US2374964A

US2374964A - Telephone system

Info

Publication number: US2374964A
Application number: US460527A
Authority: US
Inventors: John G Walsh
Original assignee: Bell Telephone Laboratories Inc
Current assignee: AT&T Corp
Priority date: 1942-10-02
Filing date: 1942-10-02
Publication date: 1945-05-01
Anticipated expiration: 1962-05-01

Description

May 1, 1945. J. cs. WALSH TELEPHONE SYSTEM Filed Oct. 2-, 1942 5 Sheets-Sheet 1 h 1+ 81 j 1 3 k. 3 M w a \3 5 3. R8 E23 $8 $3 @3533 a s U\.\ SEEM 38 \mmmw INVENTOR J G. WALSH ATTORNEK May 1, 1945. J. G. WALSH 1 2,374 964 TELEPHONE-SYSTEM Filed Oct. 2. 1942 5 Sheets Sheet 2 I59 /60 2 -co//v CONTROL CONNECTOR CIRCUIT INVENTQ)? J. a. WALSH fiaad FIG. 3

May 1, 1945.

J. G. wA| s|-| TELEPHONE SYSTEM Filed Oct. 2, 1942 5 Sheets-Sheet 3 INVENTOR J. G'WALSH A TTORNEV May 1, 1945 J. G. WALSH TELEPHONE SYSTEM 5 Sheets- -Sheet 4 INVENTOR By J a WALSH 0i. (9 CM ATTORNEY Filed 001:. 2. 1942 E kSuSu g @333.

May 1, 194-5.

.1. G. WALSH TELEPHONE SYSTEM Filed Oct. 2, 5 Sheets-Sheet 5 |l|| l li @Su 1 J; c. WALSH- A T TORNE V Patented May 1, 1945 UNITED STATES Application October 2, 1942, Serial No. 480,527 I is Claims.

This invention relates to telephone'systems and particularly to automatic telephone systems comprising subscribers stations of the coin prepayment type.

Objects of the'invention are an increase in the efficiency of disposing of coinsdeposited at prepayment coin stations in automatic telephone systems and the improvement of circuit means provided in such systems for disposin f coins on calls completed through an operators position. i

According to the invention means are provided in an automatic telephon system comprising subscribers stations of the coin prepayment type whereby a connection is established with a calling line and eithercoin collector coin return battery is connected to the line under the control of the dial orother impulse sender at an operators position, through which a ,call from said station has been completed, to dispose of the coin deposited at the calling station.

One feature of the invention is the provision of means including a coin control connector for establishing a connection with the line of a calling station of the coinprepayment type under the control of a dial or other impulse sender at a toll operatorsposition through which a call from said station has been completed, the collectl'on or return of the deposited coin being effected'by a selective operation of the operator's impulse sender.

Another feature of the invention is the provision of means including means individualto the line of a subscribers station of the coin prepayment type for openingthe talkingconnection 1 effected underthe selective control of a dial or 1 other impulse'sender at the operators position.

A clear and complete understanding of the invention will be facilitated by describing a system in which the various features of the invention are embodied, such a system being represented schematically in the drawings which form a part of this specification. The invention is, however;

not limited in its application to the system disclosed in the drawings but is generally applicable to automatic telephone systemscomprising subscriber stationsof the coin prepaymenttype. Referring to the drawings: 7 Fig. 1 shows a coin subscribers station A, line Ll, auxiliary linejcircuit nLCi, and line-circuit board; and i N Fig; 6 shows the relativepositionsin which LCI, ajline finder LFI and a connector oi; Fig. .1 also shows a secondselector s2, a connector G2, a line L2 and'acalled ubscribers stationBj i Fig: 2 shows a coin control connector circuit 5CCC; f I

Fig. 3 shows a coin control trunk circuit CTI'; Fig. 4 showsa first selector Si individual to the coin control trunk circuit CT] of Fig. 3' and line finder LF'I ,of Fig. 1; Fig. 4further shows 10 an, auxiliary trunk'circuit ATI and an incoming selector IS'I; i i

Fig: 5 shows a two-way trunk circuit 'I'WTI connecting the trunkcircuit ATI and selector IS of Fig. 3 with an interofilce trunk 'Tl Fig. 5 .15 also shows an auxiliary trunk circuit ATZ, in-

TWTZ associated with an; interofllce trunk T2; and shows trunk circuits TW'I3 and TWTl ter-' minating trunks TI and. T2 at a manual switch- Figs. 1 to 5 are, to be placed to'form an operative arrangement. 1

The subscribers stations A and "B are of the usual type provided in common battery, automatic exchanges. Station A includes a dial 8 for use in establishing desired connections and a coin box mechanism including thecoin control magnet 1 and coin actuated contacts 6. Reference may be had to the patent to O. F. Forsberg No.

1,043,219 of November 5, 1912, fora completedisclosure of the coin box mechanism.

The line finder LFI, connectors Cloud .02,

selectors SI, S2, ISI and IS! and coin control connector CCC each comprises a two-motion step-by-step switch, each of which is represented in the drawings by a set of. brushes and one, two or threefsets of terminals. Reference may be had to pages 53 to 65, inclusive, of the second edition f Automatic Telephony by, Smith and Campbellfor a detailed description oi the structure of switchesof this type and their operation when used as selectors and connectors. Refer- No. 1,779,654 of April .7, 1931 for a description or the operation of a switch of this type when used as a line finder. The line circuits ALCI and LC]; coin control connector CCC, coin control trunk circuit CTI, auxiliary trunk circuit ATI,

two-way trunk circuit TWTI and incoming selector ISI are shown in detail; and the auxiliary trunk circuit ATZ, two-way trunk circuit TWTZ and incoming. selector 182 are similar to the trunk. circuits ATI, "I'WTI and selector. ISL, respectively. The trunk circuits 'I W' IT3 and TWT4 coming selector ISZ and two-way trunk circuit once may be had to the patent to R. L. Stokely may be similar to the trunk circuit TC4 disclosed in detail in the patent to R. B. Buchanan et al. No. 2,233,282 of February 25, 1941. The cord circuit and position equipment of the operator's position may be similar to that disclosed in the patent to R. E. King et al. No. 2,209,777 of July 30, 1940.

