US2313852A - Telephone system employing phonographs - Google Patents

Description

"Marh16,1943. H- R. vm Isa/E R 2'313'852 TELEPHONE SYSTEM EMPIJOYI'NG PHONOGRAPHS Filed Sept. 26, I941 3 SheetsSheet l a "R a UPKS C 0RD March16, 1943. H. R. VAN DEV ENTER 2,313,352

TELEPHONE SYSTEM EMPLOYING PHONOGRAPHS Filed Sept. 26, 194] 3 Sheets- Sheet 21 ATTORN EYS illustration,

Patented Mar. 16, 1943 PHONO GRAPH S Harry R. Van Deventer, New York, N. Y., assignor to Peatrophone Corporation, New York, N. I,

a corporation of Nevada Application September 26, 1941, Serial No. 412,410

24 Claims.

This invention relates to telephone systems in which phonographs may be associated with the subscribers lines to deliver and: record messages.

An object of the invention is to provide circults and apparatus bywhich any subscribers line can be connected to a phonograph located at the telephone central ofllce or exchange, With-r out disturbing the existing line or cord circuits and without substantially changing the operative procedure now' in common use.

Another object is to provide means for connecting a phonograph .to any of the subscribers; lines terminating in an exchange, in

.Jsuch a manner that the phonograph is under the control of the operator making the connection between the calling and calledjlines, the latter being connected to the phonograph.

A further object is to provide ai system oi the class described in which a plurality of phono graph circuits may be connected to plugs adapted to be placed in the subscribers line jacks of the switchboard; or connected via the-usual test or terminal plugs as used in the main and intermediate connecting frames in an exchange. In

either event the phonograph circuits can be plugged into any subscribers line without inter-7 fering with the soldered connections on "the terminal racks and other equipment. I

Other objects will be apparent from a perusal of the following specification where, by way oi.

telephone exchange circuits are shown of a type in common use. It will be un derstood, however, that once the inventive concept herein disclosed is understood, that these circuits and the arrangement of the apparatus can be varied within wide limits without departing from the invention as defined by the appended claims. I I J And while preferred embodiments of the inventive idea areshown by way of illustration, it

will be further understood that once the result attained by the circuits and arrangement of apparatus particular to the phonograph circuit and its associated devices as distinguished from the telephone exchange circuits per se) herein disclosed is understood, that many modifications and changes will be obviousto those skilled in theart and that these also may ibemade without departing from the scope of the appended claims.

Referring now to the drawings- Figu e l is a schematic diagram of a subscrib ers line circuit at a telephone exchange together with a schematic diagram of, an operators cord circuit that may be used for connecting subscribers lines, and atthe right of this figure is shown a: phonograph circuit that may be connected to the subscribers line via a plug in one of the line Jacks, of the line or via connections at the main or'intermediate frames; Figure 21s a schematic diagram of an alternate form of phonograph circuit that may be connected to the telephone line either at the main frame or via a plug in one of the line jacks;

Figure 3 is a schematic diagram t an alternate form of phonographlcircuit that may be connected to the telephone line either at the intermediate frame or via a plug in one of. the line jacks; and V Figure 4 is a schematic diagram of an alternate form of phonograph circuit which may be connected to the subscribers line via the intermediate frame. I I

In Figure 1, the numeral I0 denotes the main connecting frame in the exchange on which terminate the incoming line wires I I, I I, of a telephone line connected by the usual jumper wires ill to the multiple jacks I2,-intermediate frame 42, jack I2, line relay I3 and cut-off relay I4, constituting the usual line terminal equipment. This complete line, circuit will hereafter be termed the sub-set circuit.

Should itbe desiredto connect a phonograph to, the sub-set circuit, conductors I5, I6, are connected to a plug or pair of clips indicated at I! adapted to make contact with the connecting springs or terminals of the line wires 1 I, II, in the main frame I0, or to the tip and ring springs of a jack so that the circuit for the phonograph can be bridged on the sub-set circuit as shown without disconnecting or changing anyrof the connections or apparatus in said circuit. The circuit I5, I6, will hereafter be termed the phonograph circuit. I

The phonograph circuit includes a repeating coil having windings I8, I9, 20, -2I, a relay 22, signal current condenser '23, by-pass condenser 24, and the phonograph motor 25 and its cam switch 26 connected as shown, the contacts 28 and 29, iii! and 3 I, of relay 22 being normally open. Should the subscriber on the sub-set circuit remove his receiver from thehook, the apparatus in the sub-set circuit will operate as usual and the line lamp 2'! will be illuminated. The answering operator answers the call by pluggin into the answering jack using the operator's cord circuit marked Oprs Cord and in all respects incomin calls are handled over the sub-set circuit in the Usual manner. none of the apparatus in the phonograph and could record a message.

