remains inoperative because of the high resistance of the switchin relay. 'It will be observed that the release trunk conductor 9 1 which is grounded at the repeater D, also supplies ground to the holding circuit just described. This is o't no particular importance in the present case but is essential in case the selector E is used to call the long; distance switch board, the trunks to which are not provided with release trunk conductors,

The sul'iscriher at substation will now operate his calling device in ace lance with the remaining digits in the called number. Responsive to interruptions produced in the line circuit, and repeated by the repeater-D, the second selector F and the connector I are successively operated and the connection thereby completed to the cal.

\runk ed substation A". The operation of these switches is well known and has been eescribed in the publications previously reterred to and hence will not now be explained in detail. Upon the completion of the connection suitable ringing apparatus is automatically operated to int acts signal the subscribe at substation 1X hen the receiver is removed from the hook a circuit is completed for the back bridge relay 150 of the connector I and ti is rela upon energizing reverses the direction or current flow in the incoming trunk line in the usual and well known manner. Theeitect of this reversal of current at the repeater D will now be consicered. It has been pre iously explained that the bridge across the trunk conductors 93 and 95 includes the relays 5T, 58, and the lower winding of clectropolarized relay 59. The usual flow oi? current thru the bridge from the line relay ot' the switch ahead is su'liicient to energize relay 5? but not relay which latter relay is or low resistance nd also marp'inally adjusted. Also until t 1e c grant is *ersed in the trunk line by the response of the called subscriber. the windings of the electropolarized relay 59 are in opposition and this relay remains inoperative. lVhe toe current is reversed however the two windings assist each other and relay 59 is operated to close a circuit for the slow acting relay 52 as follows: ground at G, working con tact of armature 83 and the said armature, armature 81 and its resting contact, armature 64: and its resting contact and the winding of relay 52 to battery. Upon energizing, relay 52 establishes a locking circuit for itself at its armature 68, and at its armature 67 prepares a circuit over which. the h voltage battery B may be connec id to trunk conductor 92.

l Vhen the conversation is finished both subscribers will replace their receiver ll hen the receiver is hung; up at substation A the energizing circuit of the line relay of the repeater D is permanently opened and tl c said line relay is deenergized to open the circuit of the slow acting relay and the bridge across the trunk conductors 93 and 95. As a result of the latter operation the selector and connector switches sed in the establishment of the connection are released in the usual and well undcrs-stood manner. The breaking of the circuit of the slow acting relay 54 is followed by the dcenergization of this relay which thereupon breaks the circuit of the slow acting: rel y 55 at its armature 72, and at the estin rcoir tact of the same armature closes a circui t tor the relay 51 as follows: ground at armsture 72 and its resting contact; armature it and its working contact (relay 56 was enerp ized by the retraction of armature the. line relay), and the winding of the slow acting; relay 51 to battery.

The above described circuit is closed only for a short interval, for the circuit of relay 55 has already been broken and when this relay deenergizes it breaks the circuit of relay 56 which in turn will deenerg'ize to break the circuit of the slow acting relay 51. WVhile it is energized relay 51 connects ground to conductor 91 by means of its armature thereby preventing the line switch C from releasing; and at its armature (it connects the lower trunk conductor 92 by way oi the working contact of the said armature, armature '67 and its working contact. and the lamp L to the positive pole of the. high voltage battery B Current from battery l3 will now flow for a brief interval over the trunk conductor 92, line conductor 22. thru the contact springs controlled by relay 2 at the substation A, thru the winding of the polarized relay i, and thru the winding of the meter magnet to ground. The direction of the current flow as above described is such that the polarized relay 4; is not operated, but the meter magnet is energized and attracts its armature to register a call. At the same time the meter magnet also closes its contact springs 7, whereby the line conductor 22 is connected over another path by Way of the lower winding of relay 3 to ground. Relay 3 is accordingly energized in parallel with the meter magnet and upon attracting its armature releases or unlocks the armature of relay 2, with the result that the circuit thru the polarized relay i and the meter magnet is broken. The substation A is now in its original condition as it was before the call was initiated. except that the meter M has been operated to register the call. At the repeater D all relays have been deenergized except relays 51 and the latter relay being locked to the grounded conductor 91 which is maintained grounded at armature 65 of relay 51. When relay 51 deenergizes, therefore, following the breaking of its circuit by the deenergization of relay 56, relay 52 will be deenergized also and the repeater will be in its normal condition.