Calls between stations A and other stations in the same dial ofiice are completed through a line finder LFI, coin control trunk circuit CTI, first selector SI, second selector S2, additional selectors, if any (none being shown), and a connector. Calls to an operator are completed through a line finder LFI, coin control trunk circuit CTI, first selector SI, trunk circuits such as ATI and TWTI and the associated interofiice trunk TI to an operators position in a master ofilce. If a call from station A is completed on a delayed call basis by an operator in the master office, a cord is connected to an idle trunk circuit such as TWT3 and the connection is completed through the trunk TI, an incoming selector ISI, second selector S2 and a connector Cl. To dispose of the coins at a calling station A the operator establishes a coin control connection through an idle trunk TI or T2, the associated incoming selector ISI or 182, coin control connector CCC and auxiliary line circuit ALCI to the line LI. The coin control connector includes an auxiliary rotary selector consisting of a rotary stepping magnet I85, brush I8I and associated bank of terminals, off-normal springs I82, and a release magnet I83. The connector switch comprises brushes I61, I68 and I69 and includes normal post springs I16, which are actuated when the brushes are on the second level of the bank, and normal post springs I'I'I which are actuated when the brushes are on the seventh level of the bank. It is assumed that there are not more than I one hundred lines arranged for coin box service in the dial ofiice, so that each coin control connector has access to all coin lines.

Further description will be facilitated by describing the operation of the various circuits in detail. A, removal of the receiver from the receiver hook closing a circuit through the windings of line relay I6 of line circuit LCI in series with the conductors of line LI. Relay I6 is thereby energized sufiiciently to effect the closure of its outer front contact,'without actuating its other contacts, to connect ground potential to start conductor ST to start an idle line finder LFI in the group of finders having access to the calling line in usual and well-known manner. When the brushes of a line finder LFI engage the terminals to which conductors I3, I4 and I5 of line circuit LCI are connected, the line LI is connected to the coin control trunk circuit CTI and a circuit is closed through the brush and 'terminal. to which conductor I5 is connected, for energizing the middle winding of relay I6 sufiiciently to effect the actuation of all of the contacts of this relay. The complete operation of relay I6 disconnects the windings of relay I5 from conductors I3 and I4 and disconnects groundfrom start conductor ST. Relay 29 of coin trunk CTI is operatively energized in a circuit traced from battery through the inner lower back contact of relay 33, lower back contact of relay 45, outer lower back contact of relay 34, inner lower back contact of relay 26, lower back contacts of relay 24, conductor 22, middle brush of line finder LFI, conduc- Assume that a call is initiated at station I tor I4, a back contact of relay I I, lower conductor of line LI, left winding of coil IE1 at station A,

contact of the receiver-hook switch, transmitter 9, lower contact of dial 8, upper conductor of line LI, a back contact of relay II, conductor I3, upper brush of line finder LF I, conductor 2|, upper back contacts of relay 24, outer lower back contact of relay 26, retard coil 28, winding of relay 29, to ground at the inner lower back contact of relay 34. The operation of relay 29 closes a circuit for operatively energizing the winding of relay 3!. The operation of relay 29 also closes a circuit including the inner upper back contact of relay 34, back contact of relay 39, Winding of relay 35, and the upper back contact of relay 42 for causing the operation of relay 35. The operation of relay 35 connects ground to sleeve conductor 23 to hold the line finder LFI and Opens the short circuit across retard coil 35. The operation of relay 3| closes a circuit, including the uppermost back contact of relay 45, for operating relay 34. The operation of relay 34 closes a holding circuit for relay 35, independent of relay 29 and opens a normally closed short circuit across the lower winding of relay 32, thereby including this winding in series with the winding of relay 29 and the conductors of line LI. The operation of relay 34 further changes the operating circuit of relay 29 to include the upper winding of relay 32, the winding of relay 40, lower back contact of relay 45 and the lower back contact of relay 33. Relay 40 is marginal and does not operate until a coin is deposited at the calling station. The operation of relay 34 also closes a bridge across conductors 51 and 58 to effect the operation of the line relay (not shown) of selector SI. This bridge is traced from conductor 51, through the outer upper back contact of relay 49, winding of relay 4?, conductor 31, retard coil 36, outer upper back contact of relay 55, resistor 54, outer upper front contact of relay 34, conductor 38, winding of relay 48, lower back contact of relay 49, to conductor 58. The operation of the line relay of selector SI effects the connection of a' holding ground potential to the sleeve conductor 59 in usual and wellknown manner, this ground potential being further extended through the inner upper back contact of relay 45, to sleeve conductor 23 to hold the line finder LFI. Relays 41 and 48 are oppositely polarized sothat relay 48 operates in series with the line relay of selector SI but relay 4? does not operate. When the subscriber at station A deposits a coin, the contacts 6 are actuated thereby connecting ground potential through the Winding of coin control magnet I to the conductors of line LI, thereby increasing the current through the winding of relay 40 sufiiciently to effect the operation of this relay. The operation of relay 4U closes a circuit from battery through its front contact, winding of relay 33, back contactof relay 32 and sleeve conductor 59 to holding ground potential, thereby effecting the operation of relay 33. Relay 33 looks, independent of relay 40 under the control of relay 32, and closes circuits for operating relays 45 and 46. The circuit for operating relay 45 includes the inner upper front contact of relay 33 and the upper back contact of relay 26. The operation of relay 33 connects the winding of impulse relay M to the lower conductor of line LI and opens the circuit through the winding of relay 40. The operation of relay 43 closes a circuit for holding relay 45 independent of relay 33 and for maintaining the energization of its own winding under the control of relay 26 but independent of relay 33. The operation of relay 45 causes the release of relays 3I and 34,

opens, the connection between conductors 23and 59, and connects ground directly to conductor 23. The release of relay 3| closesashort circuit across the winding of .relay29, and lower winding of relay 32; so that relay 2'9releases, if not already released due to the deposit of a coin at, the calling station. series with the impulse contact f1the dial ,8 at station A, closing a circuit for operating relay 39. Relay 39 closes a circuit for holding, relay 35 operated under the control of. relay 4|. lower front contact, relay 4|. maintainsthe bridge across conductors 5.7 and 58 after the. release of relay 34. Relays 3| and 34 are. slow in releasing in order to insure that relay 4| is fully operated before relay 34 releases.