'will record any message 7 'cares to leave, the talking circuits of the phonoopaque to ringing currents.

, next actuation of the relay 1 denser 23 is short-circuited, nor

Assuming the line rethere'would normally flow in phonograph circuit l5, l3, operating during an incoming call over the sub-set circuit.

However, should some other subscriber call for the subscriber connected to the sub-set circuit, the

. calling operator would plug into one of the multiple jacks l2 and ring on the line in the usual 1 manner. If the subscriber answers the telephone,

the two-way conversation would b .recorded. If a the subscriber does not answer, then the calling subscriber would receive any message left on the either event the operation of the phonograph is as follows:

circuit, I 5, [8,

When the operator, rings on the sub-set ringing current will flow in the circuit ll,

23, winding of relay 22, l9, Hi to I I, thereby oper ating relay 22 which closes its contacts 28, 29,

, thereby short-circuiting condenser 23'and establishing a path f or direct current through the operators cord circuit from the battery 32, through relay 22 which accordingly holds itself locked closed. The closing of this circuitalso operates supervisory relay 48 and extinguishes the operators supervisory lamp 48 in the usual manner, so

' the operator knows that the call is completed.

If automatic ringing is used, the holding relay in the cord circuit acts as usual to disconnect the ringing current. V V v d Relay 22 also closes contacts 30, 3|, which close thecircuitirom the battery 32, or any other suit able current supply for the motor, (such as a source'of A. C. current), through the phonograph motor 25 and its cam switch 26. The phonograph thereupon delivers any message left thereomand graph being connected to the windings 20, 2|, 'of the repeating coil. r

The by-pass condenser 24 affords a path for voice currents across the winding of relay 22, and this condenser may be ofless capacity than the signal current condenser 23 so as to be relatively It does not affect the, operation of the ringing current on the winding of relay 22.

As beforestated, relay 22 is held closed (once it has been operated by ringing current) by reason of the cord circuit battery current from 32. Therefore, when the calling subscriber has 'finished-speaking and hangs up his receiver, thereby lighting the'answering supervisory lamp in the the calling subscriber the operator disconnects both be available to operaterelay 22. Also at this time.

the line relay|3 is out of circuit, as the cut-oil rela M has operated.

As the phonograph motor 25 is controlled by the relay 22, it is controlled bythe withdrawal of the calling operators plug from the sub-set circuit ,7

jack. It is also controlled by the cam switch 26 which is in geared relation to the motor 25 to stop the motor by opening the circuit when the end of a rec-0rd is reached, or at any other time or in any other sequence relative to the length of elapsed time of the incomin callbeing recorded.

From the foregoing it will be seen that the normal operation of a subscribers line is not interiered with in any way by having the phonograph connected thereto; nor is the operative procedure changed in any way. Upon receipt of a call for such a line, the operator merely plugs in and rings in the usual way as it normally calling the subscriber. Instead of the called subscriberanswering, the relay 22operates, extinguishes the calling supervisory lamp and the phonograph speaks to the calling subscriber and he may record a message. When the calling subscriber hangs up his receiver and the operator removes both plugs, re-' lay 22 operates to stop the recording and restore the phonograph circuit to position ready to receive another call. I

' In Figure 2, an alternate form of phonograph circuit is shown, the relay 33 having a winding 34 in series with'condenser 23 and the windings l8, IQ, of the repeating coil across conductors l5, l6. Upon ringing current traversing this circuit, relay 33 closes its contacts whereupon a holding circuit is'completed from the current' source 32 through winding 35, contacts-36, 31, contacts on cam switch 26 to the currentsource at 38, and the relay locks itself in closed position. At the same time contacts 39, 40, close and short circuit the condenser 23 and winding 34 of relay 33, thus forming'a path for direct current across is inserted in the circuit making it opaque to direct current, and the circuit stands ready for the 22 by ringing current.