Having described the operation in the case where the called man answers his telephone, I will now describe how the meter is prevented from registering and at the same time is disconnected from the line when the receiver is replaced at substation A after an unsuccessful connection. It will be assumed that the connection has been extended as before thru the medium of the repeater D, first selector E, second selector F, and the connector I to the line of substation A and it will be assumed further that no response was secured and that finally the receiver was replaced at substation A. In this case, since the called subscriber did not answer, the electro-polarized relay 59 and the slow acting relay 52 will not be energized, and when the slow acting relay 51 is operated following the replacement of the receiver. the high voltage battery 13 instead of battery B will beconnected tothe trunk conductor 92 as follows: battery B lamp L resting contact of armature 79 and the said armature, resting contact of armature 67' and the said armature, and the working contact of armature 66 and the said armature to conductor 92. Current from battery B will now flow over the line conductor 22 and thru the polarized relay t and the magnet of meter M to ground as before, except that now the flow of current is in the opposite direction and the polarized relay 4 will be operated. It is well known that a polarized relay is extremely sensitive and will operate faster than a magnet having a heavy armature such as the magnet ot' the meter M. The polarized relay 4 therefore operates slightly before the meter magnet and at its left hand pair of contacts short-circuits the latter to prevent its energization, while at its right hand pair of contacts the line conductor 22 is connected thru the lower winding of relay 3 to ground. Relay 3 is therefore operated as before to open the circuit thru the polarized relay 4 and the meter magnet, whereupon the substation will have been restored to normal condition. The meter M has not been operated in this case to register a call, and should not have been, for the con nection was unsuccessful.

I will now describe briefly the process of obtaining a so called two number connection in order to explain how the meter at substation A is controlled by an operator. It will be assumed that the subscriber at sub tation A desires to obtain connection with a subscriber at some distantpoint connections to which are obtainable only with the assistance of a recording toll operator. It will be necessary then for the calling sub scriber to first establish connection with the operator by calling the digit 0 on his dial, after which the operator will extend the con nection to the desired line in any suitable manner. Assuming that the receiver has been removed at substation A and that the connection has been extended to the first selector E, when the calling device is operated in accordance with the digit 0 the selector switch is operated in the usual manner to raise its shaft step by step until the wipers 120-122, inclusive, stand opposite the tenth level of bank contacts. Thereafter the trunk selecting movement is initiated automatical- 1y as previously described and the wipers are rotated in search of an idle trunk line. Assuming that the trunk line shown in the drawing is the first trunk line found to be idle the wipers will be stopped in connection therewith, the private contacts of the 0 level being multipled with all corresponding 0 level trunks and of course are not grounded unless other selectors are occupying them, and the moment that an idle or ungrounded contact is reached the shunt circuit around relay 100 is removed, and the switching relay 100 will energize to extend the trunk conductors 93 and 95 by way of wipers 120 and 122 and conductors 140 and 141 to the upper and lower windings of the double wound line relay 203. respectively. There being no release trunk conductor extendingback from the operators position, the switching relay 100 is n'laintained energized by the grounded conductor coming from the repeater D. Upon the extension of the line to relay 203 the said relay is energized and completes a circuit thru the lamp L which is lighted to notify the operator that a call has been received. l l hen the operator notices the signal she will insert the answering plug or" one of t 1e cord circuits with which she is provided in the ja ck the same time throwing her listening key. Operators cord circuits and associated equip-- ment are well known in the art and hence have not been shown, as any suitable type of such equipment may used. When the plug is inserted in the jack. relay 205 is energized by ground over the sleeve of the cord circuit to open the circuit of the lamp L and also to break the circuit thru the upper winding of the line relay The result of this operation is tov the operator a distinctive audible signal indicating that the calling line is a measured: service line, which is produced in the following manner. Reverting to the repeater D it will be recollected that the bridge across the trunk conductors 93 and 95 includes the secondary winding 8 of the induction coil (unless short-circuited by relay 57). and the windings of relays 57, 58, and 59 in series. Under normal conditions current flow thru the bridge is such that only relay 5'? is energized, this relay having the function of short circuiting the secondary winding 5 of the induction coil. Now when the circuit of the line relay 203- at the operators position is broken current tlow in the bridge will be interrupted entirely and relay 57 will be deenergized, thereb including the secondary winding in the circuit. It will be observed that a circuit normally exists throughout the duration of the connection whi h extends trom ground G thru the primary winding P ot the induction coil and by way of trunk conductor 91. wiper 36. winding of switching relay 24, winding of stepping magnet hus-har 31, and the low resistance secondary winding of the signaling machine to battery. It follows that a high frequency tone induced in the secondary winding .9 which gives the operator an auaible signal. This indicates to her that the calling line is a n'ieasured service line. and it may be stated that all such lines have their stepping magnets, such as magnet 25, of their associated line switches connected to battcr at the tone husbar 31 instead of direct. It is necessary tor the operator to lmor-r when a measured service line is calling in order that she may operate the substation meter, or collect deposited coins in the case of a pay station, at the proper time.

