US737711A - Anti-induction telephone system. - Google Patents

Description

- 'PATENTED SEPT. l, 1903 W. GONDON &: A. BARRETT.

ANTI-INDUCTION TELEPHONE SYSTEM.

APPLICATION FILED MAR. 24, 1902.

so MODEL.

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iatented September 1,

PATENT OFFICE.

IVILLIAM CONDON AND ALBERT BARRETT, OF KANSAS CITY, MISSOURI.

ANTI-INDUCTION TELEPHONE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 737,711, dated September 1, 1903.

Application filed March 24, 1902. Serial No. 99,574. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM CONDON and ALBERT BARRETT, citizens of the United States, residing in Kansas City, county of Jackson, and State of Missouri, have invented a new and useful Improvement in Anti-Induction Telephone Systems, of which the following is a specification, reference being had therein to the accompanying drawings, forming a part thereof.

Our invention relates to improvements in telephony.

The object of our invention is to provide means for preventing in the receiving-telephone disturbing sounds due to the inductive action of other than the telephonic currents.

Our invention provides atransmittingcircuit with means for causing telephonic currents to traverse the same, a secondary circuit operated by ind nation from the transmitting-circuit, a telephone-receiver in the said secondary or receiving circuit, and means for varying the inductive efficiency between the two circuit-s.

Our invention provides, further, means for varying oppositely the strength of the telephonic currents, thus compensating for the variation in inductive efficiency between the two circuits.

Our invention provides, further, means by which the variation of inductive efficiency and the variation of the strength of the telephonic currents may be simultaneously accomplished.

Ouriuvention provides, further, means for varying the efficiency between the transmitting and receiving circuits by cutting in or cutting out from inductive action portions of one of said circuits.

Our invention provides, further, means for varying the inductive efficiency between the transmitting and the receiving circuits, consisting in cutting in or cutting out from inductive action portions of one of the windings of an induction device, consisting of two elements inductively related to each other, one element thereof being disposed in the transmitting and the other element in the receiving circuit.

Ourinvention provides,still further,atransmitting-circuit, means for causing telephonic currents to traverse the same, a plurality of secondary circuits, a telephonereceiver in each of said secondary circuits, and means for varying the inductive efficiency between the primary and the secondary circuits.

Other features of novelty are hereinafter fully described and claimed.

In the accompanying drawings we have shown various means for carryingour invention into efiect.

In practicing our invention we prefer to place the transmitters and battery or other source of electrical generation in series in the line or transmitting circuit. The receiving-telephones are placed in secondary circuits operated by induction from the transmitting-circuit. In the event that stray currents get upon the transmittingcircuit by induction or by any other manner our invention provides for the decreasing of the inductive efficiency between the transmitting and the receiving circuits until the disturbances in the receiving-telephones are eliminated and compensating for the weakened effect of the telephonic currents upon the receivers by increasing the strength of the telephonic currents.

Referringto the drawings, Figure 1 is a diagrammatic view of a telephone system embodying the features of our invention in which the inductive efficiency is varied by movement of a portion of one circuit in the inductive field of the other circuit. Fig. 2 is a similar view showing a modification of our system in which the inductive efficiency is varied by cutting in or out from inductive action certain portions of the transmitting-cm cuit. Fig. 3 is a view similar to Fig. 1 of one end of the transmitting-circuit, showing another modification in which the inductive efliciency is varied by cutting in or out of inductive action certain portions of the receivingcircuit. Fig. 4 isa view of still another modification in which the inductive efficiency is varied by changing the position relative to the two circuits of a reinforcing agent, such as an iron core of an induction-coil. In Figs. 1, 2, and a means are shown by which the variation of the strength of the telephonic currents and the variation of the inductive effi: ciency is accomplished simultaneously.

Similar characters of reference indicate similar parts.

1 and 4 indicate two stations connected by the two line transmitting- wires 2 and 3.

5 indicates a wire carrying currents from which are induced stray currents traversing the wires 2 and 3.

6 indicates the primary wire of an induction-coil located one at each station, and 7 indicates the secondary wire thereof.

8 indicates a secondary circuit, one at each station, and 9 indicates a receiving-telephone in each of said secondary or receiving cir-- cell may be replaced by any desired number of cells or by any other suitable unit of electric generation.