It will be understood that the resistance and other characteristics of relay 22 are such that when its winding is across the sub-set circuit, it will not operate the line relay I3 even when con-- will it remain in closed contact position. lay l3 to have a total resistance of 2000 ohms, the sub-set and phonograph, circuits about .012 ampere when no operatorsplugs are connected thereto, and relay 22 is of such characteristics that it will not remain closed on such current, nor will it permit sufficient current to flow through it to close the line relay more will conductors |5, |6, via the windings l8, IQ, of the repeating coil. This eirtingulshes the supervisory light in the calling operators cord circuit.

With this circuit, Figure 2, the cam switch 26 is arranged to open its contacts momentarily after a predetermined time-say after 30 seconds of recording which is ample for average service This breaks the circuit through the holding winding 35 of relay 33, which thereupon opens all its contacts stopping the motor 25 and restoring the phonograph circuit to'condition ready to receive the next call.

In Figure 3, an alternate form of phonograph circuit is shown, and the circuit requires that connection be made with the tip, ring and sleeve conductor of the sub-set circuit, accordingly the conductors l5, I6, 4|, of the phonograph circuit are connected to a suitable plug which may be connected to the proper terminals at the intermediate frame 42. or to an ordinary plug to fit the line jacks l2. Plug I1 like any of the plugs shown connected to the phonograph circuit, Figures 1 to 3 inclusive, may be made .to snap on the main or intermediate frame Q terminals. Incoming calls on the sub-set circuit are handled in the usual manner,-but should a calling operator plug into this circuit and ring, the current would traverse conductor |5, condenser 23, winding 43 and conductor H5, and relay 44 would close contacts 45, 46, thus establishing a holding circuit from the cord circuit battery 32 of the calling operator's cord circuit via supervisory lamp 48, sleeve conductor 49, throughthe sleeve conductor of the line jacks lto conductor 41 'of thephonograph circuit, contact 45, 45, locking winding 50; contacts of cam switch26 to at 38, thereby locking the relay 44.

Contacts 51, 52, on relay 44 being now closed, there is a path for directcurrent across conductors l5 16, which extinguishes the super r visor-y lamp 48 in the usual manner, as the supervisory relay 48 operates.

Contacts 53, 54, on relay 44 alsocompletethe circuit through motor 25 and current supply'32,

and as the motor operates the phonograph reproduces or recordsvia windings 20, 24. r

Upon withdrawal of the calling operators plug from the line jack, the circuit from cord circuit battery supply 32 is broken at the sleeve 49 and winding 50 of relay 40 is deenergized, the relay opening all its contacts, thus restoring the phonographlcircuit to condition ready to receive another call.

If at any time cam switch 26 should operate,

relay 44 would release and contacts 5|, 52. open, thereby lighting the supervisory lamp 48 and notifying the operator. i

Figure 4 shows an alternate form of phonograph circuitwhich is adapted to be plugged 'in the sub-set line circuit at the intermediate frame using a six conductor plug indicated diagram matically at 55; and having conductors and ter minals'THR, 56 51 SL and I4, so as to connect the phonograph circuit and apparatus between the line and cut-off relay and the line and jacks of the sub-set line circuit. This results in a transfer circuit by which the functions of the regular line ([3) and cut-off relay (l4) are transferred to other relays H3, 14) associated' with the phonograph and transfer circuits.

, Assuming the line circuit II. II, to be normal, and the phonograph circuit plugged therein as shown, the regular line relay l3 and cutoff relay H are disconnected from the line, and line relay I3 and cut on relay M of the phonograph cirrelay l4 which opens its contacts 58, 59. controlling the circuits through the line relay I 3 thereby releasing the latter, thus opening contacts 5B,

57, and releasin relay [3. thereby extinguishing the line lamp 21.

Contacts 58, 59, now establish a new bridge circuit 63 across I l. I l which can be traced from ,1 the tip side of line,';via 5a to the winding so of signal relay 6|, via condenser 62 and via contact 59 to I l the ring side of the line. However,

, because of the condenser 62 this circuit isiopaque vto direct current fiowingfrom battery 32 in the cord circuit and consequently the operators supervisory lamp 48 is not operated by this circuit but only by the'current flowing out over the circuit II. I I, and through the sub-set connected r thereto. Upon ascertaining the desired number,

the operator rings the party wanted in the usual way and has the usual double supervision not withstanding UlL' fact that the phonograph cirunit as shown is connected to the calling line, as this circuit does not become :operative to start ground 7 incoming calls thereon, or to connect other lines the phonograph 32 unless ringing current is applied to relay 6!;