Having perceived the audible signal, the operator will depress the tone cut-oil key momentarily thereby closing a circuit for the relay 204. Upon energizing, relay 204i locks itself at its armature 208, and at itsarmature 209 reestablishes the circuit extending from the line conductor 140 thru the upper winding of relay 203 to battery. As a result relay 203 and the relay 5'? at the repeater D are again energized, the latter relay short circuiting the secondary windings to cut the tone off the line. The operator will now obtain the desired number from the calling subscriber and will proceed to complete the connection. Before permitting the subscribers to talk however, the meter at substation A must be actuated the proper number of times to pay for the call and the operator will therefore actuate the key marked Collect accordingly. Each time the key is actuated a circuit is closed for the relay 202, which upon energizing substitutes the lamp L and high voltage battery B for the upper winding of the line relay 203 and the regular exchange battery. Although direction of current flow is not changed by the above operation, it is greatly increased due to the high voltage of battery B, with the result that the marginal relay 58 at the repeater D is energized. The operation ofrelay 58 results in the removal of the short circuit from the lower winding of electropolarized relay 60 and in the closure of the circuit of the slow acting relay 51. The lower winding of the electro-polarized relay 60 is now included in the bridge across the trunk conductors 93 and 95 and the direction of current flow is such that this relay is operated. Upon the operation of relay 51 a circuit is completed which extends from ground by way of the working contact of armature 71 and the said armature, armature 63 and its working contact and the winding of the line relay 53 to battery. The line relay 53 is thus maintained energized locally after it is disconnected from the trunk conductor 90 to prevent the release of the connection. Relay 51 also connects the battery B to the line conductor 92 as follows: battery B lamp L lower winding of relay 61, working contact of armature 8a and the said armature, resting contact of armature 67 and the said armature, and the working contact of armature 66 and the said armature to conduct-or 92. Curs rent from battery B now flows over the line conductor 22 to substation A and operates the meter M as before to register a call. The meter is not disconnected from the line however, due to a circuit which is completed to the upper winding of the relay 3 as follows: line conductor 22, transmitter T, re