It is the purpose of relay 32. to block the operation of the trunk circuit CT| .in case. ground is connected directly to the .line at the calling station without the, deposit of a coin. The operation of relay 32 in such a case prevents the operation of relay 33. If relay 32 operates, it looks in series with relay 40f to the grounded sleeve conductor 59, prevents the operation of relay 33, and causes the release of relay 29 by connecting grounded sleeve conductor 59 to conductor 22, the line loop and winding of relay 29 being thereby short-circuited. The release of relay 29 in such a case causes the release of relays 3 and 34. The

release of relay 34 causes the release of relay 35 and opens the, bridge across conductors 51 and 58. The release of the line relay of the selector SI', when the: bridge across conductors 51 and 58 is opened, causes the disconnection of holding ground potential from conductor 59, thereby effecting the release of relays 32 and 40 and the return of the line finder LFI to normal in usual manner. i

A coin having been deposited at stationA, the

operation of relay 4| and release of relay 34] effects the closure of a dial tone transmitting connection between conductors 2| and 22, through condensers 25, innerfront contacts of relay 35, a front contact of relay 33 and a back contact of relay 34, to conductors 51 and58. The bridge across conductors 51 and 58' for control.

of the line relay of selector Si is now traced from conductor 51 through theouter upper back contact of relay 49, winding of relay 41, conductor 31, retard coil 36,0uter upper back contact of relay 55, resistor 54, lower ,front contact of relay 4|, 'winding of relay 48, lower back contact of relay 49 to conductor 58. When the subscriber at station A dialsth'e firstdigit of the number of a subscribers station with Which a talking connection is desired, relay 4| is alter- Relay 4| operates in- At its called line, and, when, the calling subscriber dials the last two, digits: of the called subscribers number, the dial impulses .efiectthe operation of .the connector C2 .to establish connection with the calIedlineLZ. The. called lineis tested and, if the lineis idle, a source .of. ringing current is connectedto the line. Whenthe call is answered at station E, the current through conductors 51 and, 58 is reversed in the usual manner. to effect the operation of polarizedrelay 41 and effect the releaseof polarized relay 48. The operation of relay, 48 and releaseofrelay 41 closes a circuit from battery through the winding andcontinuity back contact of .relay 55, in parallel with battery through resistor 5|, winding of relay 49, inner lower back contact of relay 5lland outer'upper back. contact of relay 53, thence through the back contact of relay 48; and:front contact of relay 41 ito grounded conductor 59. Each-of relays. 49 and 55 lockstoground at the innerupper front contact of. relay 45. The operation of relay 5 closes a circuit for operating relay 24 thereby to close a connection between conductors 2|and 22 and conductors 51, and 58 for conversation between stations A and B. Relays 39 and release; so as to short-circuit retard coil 3.6, during the repeatingof each train of dial impulses. The operation of relay 49 closes a circuit for operating relay 53, short-circuits the winding 10f relay 41 and interchanges the connectionsbetween conductors 2| and 22 and conductors51 and 58, so that relay 41*re1eases and relay 48 reoperates. With relay 53 operated and relay.4|-released, a circuit is closed from battery through resistor 52, winding of relay 50, inner upper front contact of relay 53 and back contact of relay 41:, for operating relay '50. Relay looks through its innerupper front contact and opens the short circuit across the winding of relay 41. .Theaforementioned operation of relay 24 causes the releaseof relay 4|; and the release ofrelay 4| causes the release of relays as and 35.

When thesubscriber at station A'replacesthe receiver to release the connection, the opening of the loop circuit over line Ll effects the release of g the line relay (not shown) of the conriectorCZ,

nately released and reoperated in response toeach im pulse createdby the impulse contact of dial 8, each release of relay 4| being effective to repeat the impulse to the'line relay of selector Si. The brushes of selector SI are thereby advanced to select the level corresponding to the digit dialed; and the brushes of selector SI are thereupon automatically advanced in the selected level toseize a set of terminals connected to an idle intermediate selector or to a connector if the number of subscribers in the dial office is not large enough to require the use of such selectors. As shown in the drawings the terminals 6|! represent a level in which the terminals are connected to second selectors, the terminals 60 being connected to a selector S2. When the calling subscriber dials the-second digit, the selector S2 is whereby holding ground potential is disconnected from conductor 59, causing the release of relays 24 and 33. The connector C2, selector S2 and selector SI are restored to normal in usual manner; but the line finderLFl isheld operated due to the connection of sleeveiconductor 23 to ground at the inner upper front contact of relay 45. The

upper and lower contacts of interrupter 21 are alternately closed for half-second intervals, and as soonafter relay 33 releases asground is next connected to the lower contact of interrupter 21,

relay42 is operated in a circuit traced from battery-at the upper back contact of relay 33, through the winding and lower continuity back contact of relay 42 andfouter lower front contact of relay 45 to ground atthe lowerbontact of interrupter 21. Relay 42 looks to ground at the front contact of relay-1 5', disconnects battery from the winding of relay 35 and'connects battery to lamp 453 in series with. alarm relay 44. As soon'after the operation of relay 42 astheupper jcontact of interrupter21 is next closed, acircuit is closed from, ground throughthis contactfwinding of relay 26, outer lowerfront contact of relay 42 and inner lower front contact of relay45, to battery at the inner lower back contact of relay 33, thereby operating relayZE. The operation of relay 26 closes'a circuit for operating the coin collectmagnet 1' at the-calling subscribers station, this circuit being traced from coin collect battery CC through the lower front contact of relay 55, winding of relay 30, lower front contacts of relay 26, back contacts of relay 24, conductors 2| and 22, brushes of line finder LFI conductors l3 and I4, back contacts of relay II, to the conductors of line Ll, thence to ground through the winding of coin collect magnet 1 and coin actuated contact 6. The coin collect magnet 1 is thereby operated to efifect the collection of the coin. Relay 39 of coin trunk circuit CTI is operated by the current in this circuit,

thereby closing a holding circuit for relay 46.

When the upper contact of interrupter 21 is next opened, relay 28 releases, disconnecting the coin collect battery CC from conductors 2| and 22. When the upper contact of interrupter 21 is next closed,relay 26 is reoperated again closing the connection between coin collect battery CC and the conductors of the line L|. The coin having been collected by the first application of coin collect battery, the coin actuated contacts 6 are open so that relay 30 of coin trunk CTI does not operate and relay 46 releases. The release of relay 46 causes the release of relay 45 and the release of relay 45 disconnects ground potential from conductor 23 thereby causing the line finder LFI to be restored to normal and effecting the return of the coin trunk CTI to normal.

If the called subscriber replaces the receiver before the calling subscriber, relay 41 reoperates and relay 48 releases due to the reversal of the current through the windings of these relays. The winding of relay 49 is thereby short-circuited and relay 49 releases. The release of relay 49 causes the release of relay 53 and again interchanges the connections between conductors 41 and 48 and conductors 51 and 58, so that relay 41 releases and relay 48 reoperates. The release of relay 41 short-circuits the .Winding and causes the release of relay 50. When the connection is released at the calling station A, the coin is collected as above described.

If the call to station B is not answered, the current through conductor 51 and 58 is not reversed so that relays 49, 50, 53, 55 and 24 are not operated.- In this case, release of the connection causes the coin deposited at station A to be returned, coin return battery CR bein connected to the conductors of line L| under the control of relays 26 and 42 and interrupter 21.