Assuming now that the sub-setcircuit II, H is; the called line, the operator proceeds as just described up to the point where the circuit through relay 6| has been completed and then rings on the line ringing current passing through winding Gil and condenser 62, will cause relay Bl to close its contacts 64, 55, thereby completing a holding circuit from thebattery 32 via contacts 66, 61 (which are on cut off relay i4? and closed because that relay is energized by a plug being up on the line) via winding '58 on relay 6i to ground at 38. This looks relay 5i which also closes contacts 69, in, completing a circuitfrom line H via contact 58 to winding 18 of the repeat ing coil, via contact" 59 to line l I. As this affords a path for the cord circuit battery 32, the supervisory lamp 48 is extinguished;

Motor 32 gets power via contact 66 on relay M, the circuit being completed at contact 65, relay 6 l. The motor, therefore, cannot start until relay 6! has operated, and will stop when the operator withdraws the plug, thereby releasing relay H.

The cam, switch 26 operates in any desired manner, either to limit the length of each recordingor to open the motor circuit permanently when a given recording space is used on the phonograph record. 4

, It will be observed that the operators in testing a line to which" any of the circuits hereindisclosed are connected will receive the usual busy signal ifsaid line is in useeither by the subscriber or by reason of the phonograph connected thereto being in operation; also, thatstandard operative procedure is used throughout-it not being necessary for any operator to even know a line is phonograph equipped in order to alliswer thereto, and that no special cord or line equipment is necessary at all operators positions, all the special phonograph circuit equipment being local to the plugs for use on the main or intermediate frame, or in line jacks, a sufiicient number of such circuits being provided for each ex change. These circuits can be plugged onto lines as desired and removed, moved and replaced without interfering with the routine work of the operators and without access to the regular operating equipment other than the terminal racks and line jacks.

As the phonograph equipment per se forms no part of the present invention, it is not described in detail as it is obviousthat any suitable mechanism may. be employed and the recording and reproducing circuits by appropriately controlled mechanism connected to the windings 20, 2!, of v the repeating coil so as who inductively coupled to the sub-set circuit, A suitable mechanism is 333,268. filed shown in co-pending application Serial Number May 4, 1940, entitled Telephone answering and recording apparatus. which also shows the construction and operationofthecarn r .swittzh 26 herein referred to.

Obviously the talking circuits of the phono-, graph could be connecteddirectly across the. phonograph circuit l5, IS, without employing the,

repeating coil; or the talking circuits could be connected througlrcondensers or in-any other suitable manner. The coil is preferable however,

The feature of connecting the talking and control circuits of the phonograph to the telephone lines via the connections at the main or inter.

equipment commonly used for testing and bridging connections in exchanges, and therefore no special equipment is necessary except that local to the phonograph circuits connected to the plugs. T

The phonograph may be placed in a room or department of the exchange set apart'for that purpose and wired to numbered plugs conveniently located near the frames. Upon an operator receiving a request fOr phonograph service, this operator merely refers the call to the recording operator, who orders the attendant to plug up the line at the frame. When this is done, the regular operation of the switchboard continues as before.

Should any messages be recorded, upon request from the subscriber, the recording operator can have them played back while the subscriber listens. records, they can be mailed him.

Should the phonograph circuits Figures 1 to 3, inclusive, be connected to the telephone lines "via connecting plugs fitting the line jacks of these lines, the operation of the circuits wouldv be the same as just described. These connecting plugs are conveniently grouped within reach of one or more operators, who, at the request of the subscribers or other operators, plug these plugs into the designated lines. This, it will be observed, does not affect the routine operation of the other operators in the exchange when handling incoming and outgoing calls to the lines so plu ged up.

What is claimed is:

1. In combination with a telephone line circuit having line terminal equipment and including operators cord circuits for connecting said line circuit to other line circuits, means connected to said line circuit opaque to direct current and responsive to ringing current for establlshing a direct current path across'said line circuit, and a phonograph including a circuit which is completed by the establishment of said direct current path, whereby the operation of said phonograph is controlled by ringing current in said first path.

2. In combination with a line circuit having exchange signalling equipment and a jack connected thereto, a phonograph circuit having means normally opaque to direct current and responsive to alternating current including a relay and contacts operated thereby for establish-' cuit having line terminal equipment located at a central office provided with operator's cord circuits for connecting the line circuit to other line circuits, a relay circuit bridged across said line circuit and having a relay and a condenser in series with the winding thereof to render If he wants the phonograph said relay circuit normally opaque to direct current, contacts controlled by said relay and adapted when same is energized to short-circuit said condenser, thereby placing the aforesaid winding directly across said line circuit so that direct current may flow therethrough, a cord circuit connected to said line circuit and adapted to supply direct current to said rela winding to hold said relay closed while said cord circuit is connected thereto, and a phonograph and means for operating the same, controlled by contacts on said relay.