cciv hf. innmlse prings oi the calling dec 5 make contact ol the switch hook H and the said switch hook. contact springs 8, and fl c upper winding; of relay 3 to ground. The above cir uit is closed at the same time that the circuit is closed thruthe lowerwinding of relay 3- and since this relay is differentially wound it not energized and the. armature at relay 2 is not unlocked. It follows that the meter and polarized relay 4: remain connected to the line and the meter will be actuated as man times as the operator actuates her collect key. It will be noticed that the circuit over which the meis operated includes the lower winding relay 61 and in case the circuit is cometc at the substation the relay 61 will enc 'ize each time that the battery 13 is connccted to the line at the repeater. As a result the conductor 95 is grounded. thereby short circnitinn' the lower winding of the line relay 203 at the opcrato1"s position. The line relay is accordingly deener zized and closes a circuit for the lamp L the illumination or which indicates to the operator that the meter at the calling substation is being operated. because it for any reason the meter has not been connected to the line the c rcuit to ground at the substation would be cpenv relay 61 would not energize. the line relay 203 would not 'i" all back. and the lamp would not be lic'l d. Although as stated this lamp indicznes to the operator that the meter is being operated correctly. or rather is properly connected to the line for operation, its chic'l use is to ndicate to the operator. when the callingline is a pay station line. that the calling subscriber has deposited a coin. Further mention of this will be ma dc hereinafter.

Having mace, the proper charge for the call as above described. the operator will per uit the conversation to proceed. When the subscribers have finished they will repla e their receivers and a suitable means of supervision in the operators cord is controlled in the proper manner to give the operator a disconnect signal and she will theretore pull down the connection. mien the receiver is replaced at substation A the line relay 53 ot the repeater D is deenergized and as a result the selector is restored to normal and relays 541- and oi the repeater are deener c izcd. As before explained the deenerc-ization of these two relays brings about a temporary energization of the relay 51 oi the repeater which operates to connect the battery B to the conductor 92 for a hriei interval. thereby bringing about the disconnection of the polarized relay 4 and the meter trom the l ne before explained.

In view at the 'tc-rcfmino' explanation of the manner in which a. substation A is controlled in ler lili crciit a r-cumstances it is believed that it will be unnecesear to enter into a detail description of the ope ation oi the pay station equipment at substation A. The substation A comprises an ordinary automatic telephone and a pay station of well known type which is described in. the U. S. patent to Forsberg. Ito. 1,043,219, previously mentioned. The only change is in the circuit of the contact springs. which are so connected that the impulse springs of the calling device 5 are normally short circuited, from which it will appear that it will be necessary for the subscriber to deposit a coin before he can make a call. When calls are extended to local subscribers the collection and rcfunding oi the deposited coins is controlled :uitomatically by the repeater D which applies either positive or negative high potential to the line to actuate the polarized. magnet. at the pay station to either collect or refund the coin, depending on whether the call has been answered or not. The operation is identical so far as the exchange :wparatus is concerned as it is in the case where the substation A is concerned. and 'a view oi" the tact that the operation at a pay station oi this type when coins are being collected or refunded is well understood, it is believed that further description ol the operation on automatic connections will be unnecessary.

ll hen long: distance connections are established with the aid of the operator. deposited coins are oi course collected responsive to the actuation of the collect key by the operator which results also in the application of high voltage current ol? suitable polarity .to the line. In case it is desired to retund deposited coins it is not necessary for the operator to take any action in order to accomplish this under ordinary circumstances because when the calling subscriber hang-s up his receiver any coins which remain uncollected will be automatically rei'undcd by the operation oi the repeater D during the release oi the connection. How ever. it may happen that the subscriber by mistake has deposited the wrong coins. In this case it will be desirable to refund the coin without requiring the subscriber to hang up his receiver. with a view to his depositing the correct coin immediately thereafter. To accomplish this the operator will actuate hcr key marked lie't'uni'l. thereby energizing her relay Zlll. its a result. the high voltage battery l3 and the lamp ll are substituted tor the uppe windcl relay 203 d the exchange battery. operation is szn'iilar lo the operation l whereby battery B w- 1 i cult and is iollmved by simi at the repeater l). cxceptthat A e the current ti thru the bridged r a the 1=";)9i-.. i in the rcrerae direcy :3 lion, the electro-polarized relay till will not lit) oquiineiii as A uppci Gl. resting Contact o i? armaiiirc o1 gmai irm resting Contact of arnia l li- "1 arinal'iire, and the worlcv' l: o armafure (36 and rho contac A 4 i. sa' a fare to cowhx The current itrol line C(lllfll'lifi j V W tion (0 open 1 ay slai'ioii so a lVhci'l coins or; 1 ed relay 61 is opcri: ml each 0'? course that coin l posited and the polar oiincci'od jo the line, i'licroh niiori'nsd "hr-. ing is actually H I v hility of her being imposed upoi scribe]? Who mi -i', alilompt io ohii motion with-omit dsao vented. V 1