In the form of ourinvention shown in Fig. 1 the primary wire of the induction-coil at each station is secured at one end to a post 16 and at the other end to a plug 17. At station 1 are provided sockets 18, 19, and 20, insulated from each other and connected by wires 22, 23, and 24 with the wires 14 and 15 and one pole of the battery, the other pole of the battery being connected to the linewire 2. The transmitting-circuit can be made complete by inserting in any one of said sockets the plug 17. At station 4 are provided the sockets 25, 26, and 27, adapted to receive therein the plug 17, attached to one end of the primary wire of the induction-coil at that station. The primary wire of each inductioncoil in this form of our invention is preferably a coiled spring-wire, which when extended or contracted presents more or less coils in proximity to the stationary windings of the secondary wire of the induction -coil. When the primary wire is drawn out, less coils are in proximity to the secondary wire, and the inductive efliciency between the primary and secondary wires becomes decreased. By inserting plug 17 at station 1 in the socket 18 only the battery unit or cell 11 will be in the circuit. If the plug is inserted in socket 19, two units or cells 11 and 12 will be cut into the circuit. If the plug is inserted in socket 20, all the units will be cut into the transmitting-circuit. In operating this form of our invention the primary wire at station 1 is withdrawn with the plug 17 to a point where the disturbing effects are no longer perceptible in the receiving-telephone 9 at that station. The plug will then have been inserted in the socket, which will cut into the transmitting-circuitthe number of battery units required to compensate for the loss of efliciency due, to moving the wire 6 relative to the secondary wire 7. The operator at station 4 operates his primary wire and plug 17 in a like manner by placing the plug 17 in the proper socket. When the disturbance on the transmitting-circuit decreases in volume, the primary wires at each station may be contracted and the inductive efficiency thus increased and at the same time decreas-' ing the strength of the telephonic currents by cutting out proportionately certain of the battery units.

In the form of our invention shown in Fig. 2 the Wires of the induction-coils are stationary, and the primary wire of each coil is divided into sections by leading therefrom at intervals wires 28, 29, and 30, which are also connected, respectively, with the members 31, 32, and 33 ofa series of sockets composed of the said members and the members insulated therefrom 34, 35, and 36. The members 34, 35, and 36 at station 1 are connected, respectively, to the wires 22, 23, and 24, which are respectively connected to the battery- cells 11, 12, and 13, as shown in Fig. 1. The line-wire 3 is connected at one end with the primary wire of the induction-coil at station 4. The transmitters 10, secondary wires 7, and telephone-receivers 9 are disposed as already described. Plugs 17 are provided to complete the transmitting-circuit through the proper sockets. In operating this form of our invention the inductive efficiency is varied by inserting the plugs 17 in different sockets, thus cutting in or out of the transmittingcircuit portions of the primary wires 6.' With the plugs 17, as shown in this figure, in the sockets composed of members 32 and 35 the circuit will be completed between the line- Wire 2 and the primary of the induction-coil by the wires 29, 38, and 23, the plugs 17, and the socket members 32 and 35, the battery being connected, as already described when referring to Fig. 1. In this position of the plugs 17 that portion of the primary wire of each induction-coil which is connected to the member 33 will be cut out of the primary circuit, thus cutting out also from the inductive action that portion of the secondary wire 7 adjacent to such cut-out portion of the primary. The secondary wire at each station will thus be acted upon only by that portion of the primary wire of each coil located between the Wire 29 and the wire 3. In this condition of the transmitting-circuit the batteries 11 and 12 are cut into the primary circuit. It now the plugs 17 be inserted between the members 31 and 34 at each station, thecircuit will I field, while but one battery unit or cell would be cut into the transmitting-circuit. The inductive efficiency between the primary and secondary wires is thus varied by varying the positions of the plugs 17 with reference to the sockets and the strength of the telephonic circuits is oppositely varied thereby.