Assume now that the subscriber at station A dials the digit or any other digit which effects the operation of selector S| to route the connection through a trunk circuit to the master oflice. The terminals 6| and 62 represent a level in which the terminals are connected to trunks to the master ofiice. Assuming the terminals 62 to be the selected set of terminals, a circuit is closed for operating line relay 90 of two-way trunk circuit TWTI. This circuit is traced from battery through the lower winding of relay 90, inner lower back contact of relay 9|, lower left winding of repeating coil ROI, 9. lower back contact of relay 9|, conductor 18, inner lower back contact of relay 16, conductor 68 of auxiliary trunk circuit ATI, inner upper back contact of relay 63, terminal and brush of selector SI, conductor 58 of trunk circuit CTI, lowerback contact of relay 49, winding of relay 48, conductor 38, lower front contact of relay 4|, resistor 54, a back contact of relay 55, retard coil 36, conductor 31, winding of relay 41, a back contact of relay 49, conductor 51, brush and terminal of selector S I, outer upper back contact of relay 63 of trunk circuit ATl,

conductor 61, upper back contact of relay 18, conductor 11, outer upper back contact of relay 9|, upper left winding of repeating coil RCI, inner upper back contact of relay 9|, and the upper winding of relay 90, to ground. The operation of relay 99 closes circuit for operating relays 8| and 92. Relay 8| connects ground to conductor 19, thence through the terminal engaged by the sleeve brush of selector SI to hold selector S|, and through selector S| to conductor 59 to hold relay 33 of coin trunk circuit CTI. The operation of relay 92 interchanges the connections between the windings of relay 85 and the conductors of trunk T| thereby to reverse the current through these conductors to operate the line relay of trunk circuit TWT3 in the master ofiice. Relay 85 is marginal and does not operate until th call is answered by an operator in the master ofiice. The operation of relay 92 connects ground, at a back contact of relay 89, to conductor MS to start the operation of the ringing and interrupter machine if not already in operation. The operation of relay 8| closes a connection from ringing source 82, through the inner upper front contact of relay 8| and the lowermost back contact of relay 80, to conductor 18 to transmit a ringing tone to the calling subscriber to indicate that an operator is being signaled.

The class of service relay 12 of auxiliary trunk circuit ATI is operatively energized, upon seizure of terminals 62, by the current in a circuit through the lowest brush of selector SI and conductor 20, front contact of normal post springs |9 of line finder LFI and resistor |8, to ground. The normal post springs I9 are actuated when the brushes of the line finder engage a set of terminals in a level in which coin box lines are terminated. The resistor 8 is low enough in resistance to effect the complete operation of relay 12; and relay 12 in turn connects ground to conductor 14 to cause the complete operation of relay 84 of trunk circuit TWTL Two other classes of service may be provided, conductor 28 being connected through a set of normal post springs at the line finder to partially energize relay 12 on a call from one of these classes and conductor 20 not being connected to ground so that relay 12 remains normal on a call from a line of the other of these two classes. The complete operation of relay 84 connects tone source 98 to condenser 99 and closes a circuit for operating relay 83; the partial actuation of relay 84 closes the circuit for operating relay 83 but leaves the tone source 91 connected to condenser 99; and, if relay 84 remains normal, relay 83 is not operated. Relay 84 having operated completely on the call in question, relay 83 is operated and tone source 98 is connected to condenser 99. Relay 83 connects ground to the motor start conductor MS to maintain the operation of the ringing and interrupter machine while a class of service tone is being transmitted to the answering operator.

When an operator answers the call by inserting the plug of a cord in jack J3, the resistance bridged across the conductors of trunk Tl in the trunk circuit TWT3 is reduced sufllciently to effect the operation of relay 85. The operation of relay 85 closes a circuit for operating relay '88. Relay opens the audible ringing tone connection, disconnects the ground at its upper back contact from the motor start conductor, closes a holding circuit for relay 8|, and opens the operating circuit of relay 83. Relay 83 i slow in releasing; and the class of service tone source 98 is connected through the lower front contact of relay 84, condenser- 99', and front contacts of relays B3-and 80 to conductor 18 and repeating coil RCI until relay 83 releases, thereby effecting the transmission of a short impulseof class of service tone to the answering operator to indicate that the call originated at a prepayment coin sub-- relay ll, upper front contact of relay 12, conductor l5, uppermost front contact of relay 81, to ground at a front contact of relay85. Relay 16 locks through its lower windin andsleeve con ductor 19, to ground ata front contact of relay 8!. The operation of relay 'I-Binterchanges the connections between conductor El and 68 and conductors l1 and 18, so as to reverse the current through conductors and 5a and thereby effect the operation of relay 4'! and the release ofrelay 48 of coin trunk circuit CTI. The operation of relay 41' and release of relay 48 causes the opera tion of relays, 55, 24, 5B and 53 as hereinbefore described, the operation of relay 1M being effective to connect conductors 2| and 22 directly to conductors 31 and Y38 for conversation between station A and the answering operator. As soon after.

relay 16 operate as the interrupterrelay H next releases, a circuit is closed for operating relay 69, from ground at the back contact, of relay H, lowermost front contact of relay 1'6, lower-back contact ofrelay (if, continuity back contact of relay B9, outer upper front'contact of relay 1'6, winding of relay 69, and resistor to battery. Relay 53 does not operate since its winding is shortcircuited at this time. Relay 59 looks to ground at a front contact of relay 16. As soon as interrupter relay 1! next reoperates, the short circuit across the winding of relay 63 is opened and the winding of relay '63 is operatively energized in a circuit traced from battery through resistor 65,

winding of relay 63, lower frontcontact of relay 69. to ground at a front contact of relay 16. The

lowermost front contact of relay Hi a front con-v tact of relay 63 and a back contact of relay 65 in parallel, and through the lowermost front contact of relay 63 to resistor 10, thereby shortcircuit ng the winding of relay 59. Relay 69 re leases thereby disconnecting coin return battery from line LI and closing a circuit for operating relay 66. After relay '69 releases. relay 53 is held operated until interrupter relay H next reoperates, the circuit for hold ngrelay-B3 being traced from battery through resistor 65, winding of relay 63, continuity back contact of relay 69, middle lower'front contact of relay 63, lowermost front contact of relay l6, toground at aback contact of relay ll. After the coin return battery is dis connected, the line Ll is dischargedwhile relay,

631's held operated. "Relay 66 looks to ground at a front contact of relay I6 and opens the operating circuits of relays l6 and '59. When relay H next reoperates, relay B3 releases, first reestablishing thetalking connection between station A and the answering operator and then opening the bridge through resistor -64 across conductors 61 and B8. Since relay 66 i locked operated under the control of relay 16, further operations of interrupter relay H are ineffective.