Having dcscrihcd my ilIFCBtlOD What I a conneci'ioir consider to be new and desire so have pro- Second liec-i'ed by Lotte. s Pricnt will be poinied out 001111661 in the appended claims.

l i hat claim as my invention is:

couion to which coimcw liner 2 eifiPll callwl 1 connccl'io'a can only 1):),

GIIiZGi d cal lm or 11c (21c (343 suing a (on; pio- 1. In a telephone Sfv'S 'C a :2 calling i: J l a and a line thercifoii' crztsndihg o i in g mower ,urroil: cs oppositc po excl!ange. charging cquipmcni, s 'iiy a: the citch swans at Mo c1;- i ioa inchfidiiig a polaritaso rolzi .7 change operable i cull from said ho connected to rho liilc {or coil? s :iioii lo anioniai'icnllr connect on 1'" iihc l oi ihc llllm said operation of so:

liormallv res: in current iroin mar/i0 sWil'ch-os b i from said station I M osho source and ii 2 cmonian'o to only to an OPQ'FZITOTE position as wherei th, one oz: said sources 5o 1;); the ac 'uaoperator may coinploic tho connection to called station, currentsonrcos of opposiic polarity and moans whereby lhe operator Whilo main. aiming; the commotion can conii n of said mescr.

" i telephone svs;

iih an olsci'r ncct either of said sources to i118 calling oi? s2 hoe To control sasd iolay dosh-ml. a call is 2. lo a iOlPPl'HPlG systciii. a calling g ounded and a lino i hc ci' or cxiioi 'ng lo a ofichango for opor: exchang o ing cquipiiici ii at sand staisicr The (all and (ion iric ud oolarizccd ii och adapic rospoiisiro to il o Cori-mil lirol iii has oncratcd.

the opcrai'ioo oi? said c. automai'io swrtc ig lrollahle from sau conneoiioii lo a or:

1 V 11 a lmeoh no a snlisialior r i i A sided with a motor. means i or airi'oiii:

li'a meeting said motor ,roro mind when (all is (.XCllElllQC 'i-or connecting 'sristic jlll'lQiTi sources 5' 4'1 subscriber, (QTY-Chi soiirci-is or iarity, moans opsratcd zauiomzii' c the connection ha heart or lo station to thorsa of said sources to rho c: 0pc *aiic said char ii the operation lliorm iior s. ozisivc iii cii'hor caso V V sire only to a particular load of car; i

t ng; the: operation oi? sa'd ITIQiQL callii solifliccalled subscri iier .ii a tolcphoiio system, manual cqiiiprxient whcrohy a. coiiiioci'io il'ltloll COlDPIlSlUg ia equipment call automatic s .i!'cl=os sender for station,

, and a meter, the exchange controlled by said completing; conneczzon i'o called line iio l he o eraa second operaiioi' fended i said callii tors position may be completed io means for operating said meter when the callin subscriber hangs up his receiver, a. relay for preventing the operation of said meter, and means for operating said relay when the calling subscriber hangs up his receiver in case the called subscriber did not answer.

8. In a telephone system, a substation pro vided with a meter for registering calls, means for automatically connecting said meter to the line when a call is made, two current sources or" opposite polarity at the exchange, n'ieans operable. after each call to connect one or the other oi said sources to the line, and a relay controlling said meter whereby the said meter is permitted to respond to current from only one of said sources.