In the form shown in Fig. 3 the inductive efficiency between the transmitting and receiving circuits is varied by cutting in or out portions of the secondary wire of each induction-coil from the secondary circuit in which it is located. The different sections of the secondary wire of each induction'coil are connected by the wires 40, 41, and 42 with the socket members 31, 32, and 33, respectively. The opposite socket members 34, 35, and 36 are connected with the secondary circuit 8 at each station by the wires 43, 44, and 45, respectively. One end of the secondary wire 7 is connected to the wire 42 and the other end to the circuit-wire 8. By varying the position of the plug 17 at each station with relation to the socket members diiferent portions of the secondary circuit will be thrown in or out of the inductive action of the primary circuit, thus varying the inductive efficiency be tween the primary and secondary circuits. The telephonic currents traversing the primary circuit may be then varied by any suitable means. 7 In the form of our invention illustrated in Fig. 4 the inductive efficiency between the transmitting and secondary circuits is varied by varying the action of a magnetic reinforcing agent 46. The core 46 is provided with a handle 47, having a contact-flange 48, adapted to make and complete the circuit through any one of a series of contacts 49, 50, 51, and 52. The difierent battery-cells are connected as already described, one pole being connected to the line-wire 2, to which the contact 49 is also connected. The contact 52 is connected to the other pole of the battery, and the contacts 50 and 51 are connected, respectively, to the wires 14 and 15. One end of the primary winding is connected to the line-wire and the other to the handle 47,.which with the flange 48 forms part of the primary circuit. By drawing out the core 46 the flange 48 will make contact successively with the contacts 50, 51, and 52, thus cutting in, respectively, one, two, or three units or cells. As it is Withdrawn the reinforcing influence on the primary and secondary windings of the induction-coil will become decreased, while the battery-power is being increased, and moving it in the opposite direction will have an opposite effect. Thus the inductive efficiency between the transmitting and receiving circuits will be varied simultaneously with the variation of the strength of the telephonic currents.

In operating the different forms of our invention the inductive efficiency between the transmitting and the secondary circuits is reduced until the disturbing effects of the stray currents are eliminated from the receiving circuits and the strength of the telephonic currents is correspondingly increased. As the disturbance decreases the inductive efficiency is increased, thus permitting a reduction in the strength of the battery required for telephonic purposes.

It is not essential to the operation of our invention that the variation of the current be accomplished simultaneously with the variation of the inductive efficiency between the circuits. In the drawings We have shown in the battery single cells; but each of these cells can be duplicated or increased to suit the occasion. In operating our invention the operator at one station controls the strength of the current. The variation inefficiency at each station is controlled by the operator at that particular station.

Other modifications than those shown and described may be made without departing from the spirit of our invention.

Having thus described our invention, what we claim,.and desire to secure by Letters Patent, is-

1. A telephone system comprising a primary electrical circuit, a secondary electrical circuit operated by induction therefrom, a telephone-receiver in the secondary circuit, means for causing telephonic currents to traverse the said primary circuit, and means for varying the inductive efficiency between the primary and secondary circuits, substantially as described.

2. A telephone system comprising a primary electrical circuit, a plurality of secondary electrical circuits operated by induction therefrom, a telephone-receiver in each of said secondary circuits, means for causing telephonic currents to traverse said primary circuit, and means for varying the inductive efficiency between the primary and said secondary circuits, substantially as described.

3. A telephone system comprising a primary electrical circuit, a secondary electrical circuit operated by induction therefrom, a telephone-receiver in the said secondary circuit, means for varying the inductive efliciency between the said primary and the said secondary circuits, means for causing telephonic currents to traverse the said primary circuit, and means for varying the strength of the telephonic currents traversing the primary circuit, substantially as described.

4. A telephone system comprising a primary electrical circuit, a plurality of secondary electrical circuits operated by induction therefrom, a telephonereceiver ineach of said secondary circuits, means for causingtelephonic currents to traverse the said primary circuit, means for varying the strength of the said currents, and means for varying the inductive efficiency between the primary and the said secondary circuits, substantially as described.

5. A telephone system comprising a .primary electrical circuit, a secondary electrical circuit operated by induction therefrom,a telephone-receiver in the said secondary circuit, means for causing telephonic currents to traverse the primary circuit, means for varying the inductive efficiency between the two circuits, and means for correspondingly but oppositely varying the strength of the telephonic currents in the primary circuit, substantially as described.

6. A telephone system comprising a primary electrical circuit, a plurality of secondary circuits operated by induction therefrom, a telephone-receiver in each of said secondary circuits, means for causing telephonic currents to traverse .the primary circuit, means for varying the inductive elficiency between the primary and the secondary circuits,'and means for correspondingly but oppositely varying the strength of the telephonic currents in the primary circuit, substantially as described.

7. In a telephone system, the combination with a primary electrical circuit, of means for causing telephonic currents to traverse the said circuit, a secondary circuit, a telephone receiver in said secondary circuit, an induction device comprising two elements inductively related to each other, one of said elements being located in the said primary circuit and the other of said elements being located in the said secondary circuit, and means for varying the inductive efficiency between the two said elements,substantially as described.

8. In a telephone system, the combination with a primary electrical circuit, of means for causing telephonic currents to traverse the said circuit, a secondary circuit, a telephone-receiver in said secondary circuit, an induction-coil comprising a primary and a secondary wire, the primary wire being .located in the said primary circuit and the secondary Wire being located in the secondary circuit, and means for varying the inductive efficiency between the primary and secondary wires of the ind notion-coil, substantially as described.