trol connection with the line Ll is established by the operator by connecting another cord to a jack J4 of another trunk T2 in the groupof trunks interconnecting the dial and master offices. Upon insertion of a plug in jack J'4,the bridge in trunk circuit TWT4 which is normally connected across the conductors of trunk T2 is reduced in resistance sufficiently to cause the operation of the marginal line relay in trunk circuit TWTI in the dial office, which relay corresponds to relay 85 of trunk circuit TWTI. Since trunk circuit 'I'WTZ and selector 152 are identical in arrangement with trunk circuit TWTI and selector ISI the establishment of the coin control connection with line Ll will be described asv if effected through trunk circuit TWTI and selector ISI, thereby makingis unnecessary to show the trunk circuit TWTZ and selector 182 in detail. The operation of relay '85 closes a circuit including back contactstof relays 8| and 92 for operatingrelay SH and connects resistor 86 in parallel with thewinding of relay 8?. The operation of relay 9| disconnects the left windings of repeating coil RCI from conductors 11 and 18,connects the windings of relay 90 directly to conductors J1 and 1B, and closes a circuitfor operating the line relays! of the associated incoming selector ISL The circuit for operating relay 9! is traced from battery through the lower winding of relay 91, inner lower back contact of relay 96, conductor 94, inner lower front contact of relay 85, back contact of relay 88, a front contact of relay 9|, lower left winding of repeating coil RCI, inner lower frontcontact of relay 9|, winding ofrelay 81 and resistor 86 inparalleL'inner upper front contact of relay 9|, upper left winding of repeatingcoil RCI, a front contact of relay 9|, con ductor 93, upper back contact of relay 96, upper windingof relay 91, toground at a back contact of thefeleventh rotary step springs I04. Relay 91 closes a circuit for operating the slow-torelease relay 98; and relay 98 connects a busymarking ground potential to conductor 95, thence through a back contact of relay and a front contact of relay 9| to conductor 19 to mark the trunk circuit TWTI busy in the banks of selec-- tors SI. In case a selector such as SI seizes the trunk circuit TWTI before relay 98 connects the busy ground to conductor 19, relay operatesand the outgoing call to the operator is givenprecedence over the incoming call from, the operator, the operation of relay, 80 as above described being effective to cause the release of relay;9l.

Assuming-that ground is connected to conductorlQ bfore any selector SI tests the busyv condition of trunk circuit TWTI, the operator now dials a particular digit to selectively operate the incoming selector TSI to extend the connection to a coin control connector CCC, dials a coin disposal digit to selectively set the coin con--v trol connector for collecting or for refunding the coin deposited at the calling subscriber's station, and dials the directory-listed number of the calling subscribers station to establish connection with the auxiliary line circuit ALC I associated with the calling subscribers line. To prepare the coin control connector for collection of the coin, the digit 2 is dialed'preceding the directorylisted number; and, to prepare the coin control connector for refunding the coins, the digit 7 is dialed preceding the directory-listed number. When the operator dials the particular digit required for selection of a coin control connector, the line relay 85 alternately releases and reoperates as many times'as there are units in the digit dialed, thereby repeating the dial impulses to relay 91 of selector ISI. The release of relay 85 in response to the first impulse of the train closes a circuit for operating relay 88. With relay 88 operated, the non-inductive resistor 89 is included in the circuit for operating relay 91 in' place of the left windings of repeating coil ROI and the Winding of relay 81, thereby insuring the reoperation of relay 91 between impulses. Relay 88 is slow in releasing and remains operated until all of the impulses in the train have been received by relay 85. The release of relay 91 in response to the first impulse closes a circuit from ground at the middle lower back contact of relay 96, through the back contact of relay 91, lower front contact of relay 9B, winding of relay 99, and winding of vertical stepping magnet I8I to battery. The stepping magnet I8I and relay 99 are both operatively energized, the operation of magnet I8I being effective to step the brushes of selector ISI up to the first level of the bank. When the shaft of selector 'ISI moves out of normal position, the vertical off-normal springs I85 are actuated, closing a circuit for operating relay I88. This circuit is traced from battery through the winding of relay I88, upper front contact of springs I85, front contact of relay 99 to ground at a front contact of relay 98. Relay I88 closes a locking circuit which includes the back contact of rotary stepping magnet I82, lower front contact of relay I88 and the middle lower back contact of relay 96. When relay 91 reoperates at the end of the first impulse, stepping magnet I8I releases. The release and reoperation of relay 91, in response to each succeeding impulse of the train created by the dialing of the digit which effects selection of a coin control connector, causes a corresponding operation and release of stepping magnet I8I, thereby stepping the brushes up to the level corresponding to the digit dialed. Being slow in releasing, relay 98 remains operated, while relay 91 is responding to dial impulses. and remains, operated until all of the impulses in the train have been received by relay 91. When relay 99 releases, it closes a circuit for operating the rotary stepping magnet I 82, thereby advancing the brushes of selector ISI into engagement with the first set of terminals in the selected level. 'The operation of stepping magnet I82 causes the release of relay I88 and the release of relay I88 causes the release of stepping magnet I82. If the first set of terminals is connected to a busy coin control connector, the sleeve brush of switch ISI encounters a busy ground poten- Relay 99 is also slow in releasing tial which effects the reoperation of relay I88. The circuit for reoperating relay I88 includes the upper front contact of springs I85, back contact of rotary stepping magnet I82, lower back contact of the eleventh rotary step springs I84, lowermost back contact of relay 96, through conductor I89 and the sleeve brush of switch ISI to the busy-marking, ground potential. The reoperation of relay I88 causes the reoperation of stepping magnet I82 thereby advancing the brushes to the next set of terminals. The reoperation of stepping magnet I82 causes the release of relay I88 and the release of relay I88 causes the release of stepping magnet I82. Relay I88 and stepping magnet I82 thus cooperate to continue the advance of the brushes, step by step in the selected level, until an idle set of terminals is encountered; whereupon relay 96 is operated in a circuit traced from battery, through the Winding of relay I88, upper front contact of springs I85, back contact of stepping magnet I82, lower back contact of springs I84, winding of relay 96, to ground at the upper contact of relay 98. Assuming the terminal set III t be the selected set of terminals, the operation of relay 95 connects conductors 93 and 94, through front contacts of relay 96, conductors I81 and I88, brushes of selector ISI and conductors H1 and H8 to the windings of line relay I5I of a coin control connector CCC, thereby causing the operation of relay I5I under the control of relay of trunk circuit TWTI. Relay I5I closes a circuit for operating slow-to-release relay I52. Relay I52 connects holding ground potential to conductor II9 to hold relay 96, connects ground to conductor I58, and connects ground to the motor start conductor MS to start the ringing and interrupter machine, if not already'in operation. The aforementioned operation of relay 96 disconnects relay 91 from conductors 93 and 94, thereby causing the successive release of relays 91 and 98. Since relay 98 is slow in releasing, it does not disconnect ground from conductor 95 until after relay I52 of connector CCC has con nected ground to conductor II9 to maintain the operation of relay 99, this ground being further extended through the outer lower front contact of relay 96 to conductor 95, thence to conductor 19 to maintain the busy marking of trunk circuit TWTI in the banks of selectors SI. When ground is connected to conductor I58, the upper winding of relay I6I is operatively energized in preparation for the application of coin collect or coin return battery to the calling line as hereinafter described. Relay I6I'locks through its middle lower front contact and the lower back contact of relay I64 to conductor I58.