9. In a telephone system, a substation provided with a meter for registering calls, means for connecting said meter to the line when a call is made, two current sources of opposite polarity at the exchange, means operable after each call to connect one or the other of said sources to the line, a relay controlling said meter whereby the said meter is permitted to respond to current from only one of said sources, and a second relay responsive to current from either of said sources to disconnect said meter.

10. In a telephone system, a substation provided with call registering mechanism, current sources of opposite polarity at the exchange, means for connecting said mechanism to the line when a call is made, means at the exchange operable after each call to connect one or the other of said sources of opposite polarity to the line, said mechanism being responsive to current from only one of said sources, and means responsive to current from either of said sources to disconnect said mechanism from the line.

11. In a telephone system, a substation and a line therefor extending to a central exchange, registering mechanism including a polarized relay connected to the line when calling, a non-polarized electromagnetic nictcr controlled by said relay, sources of current of opposite polarity at the exchange for controlling the operation and disconnection of said mechanism, automatic switches con trollable by the subscriber at said station for extending a connection to a called line, and means whereby one or the other of said sources is automatically connected to the calling line after each connection.

12. In a telephone system, a substation and a line therefor extending to a central exchange, registering mechanism including a polarized relay connected to the line when calling, sources of current of opposite polarity at the exchange for controlling the operation and disconnection of said mechanism, automatic switches controlled by the sub scriber at said station, an operators equipment cooperating therewith to extend a connection to a called line, and means whereby the operator can connect either of said sources to the calling line to control said registering mechanism as desired.

l3. 111 a telephone system, a substation and a line therefor extending to a central exchange, registering mechanism including a polarized relay connected to the line when calling, sources of current of opposite polarity at the exchange for controlling the operation and disconnection of said mechanism, automatic switches controllable by the subscriber at said station for extending a connection to a called line, means whereby one or the other of said sources is automatically connected to the calling line after each connection, a magnet responsive to the connection of either source to disconnect said mechanism from the line, and another magnet controlled by said relay and responsive to the connection of a particular one of said sources to register a call before the mechanism is disconnected.

ll. In a telephone system, a substation and a line therefor extending to a central exchange, registering mechanism including a polarized relay connected to the line when calling, sources of current of opposite polarity at the exchange for controlling the operation and disconnection of said mechanism, automatic switches controlled by the subscriber at said station, an operators equipment cooperating therewith-to extend a connection to a called line, and means whereby the operator can connect either of said sources to the calling line to control said registering mechanism as desired, the connection of either source being effective to disconnect said mechanism from the line, and the connection of a particular one of said sources being effective to register a call before the mechanism is disconnected.

15. In a telephone system, a substation and a line therefor extending to a central exchange, registering mechanism including apolarized relay connected to the line when calling, sources ol current of opposite polarity at the exchange lor controlling the operation and disconnection of said mecha nism, automatic switches controlled by the subscriber at said station, an operators equipment cooperating therewith to extend a connection to a called line, means whereby the operator can connect either of said sources to the calling line to control said registering mechanism as desired, the connection of either source being effective to disconnect said mechanism from the line, and the connection of a particular one of said sources being efi'ective to register a call before the mechanism is disconnected, and subscriber controlled means for preventing the disconnection of said mechanism whereby it may be ope 'ated a plurality of times] 16. In a telephone system, a subscribers station, a registering mechanism connected to the line when calling, sources or current of opposite polarity at the exchange, means for connecting one or the other of said sources to the line to control said mechanism either before or after the receiver is replaced, and means responsive to either source only after the receiver has been replaced to disconnect said mechanism.

17. In a telephone system, a calling station and a line therefor extending to a central exchange, call registering equipment at said station including a polarized relay adapted to be connected to the line for controlling the registering or extended calls, automatic switches at the exchange controllable from said station lor extending connection to an operators position, means whereby the operator may complete the connection to a called station, current sources of opposite polarity, means whereby the operator can connect either of said sources to the calling line to control said relay as do sired, and a signal at the operators position actuated during the control. of said relay when a call is being registered to notify the operator that the call registering equipment is being operated.