4. In combination with a telephone line circuit having line terminal equipment located at a central office provided with op'erators cord circuits for connecting the line circuit to other line circuits, a relay circuit bridged across said line circuit and having a relay and a condenser in series with the winding thereof to render said relay circuit normally opaque to direct current, contacts controlled by said relay and adapted when same is energized to short-circuit said condenser, thereby placing the aforesaid winding directly across said line circuit so that direct current may flow therethrough, a cord circuit connected to said line circuit and adapted to supply direct current to said relay winding to hold said relay closed While said cord circuit is connected thereto, a phonograph and means for operating the same, controlled by contacts on said relay, and a bypass condenser connected across the winding of said relay.

5. In combination with a telephone line circuit having line terminal equipment located at a central office provided with operators cord circuits for connecting the line circuit to other line circuits, a relay circuit bridged across said line circuit and having a relay and a condenser in series with the winding thereof to render said relay circuit normally opaque to direct current, contacts controlled by said relay and adapted whensame is energized to short-circuit said condenser, thereby placing the aforesaid gra h.

7 6. In combination with a telephone line circuit having line terminal equipment located at a central ofiice provided with operators cord circuits for connecting the line circuit to other line circuits, a relay circuit bridged across said line circuit and having a relay and a condenser in series with the winding thereof to render said relay circuit normally opaque to direct current, contacts controlled by said relay and adapted when same is energized to short-circuit said condenser, a relay winding, a holding circuit including another winding on said relay, contacts operated thereby and a source of current. and a phonograph controlled by the operation of said relay.

'7. In combination with a telephone line circuit having line terminal equipment located at a central olilce provided with operators cord Cir-J:

cults for connecting the line circuit to other line circuits, a relay circuit bridged across said line circuit and having a relay and a condenser 1n series with the winding thereof to render said relay circuitnormally opaque to direct current,

contacts controlled by said relay and adapted when same is energized to short-circuit said condenser, a relay winding, a holding circuit in cluding another winding on said relay, contacts operated thereby and a source of current, a phonograph controlled by the operation of said relay, and a repeating coil winding serially included in circuit with said first, relay winding,

said coil having a second winding connected to i the talking circuits of saidphonograph.

8. In combination with a telephone line circuit having line terminal equipment located at a central oifice provided with operator's cord circuits for connecting the linecircuit to other line circuits, a relay circuit bridged across said line circuit and having a relay and a condenser in series with the winding thereof, a holding including contacts on said second cut-oil relay,

circuit including another winding on said relay and contacts and a source of'current, and a phonograph controlled by the operation of said relay. i

9. In combination with a telephone line circuityhaving line terminal equipment located at a central officeprovided with operators cord circuits for connecting the line circuit to other line circuits, a relay circuit bridged across said ,line circuit and having a relay and a condenser in series with the winding thereof, a holding circuit including another winding on said relay and contacts and a source of current, a phonograph controlled by the operationof said relay, and a repeating coil circuit including the winding of a repeating coil bridged across said phonograph circuit and controlled by the operation of said relay, said repeating coil having a second wind ing connected to the talking circuits of said phonograph.

10. In combination with a telephone line having line and cut-off relays connected thereto, a

transfer circuit having a second line relay and a second cut-oif relay therein connected to said line circuit, said second line relay having contacts connected to said first linerelaytooperate the latter to energize the line lampassociated therewith. a cord circuit adapted to be connected to said telephone line circuit and when so connected to cause both said cut-oft relays to operate and disconnect both said line relays from said telephone line, a circuit controlled by said second cut-01f relay and containing signal responsive means, and a phonograph controlled by said means.

11. In combination with a telephone line havj circuit and in series ingline and cut-off relays connected thereto, a

transfer circuit having a second line relay and a second cut-ofi relay therein connected to said: line circuit, said second line relay having contacts connected to said first line relay to operate the latter to energize the line lamp associated therewith, a cord circuit adapted to be connected to said telephone line circuit and when so connected to cause both said cut-off relaysto operate anddisconnect both said line relays from said telephone line, means operated by said second cut-off relay for connecting a bridge circuit to said telephone line, a signal relay having a winding and a condenser in series therewith in said bridge circuit, a holding circuit serially including contacts on said second cut-oil relay, a source of current, a second winding on phonograph controlled by said signal relay.