The operator now dials the coin disposal digit to selectively prepare the connector CCC for collection or return of the coins deposited at the calling station, the dial impulses thus created being repeated by relay 85 of trunk circuit TWTI to relay I5I. The release of relay I5I in response to the first impulse closes a circuit from ground through its back contact, a front contact of relay I52, back contact of vertical off-normal springs I1I, winding of relay I53, and winding of vertical stepping magnet I15, to battery. Stepping magnet I15' and relay I53 are thereby operatively energized,'the operation of stepping magnet I15 being effective to step the brushes I61, I68 and I69 up to the first level of the bank. The vertical off-normal springs I1I are actuated when the brush shaft moves out of normal position, the circuit for operating stepping magnet v 2,374,964 I15 and'relay I53 being therebymodified to in clude the lower front contact ofsprings' I'll and the inner front contactof relay, I53in placeof from normal into engagement with the first terminal of its bank. The reoperation of relay I I at the end of the first impulse opens thecircuit for energizing relay I53 and stepping, magnet I15. Stepping magnet I releases butrelay I53 is slow in releasing and remains operated until all of the impulses in the train have been received by relay I5I. relay I5I in response to each succeeding impulse of the train causes the operation and'release of stepping magnet I15 thereby advancing the brushes I 61, I68 and I69 to the level corresponding to the digit dialed. If the operator wishes to collect the coins-at the calling station, the dialing of the digit 2 efiects the advance oftthe brushes of the coin control connector to the second level, thereby actuating bothsets of normal post springs I16 and I11. If theoperator wishes to return the coins, the dialing of the digit 1 effects the advance of the brushes to the seventh level, thereby actuating only the normal port 5 olf-ncrmal springs I1I, winding of release magnet I13, lowermostback contact of relay I51, outer lower back contact of relay I56, to ground atthe outer back contact of relay I53. The operation of release magnet ll3 closes a locking circuit for its winding and efi ects the return of thebrushes I61, I68 and I69 tonormal. If

the normal post springs I16 are actuated, the operation of release magnet I13 closes a circuit for operating relay I63, this circuit being traced from the winding of relay I63, through the contact of springs I16, terminal I and brush ,IBI

The release and reoperation of iary rotaryyselector is operated by relaylilto 1 advanceibrush I 8I to terminal 2; anchwhen relay I 53 releases atthe end of this train of im pulses; the release magnet I 13 is again operated I to restore the brushes, thereby absorbing this digit. .When the seconddiglt is dialed the brushes of connector CCC are'advanced to the level cor-I responding to this digit; and the brush I8I of the auxiliary selector is advanced to terminal 3. When relay I53 releases at the end of the train of impulses corresponding to the second digit of thecalling subscriber's number, the re lease magnet I13 is again operated to effect the return or the brushes of connector CCC to normal and to close a circuit, including conductor I9I, terminal 3 and brush I8I of the auxiliary selector, for operating relay I56. Relay I56 locks to conductor I50. When the third digit of the impulses does not effect the operation of release magnet I13 since relayI56 is operated; and the brushes I61, I68and I69 remain on the level 'corresponding to the tens digit of the calling subof the auxiliary rotary selector, and the upper front contact of release magnet I13, to grounded conductor I; inwhich case, relay I63 locks directly to conductor I50 and connects coin collect battery CC to the winding of relay I55. If the normal post springs I16 are not actuttedgrelay I63 is not operated and coin return battery CR remains connected to the winding of relay I. The actuation of normal post springs l11 when the brushes of connector. CCC are on either the second level or on the seventh level prevents the operation of relay I51 in response to the coin dis- I posal digit. When the brush shaft of connector CCC reaches normal, the springs I1I are restored to normal, thereby causing the release of release magnet I13.

The operator now dial the directory-listed numberof the calling station, the trains of impulses thus created being repeated by relay 85 of trunk circuit TWTI to relay I5Iqof connector CCC. When the first of thesedigitsis dialed, the brushes I61, I68 and I69 are advanced by the operation of stepping magnet I15 under the control of relay I5I to, the level corresponding to this digit. The steppingmagnet I80 of auxilscribers number. Whenthe fourth digit of the directory-listed number is dialed, relay I5I controls the. operation of relay I62 and the rotary stepping magnet I14,the windings of relay I62 and stepping magnet I14 being connected in parallel through back contacts of relay I51, thence through a front contact of relay I56, innerback 1-. contact of relay I53, lower front contact of springs Ill, and a front contact of relay I52 to ground atthe back contactflof relay I5I in response to eachimpulse. Relay I62 closes-a circuit for operatingstepping lnagnet I to ad- Vance the brush IBI to terminal 5. Being slow in releasing, relay I62 remains operated during the response of relay I5I to this train or dial im: pulses. The rotary stepping magnet I14 is operated in response to each impulse, thereby rotat ing the brushes I61, I68 and I69 into engagement with the set of terminals to which the auxiliary line circuit ALCI of the calling line is connected. The rotary, off-normal springs I12 are actuated when the brushes are advanced tofthe first set of terminals in the selected level; When allot the impulses in the train have been received, the releaseeof relay I62 closes a circuit for operating relay I 51, this circuit including conductor I92,

terminal 5 and brush I8I ot'the auxiliary selector, contact of springs I12, and back contact of relay I62. Relay I51l0cl s toconductor I50, disconnects the winding of relay I62 from the back contact of relay i I5I and connects this winding, through the outer lowerback contact of relay I54 and upper front contact ofrelay I56 to the (SO-impulse per minute interrupter I66.