9. In a telephone system, the combination with a primary electrical circuit, of means for causing telephonic currents to traverse said circuit, a plurality of secondary circuits, a telephone-receiver in each of said secondary circuits, an induction-coil for each of said secondary circuits, the primary wires of said induction-coils being located in the said primary circuit and the secondary wires thereof being located respectively in the secondary circuits, and means for varying the inductive eiiiciency between the said primary wires and the secondary wires of the respective induction-coils, substantially as described.

10. In a telephone system, the combination with a primary electrical circuit, of means for causing telephonic currents to traverse the said circuit, a secondary circuit,.a telephonereceiver in said secondary circuit, an induction device comprising two elements inductva /xii ively related to each other, one of said ele ments being located in the primary circuit and the other of said elements being located in the secondary circuit, means for varying, by increase or decrease, the inductive efficiency between the said two elements, and means for correspondingly but oppositely varying the strength ofthe telephoniceurrents traversing the primary circuit, substantially as described.

11. In a telephone system, the combination with a primary electrical circuit, of means for causing telephonic currents to traverse the said circuit, a plurality of secondary circuits, a telephone-receiver in each of said secondary circuits, a plurality of induction devices comprising each two elements inductively related to each other, one element being located in the primary circuit and the other element being located in one of said secondary circuits respectively, means for varying, by increase or decrease, the inductive efficiency between the respective elements of the said induction devices, and means for correspondingly but oppositely varying the strength of the telephone-currents traversing the primary circuit, substantially as described.

12. In a telephone system, the combination with a primary electrical circuit, of means for causing telephonic currents to traverse the said circuit, a secondary circuit, atelephon'ereceiver in said circuit, an induction-coil having a primary and a secondary wire, the primary wire being located in the primary circuit, and the secondary wire being located in said secondary circuit, meansfor varying the inductive efficiency between the said primary and secondary wires of the inductioncoil,

and means for oppositely varying the strength of the telephonic currents traversing the said primary circuit, substantially as described. 13. In a telephone system, the combination with a'primary electrical circuit, of means for causingtelephonic currents to traverse the said circuit, a plurality of secondary circuits, a telephone-receiver in each of said secondary circuits, a plurality of induction-coils the primary wires of which are located in the said primary circuit and the secondary wires of which are located one in each of said secondary circuits respectively, means for varying the inductive efficiency, by increase or decrease, between the primary and secondary wires of each of said induction-coils, and means for oppositely varying the strength of the telephonic currents traversing the said primary circuit, substantially as described.

14. A telephone system comprising a transmitting-circuit, a receiving-circuit a portion of which is inductively related to a portion not the transmitting-circuit, means for varying the extent of that portion of one circuit which is inductively related to the other circuit, and means for causing telephonic currents to traverse the transmitting-circuit, I

substantially as described.

15. Atelephone system comprising a trans- IIO mitting-circuit, a receiving-circuit a portion of which is inductively related to a portion of the transmitting-circnit, means for varying, by increase or decrease, the extent of that portion of one circuit which is inductively related to the other circuit, means-for causing telephonic currents to traverse the transmitting-current, and means for varying the strength of such currents, substantially as described.

16. A telephone system comprising a transmitting-circuit, a secondary circuit, means for causing telephonic currents to traverse the transmitting-circuit, an induction-coil provided with primary and secondary Windings, one of which is disposed in the transmitting and one in the receiving circuits, and means for cutting in or cutting out portions of one of said windings from its circuit, substantially as described.

17. A telephone system comprising atransmitting'circuit, means for causing telephonic currents to traverse the said circuit, a secondary circuit, an induction-coil having its primary wire disposed in the transmittingcircuit and its secondary wire in the secondary circuit, and means for cutting in or cutting out from the transmitting-circuit por tions of the primary wire of said inductioncoil, substantially as described.

18. A telephone system comprising a transmitting-circuit, means for causing telephonic currents to traverse the said circuit, a pluality of secondary circuits, a plurality of induction coils each having its primary Wire disposed in the transmitting-circuit and the secondary wires disposed respectively one in each of said secondary circuits, and means for cutting in or cutting out from the primary or transmitting circuit portions of the primary wires of saidinduction-coils, substantially as described.

In testimony whereof We have signed our names to this specificationin presence of two subscribing witnesses.

WILLIAM GONDON.

ALBERT BARRETT.

\Vitnesses:

WARREN D. I-IoUsE, G. W. DUVALL.

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