12. In combination with a telephone line having line and cut-ofi relays connected thereto, a transfer circuit having a second line relay and a second cut-off relay therein connected to said line circuit, said :second line relay having contacts connected to said first line relay to operate the latter to energize the line lamp associated therewith, a cord circuit adapted to be connected to said telephone line circuitfand when so connected to cause both said cut-off relays to operate and disconnect both said line relays from said telephone line, means operated by said second cut-off relay for connecting a bridge circuit to said telephone line, a signal relay having a winding and a condenser in series therewith in said bridge circuit, a holding circuit, serially a source of current, a second winding onsaid signal relay and contacts thereon, a phonograph controlled by said signal relay, and a repeating coil having a winding connectedto said bridge with contacts controlled by said signal relay, said repeating coil having a second winding connected to the talking circuits of the phonograph. 7 p

13. In a telephone exchange system having a frame in which telephone line circuits are con nected to switchboard apparatus, means for connecting phonograph control and talkingcircuits to said telephoneline circuits in said frame including a detachable graph circuit can be connected to any one of said telephone line circuits while same remain connected to said switchboard apparatus.

14. In a telephone exchange system having a frame in which telephone line circuits are ,connected to switchboard apparatus, and means for connecting phonograph control and talking circuits to said telephone line circuits in said frame including a detachable plug whereby some of said phonograph circuits are connected to the outgoing telephone line while other of said phono- J graph circuits are connectedto the switchboard.

15. In a'telephone exchange system having a switchboard in which a plurality of telephone circuits terminate for interconnection via jacks on on said switchboard, connecting cord circuitsfor i connecting said lines for telephonic communica tion phonograph control and talking circuits, and a plurality of connecting plugs adapted to fit said jacks, each of said plugs being connected to one of said phonograph control and talking circuits whereby said circuits can be connected to any of the telephone circuits via the jacks connected to same, while permitting the interconnection of any telephone circuit so connected to s a phonograph circuit, with any other telephone circuit via one of said connecting cordcircuits. 17. In a telephone system, telephone line circuits, means for connecting said circuits includ ing a cord circuit having supervisory means said signal relay and contacts thereon, and a plug whereby said pheno therein, a phonograph 'circuitand means independent of said cord circuit for connecting same to any of said telephone lines, and means in said phonograph circuit for controlling said supervisory means.

18. In a telephone system, a called and a calling telephone line circuit, a cord circuit connecting said lines and having answering and calling supervisory signals, a phonograph circuit including a phonograph having a talking circuit connected independently of said cord circuit to the calledcircuit, and means in said phonograph circuit for controlling said calling supervisory signal and holding same in non-displayed position until the connection between said called and calling lines is broken by the disconnection of the cord circuit from the called line.

19. In .a telephone system, a called and a calling telephone line circuit, a cord circuit connecting said lines and having answering and calling supervisory signals, a phonograph circuit including a phonograph having a talking circuit connected independently of said cord circuit to the called circuit, and means in said phonograph circuit for controlling said calling supervisory signal and holding same in non-displayed position until the completion of a predetermined period of operation of said phonograph.

20. The combination as claimed in claim 18 wherein the phonograph mechanism has a switch controlling the supervisory signal in the called line side of the cord circuit.

21. In a telephone system,

a telephone line, a

phonograph circuit connected thereto including a phonographand means for operating the same, a cord circuit for connecting said line to other lines, means in said cord circuit for starting the operation of said phonograph, and means in said phonograph circuit operable by current supplied via said cord circuit whereby upon the disconnection of said cord circuit from said telephone line the operation of said phonograph will be stopped.

22. The combination as claimed in claim 21 wherein the phonograph mechanism has a switch controlling the connection of the phonograph circuit to the telephone line.

23. In a telephone system, a telephone line, cord circuits having ringing keys for connecting ringing current to said line and means for supplying operating current thereto for the operation of a telephone, a phonograph circuit connected to said line including a phonograph and means for operating the same, means in said phonograph circuit responsive to said ringing current for starting said phonograph, and means in said phonograph circuit responsive to the disconnection of said operating current for stopping said phonograph.

24-. The combination as claimed in claim 23 including a repeating coil having windings connected to and disconnected from said telephone line by the sequential operation of both said means.

HARRY R. VAN DEVENTER.

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