net I of the auxiliaryselector'to advance brush I8I one step. party line are connected to a single set of terminals in the banks of connectors and code ringing is used to signal the various stations, the'last digit of the directory-listed number of the call ing station is a ringing code digitwhich the operator dials during the interval while'the brush v IBI is "being advanced 'under'control of interrupter I66'from terminal 5 to terminal 8 I5I responds to this train of impulses when re Relay I62 is thereby operated once per second under the control of interrup-ter I66, each operation of relay I62 causing the operation of steppingmag-I lay I64 looks through the back contact of relay I58 to conductor I 50, and closes a circuit from ground at the front contact of relay II, through the uppermost front contact of relay I64, brush I68 and conductor I98 for operating relay II of the auxiliary line circuit ALCI. The operation of relay II disconnects the conductors of line LI from conductors I3 and I4, connects the conductors of line LI to conductor I91, and connects resistor I2 across conductors l3 and I4 to hold relay 90 of the trunk circuit through which the talking connection between the station A and operator is established. With both of relays I54 and I64 operated, the upper winding of. relay I6I is deenergized, but relay IN is held operated by itslower winding and inner lower front contact of relay I64 'until'the brush of interrupter I66 is next disconnected from ground. When ground is next disconnected from the brush of interrupter I66, relay I 6| releases. The release of relay I6I opens the operating circuit of relay I64, but relay I64 is held operated under control of relay I 58. When ground is again connected to the brush of interrupter I66, relay I58 is operatively energized, thereby connecting either coin collect or coin return battery to the conductors of line LI. If the coins are to be collected, relay I 63 has been operated as above described and coin collect battery CC is connected through the lower front contact of relay I63. winding of relay I55, front contact of relay I58, brush I6! and engaged terminal, conductor I91, front c0ntacts of relay II, both conductors of line LI, coin control magnet I, to ground at the coin actuated contact 6. The coin control magnet I is thereby energized to effect collection of the' coins and relay I55 i operated to close a holding circuit for relay I64. If the coins are to be returned, relay I63 is normal and coin return battery CR is connected to the line LI to energize coin control magnet I to effect return of the coins. 1 Being slow in releasing, relay I64 does not release during'the interval after relay I58 operates and before relay I55 operates. While relay I64 is operated, a coin collect or a coin return tone is transmitted to the operator by connecting either the tone source Tl or the tone source T2, depending on Whether relay I63 is normal or operated, through the middle upper front contact of relay I64, condenser I65, brush I69 and engaged terminal, conductor I99, and a front contact of relay II to conductor I4. When ground is next disconnected from the brush of interrupter I 66, relay I59 releases, disconnecting the coin collect or coin return battery from the line LI. After relay I58 releases, the conductors of line LI are discharged through resistor I59 and condenser I60. When relay I 55 releases due to the opening of the coin actuated contacts 6, relay I64 releases thereby causing the release of relay II to reestablish the talking connection between the calling station and the operator or other called station. After disposing of the'deposited coins, the operator releases the coin control connection by removingthe plug from jack J4 thereby releasing relay 65 of the trunk circuit TWTZ. The release of relay 85 opens the bridge across conductors 93 and 94, releasing relay I5I. The release of relay I 5I releases relay I52, thereby disconnecting ground from conductors I I9 and I56. The release of relay I52 closes a circuit for operating release magnet I83 to restore the auxiliary rotary selector to normal. The disconnection of ground from conductor H9 causes the release of selector ISZ in usual manner and the release of relay 9| of trunk circuit TWTZ. The disconnection of ground from conductor I56 causes the release of relays I54, I56, I57 and I63, if operated. The release of relays I51 and I56 closes the circuit for operatively energizing release magnet I13 to effect the return of the brushes I61, I68'and I69 to normal.

The talking connection from the calling station, through the line finder LFI, coin trunk CTI, selector SI and trunk TI is maintained until both the calling subscriber and operator release the connection. When the calling subscriber replaces the receiver to normal, relay 96 of trunk circuit TWTI releases, thereby causing the release of relay 92, whereby the current over trunk TI is reversed to give the operator a disconnect signal. When the operator removes the plug from jack J3, the resistance of the bridge across the conductors of trunk TI is increased to effect the release of relay B5. The release of relay 85 causes the release of relay and with both of

relays

80 and 96 released, relay BI releases, thereby completing the restoration of trunk circuit TWTI to normal. The release of relay 8| also disconnects ground from conductor I9 thereby effecting the release of relay I6 of trunk circuit ATI, the release of selector SI and the release of relay 33 of coin trunk CTI. The release of relay I6 causes the release of 66 thus completing the restoration of trunk circuit ATI to normal. The release of relay 63 causes the operation of the coin trunk CTI to connect coin collect battery to the line LI as above described. Since the coins have already been collected, relay 30 does not operate to hold relays 46 and 45; and the coin trunk CT is restored to normal as above described. When relay 45 releases, it disconnects ground from conductor 23 causing the line finder LFI to be restored to normal and releasing relay I6 of line circuit LCI.

If an operator wishes to complete a delayed toll call from station A through trunk TI, a cord is connected to a jack J3 and the directory-listed number is dialed. The selector ISI operates responsive to the train of impulses created by the dialing of the first digit to select an intermediate selector such as S2; and the dialing of the remaining digits effects the operation of the selector S2 and a connector CI to complete a connection with line LI. The operator informs the subscriber that the toll call may now be completed and requests the deposit of coins. A coin control connection is then established over another trunk T2 as above described to dispose of the deposited coins. When disposal of the coins is completed, the coin control connection is released and the talking connection maintained until the plug of the cord is disconnected from jack J3, whereupon the trunk circuit TWTI, selectors ISI and S2 and connector CI are restored to normal in usual manner.

If there is a set of terminals in the banks of the connector switches in the dial office for each station on a party line, the directory-listed number does not include a ringing code digit, in

call completed by an operator at said position, a coin control connector in said dial ofiice having a set of terminals individual to said one coin line, means including an impulse dial at said position for extending a connection over another of said trunks to said coin control connector, a coin collect battery and a coin return battery in said dial ofiice, means in said connector responsive to the dialing of one of two particular digits by the operator for selecting the coin collect battery and responsive to the dialing of the other of said particular digits by said operator for selecting the coin return battery, means in said connector efiective in response to impulses created by operation of the dial by the operator for selecting said set of terminals, and means including means individual to said one coin line operative upon selection of said set of terminals by said coin control connector for connecting the selected coin battery to said one line to effect the desired operation of the coin control magnet at the associated coin subscribers station.

7. In a telephone system, a dial oflice comprising subscribers lines and stations, each of some 'of said stations including coin receiving means and a coin control magnet for selectively effecting the collection or return of deposited coins, a

toll operators position, trunks between said dial oiiice and operators position, means including one of said trunks connecting one of said coin subscribers lines to said position for conversation on a call completed by an Operator at said position, a coin control connector in said dial office having a set of terminals individual to said one coin line, means including an impulse dial at said position for extending a connection over another of said trunks to said coin control connector, a coin collect battery and a coin, return battery in said dial ofiice, means in said connector responsive to the dialing of one of two particular digits by the operator for selecting the coin collect battery and responsive to the dialing of the other of said particular digits by said operator for selecting the coin return battery, means in said connector effective in response to impulses created by operation of the dial by the operator for selecting said set ,of terminals, and means including means individual to said one coin line operative upon selection of said set of terminals by said coin control connector for opening the conversational connection between said one coin line and said one trunk, for connecting the selected one of said coin batteries to said line to effect a desired operation of the coin control magnet at the associated coin subscribers station and for holding the connection between said one coin line and said one trunk while said coin control magnet is being operated.