18. In a telephone system, a subscribei"s station, registering mechanism at said sta tion for registering calls including a polarized controlling relay, said mechanism being connected to the line when calling, auto matic switches for extending the call to an operators position, sources of current of opposite polarity, means controlled by the operator for connecting one or the other of said sources to the line to control said registering mechanism, and a signal for indicating to. the operator whether the said mechanism is connected or not.

19. In a telephone system, a substation having call charging equipment, current sources of opposite polarity at the exchange, means at the exchange operable after each call from said station to automatically connect one or the other oi said sources to the line, said call charging equipment being non mally responsive to current from either source, and. means responsive to current from only one of said sources for prm'enting the assessing operation of said charging equipment.

20. In a telephone system, a substation and a line thereto!- extending lo a central exchange, a toll assessing device including a polarized relay connected to the line when calling, sources of current of opposite polarity at the exchange for controlling the operation and disconnection of said device, automatic switches controllable by the subscriloer at said station for extending a connection to an operators position, means controlled therefrom for extending a connection to a called line, and means at said operators position whereby one or the other of said sources of current may be connected to the calling line at will.

21. In a telephone sys em, a subscribers station, registering mechanism at said. station for registering calls including a polarized controlling relay, said mechanism being connected to the line when calling, automatic switches for extending the call to an operators position, sources of current of op posite polarity, means controlled by the operator for connecting one or the other of said sources to the line to control said registering mechanism, and a signal .ior indicating to the operator whether the said mechanism is connected or not, said signal and reg-- istering mechanism operable any desired number of times while maintaining said connection.

22. In a telephone system, a subscribers station, automatic switches controlled by the subscriber at said station for extending a connection to an operators switchboard or to another subscribers line, means at said switchboard for manually completing received calls to called lines, a call register at said station connected to the line when ever a call is made, means for automatically operating said register over the line circuit to register automatic connections, or for op erating the register under manual control to register manually completed connections, and disconnecting means effective to disconnect said register from the line whenever it is operated automatically while permitting repeated. operation under manual control without disconnection.

23. In a telephone system, a subscribers station, means at the exchange for extending calls from said station to called lines, a call register at said station connected to the line when a call is made, means for controlling said register over the line from the exchange to register calls, and means effective only in case the receiver at said station has been replaced for disconnecting said register from the line whenever the same is operated.

M. The combination, with a substation meter, of means for connecting said meter to the line when a call is made, a circuit independent ol? the s\\'itchhool: :lor ruperating said meter over the line, a magnet. for dis connecting said meter lrom the line, and a circuit elfective for operating said magnet only when the switchhook is in normal position.

25. The combination, with a substation meter, of means at the exchange for transmitting currents of two different characters over the line, the meter being normally rcsponsive to current of either kind, and a relay associated with said meter at the substation and responsive only to current of one kind for preventing the response of the meter when such current is received.

26. The combination, with a substation meter, of means at the exchange for transmitting currents of two different characters over the line, the meter being normally responsive to current of either kind, and a relay associated with said meter at the substation and responsive only to current of one kind for preventing the response of the meter when such current is received, said relay having contacts for shunting said meter to prevent its operation.

27. The combination, with a substation meter, of means at the exchange for transmitting currents of two different characters over the line, the meter being normally responsive to current of either kind, and a relay associated with said meter at the substation and responsive only to current of one kind for preventing the response of the meter when such current is received, said relay being connected in series with said meter and having contacts effective to short circuit said meter when closed.

28. The combination, in an automatic substation equipment, of a meter, a magnet responsive to the actuation of the calling device for connecting the meter to the line, locking means for maintaining the connection independent of said magnet, means for operating the meter over the line from the exchange, and an unlocking magnet also controlled over the line from the exchange for disconnecting the meter from the line.

29. The combination, in an automatic substation equipment, of a meter normally disconnected from the line, means responsive to the setting of the calling device for the first digit of a called number for connecting said meter to the line, and locking means for maintaining the connection after the calling device is restored.

Signed by me at Chicago, Illinois, this 8th day of December, 1919.

JOHN WICKS.

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