8. In a telephone system, a dial oflice comprising subscribers lines and stations, each of some of said stations including coin receiving means and a coin control magnet for selectively eifecting the collection or return of deposited coins, a toll operators position, trunks between said dial office and operators position, means including one of said trunks connecting one of said coin subscribers lines to said position for conversation on a call completed by an operatoor at said position. a coin control connector in said dial ofiice'having a set of terminals individual to said one coin line, means including an impulse dial at said position for extending a connection over another of said trunks to said coin control connector, a coin collect battery and a coin return battery in said dial ofiice, means in said connector responsive to the dialing of one of two particular digits by the operator for selecting the coin collect battery and responsive to the dialing of the other of said particular digits by said operator for selecting the coin return battery, means in said connector efiective in response to impulses created by operation of the dial by the operator for selecting said set of terminals, and means including means individual to said'one coin line operative upon selection of said set of terminals by said coin control connector for opening the conversational connection between said one coin line and said one trunk, for connecting the selected one of said coin batteries to said line to effect a desired operation of the coin control magnet at the associated coin subscribers station, for holding the connection between said one coin line and said one trunk and for transmitting a distinctive tone to said operators position while said coin control magnet is being operated.

9. In a telephone system, a dial ofiice comprising subscribers lines and stations including a station having coin receiving means and a coin control magnet for collecting or refunding coins deposited in said coin receiving means, an operators position, trunks interconnecting said ofilce and said position, means including impulse controlled switches and one of said trunks connecting the line of said coin station to said position on a call initiated at said station and completed by an operator at said position, means associated with said one trunk responsive to answer of the call by the operator for effecting the return of any coins then in said coin receiving means, a coin control connector, a set of terminals in the bank of said connector individual to the line of said coin station, means including another of said trunks for connecting said position to said coin control connector, an impulse dial at. said position, a coin collect battery and a coin return battery in said dial ofiice, means in said connector responsive to the dialing of one of two particular digits for selecting the coin collect battery and responsive to the dialing of the other of said two digits for selecting the coin return battery, means responsive to impulses created by the operation of said dial by said operator for operating said connec-. tor to seize said set of terminals, and means efiective upon seizure of said set of terminals to connect the selected one of said coin batteries to the line of said coin station to effect a desired operation of the coin control magnet at said station.

10. In a telephone system, a dial oflice comprising subscribers lines and stations, each of some of said stations including coin receiving means and a coin control magnet for selectively effecting the collection or return of deposited coins, a toll operators position, trunks between said dial oflice and operators position, means including one of said trunks connecting the line of one of said coin subscribers stations to said position for conversation on a call completed by an operator at said position, a coin control connector in said dial ofiice having a set of terminals individual to each of said coin lines, means including an impulse dial at said position for extending a connection over another of said trunks to said coin control connector, a coin collect battery and a coin return battery in said dial ofiice, means in said connector responsive to the dialing of one of two particular digits by the operator for selecting the coin collect battery and responsive to the. dialing of the other of said particular digits ber of said one coin subscribers station for selecting the set of terminals individual to the line of said station and for connecting the selected coin battery to said line to effect the desired op eration of the coin control magnet at said on of the coin subscribers stations.

11. In a telephone system, a dial office comprising subscribers lines and stations, each of some of said stations including coin receiving means and a coin control magnet for selectively effecting the collection or return of deposited coins, a toll operators position including an impulse dial, trunks between said dial oflice and operators position, means including one of said trunks connecting the line of one of said coin subscribers stations to said position for conversation on a call completed by an operator at said position, a coin control connector in said dial ofiice having a set of terminals individual to each of said coin I lines, means at said position for extending a connection over another of said trunks to said coin control connector, a coin collect battery and a coin return battery in said dial oflice, means in said connector responsive to the dialing of one of two particular digits by the operator for selecting the coin collect battery and responsive to the dialing of the other of said particular digits by said operator forselecting the coin return battery, means in said connector effective in response to the dialing of the directory-listed number of the coin station on said one of the coin lines for electing the set of terminals which is individual to the line of said one subscribers stations, and means including means individual to said one coin line operative a predetermined interval of time after selection of saidset of terminals by said coin control connector for connecting the selected coin battery to said one line to effect the desired operation of the coin control magnet at the associated coin subscribers stag tion.

12. In a. telephone system, a dial ofiice comprising subscribers lines and stations, each of some of said stations including coin receiving means and a coin control magnet for selectively effecting the collection or return-of deposited coins, a toll operators position, trunks between said dial oflice and operators position,means including one of said trunks connecting the line of one of said coin subscribers stations to said position for conversation on a call completed by an operator at said position, a coin control connector in said dial oflice having a set of terminals individual to each of said coin lines, means in: cluding an impulsedial at said position for extending a connection over another-of said trunks to said coin control connector, a coin collect battery and a coin return battery in said dial ofiice, means in said connector responsive to the dialing of one of two particular digits by the operator for selecting the coin collect battery and responsive to the dialing of the other of said particular digits by said operator for selecting the coin return battery, means in said connector responsive to the impulses created by the dialingof the directory-listed number of the subscribers station on said one coin line for absorbing by an advance of the brushes and return to normal any digits v automatically advancing said auxiliary switch to measure ofi an interval of time during, which the impulses created, by the dialing of a ringing code digit of said number are received in said connector, and means rendered efiective at the end of said interval for connecting the selected coin battery to said one line to operate the coin control magnet at the associated coin subscriber's station.

13. Ina telephone system, an office comprising dial impulse controlled switches for establishing conversational connections, subscribers lines and stations, each of certain of said stations including means for receiving coins'and coin disposal means for collecting and refunding deposited coins, an operators position comprising a dial switches in said dial ofiice, a trunk from said dial ofiice to saidposition, a special connector in said dial oilice for use in efiecting the disposal of coins deposited at any one of said certain stations, a

set of terminals in the bank of said connector individual to each of said certain stations, means including said trunk for connecting said position to said connector, means in said connector responsive to selective current impulses created by the operation of said dial for operating said connector to connect with the'line of any desired one of said certain stations, and means in said connectorselectively responsive to current iml pulses created by the operation of said dial for efiecting the actuation of the coin disposal means at said one station to collect or return depositedcoins, as desired.

JOHN G. WALSH.