US340707A

US340707A - Telephonic repeater

Info

Publication number: US340707A
Authority: US
Publication date: 1886-04-27
Anticipated expiration: 1903-04-27

Description

(No Model.)

' T. A EDISON. TBLEPHONIG REPEATER Patented Ap rp27, 1886.

INVENT OR chat UNITED STATES PATENT OFFICE.

THOMAS A.1EDISON, or MENLO PARK, NEW JERSEY.

TELEPHONIC nape/wen.

SPECIFICATION forming part of Letters Patent No. 340,707, dated April 27, 1886.

Application filod December 15, 1884. Serinl'NoI 150,347. (No model.)

To all whom 'it may concern;

Be it known that I, THOMAS A: EDISON, of Mcnlo Park, in the county of Middlesex and State of New Jersey, have invented anew and (Case No. 639;) specification.

The object I have in view is to produce -a telephone-repeater for relaying telephone un-. dnlations from either of two lines to the other, which will operate without the use of switches for changing the line and local circuits in the relay apparatus, and will at the same time produce clear articulation free from the con.-

1 fusion produced by the reciprocal action of the repeating-instruments. 4

A further object is to produce an'arrangement whereby a single combined receiver and transmitter can be-used to relay in either direction'n'ithont the use ofswitch'ingapparatus,

and also to provide means whereby my'devices for relaying in either direction without switches can be used effectively with connected lines of widely-diflerent resistances.

The invcntion'will bebetter understood by reference to the accompanying drawings, in whichhignre 1 is a view principally in dia-- gram'of a telephone repeater embodying my invention, and Fig. 2 a view in detail of the receiving induction-coil.

of which the" following is'aduction-coil O. The induction-

circuits

1 and 2 are formed of wire wound together upon the core, the lines A B being connected'at opposite ends of the core to the two circuits,so asto opposeeach other in their inductive action. The other ends of the induction-circuitsl 2 are connected together and through thesecondary 40, of induction-coil D to earth. The inductioncoil 0 has a third circuit, 3, in which is located the receiver E. This is an electro-motograph receiver, the chalk-cylinder of which is kept rotating constantly by any suitable means. 5 F is a telephone-transniitter of any suitable construction. Its case is connected with the receiver-case by achannel,-a, with closed walls. The transmitter is in circuit with primary-oi D and with a battery, G. I

In speaking over either line the current-un- 'o dulatious will pass through 1 or 2Tof C, and to useful Improvement in Telephone-Repeaters,-

A and B are two telephone-lines, which are connected with difi'ercnt circuits 1 2 of the inearththrough' secondary of D, thengreater resistance of the other line preventing any action 'in the other circuit (2 or 1) 01' 0. The electro-motograph receiver will be operated by in- 51 duction,and will throw sound-waves through channel a ohto the transmitter-diaphragm. The transmitter acting through primary of D the induced undulations in secondary of D will pass out through both 1 and 2 of 0 upon both lines. The induction in C will be neutralized, and the reaction upon the receiver prevented.

For working connected lines of widely-differe'nt resistances adjustable resistances Band 6 R are used for balancing the lines, which resistances are located in shunts around

coils

1 and 2 of inductioncoil C. By adjusting these resistances the action of the induction in the coils l and. 2 can be made equal, so that the inductive action from repeating-coil \D will be neutralized in receiving-coil C.

What I claim is-' 1.. In a telephone-repeater, the combination, with two telephone-lines, of a receiving in- 73 dnction-eoil having two opposingprimary circuits and a repeating induction-coil whose secondary circuit is connected with both the primary circuits of the receiving inductioncoil, substantially as set forth.

- 2. In atelephone-repeater, the combination, with two telephone-lines, of a receiving induction-coil having two opposing primary circuits, a'repeating induction-coil whose secondary is in circuit with both said primary circuits',and a repeating telephone-receiver operated by induction from the receiving induction coil, substantially as set forth.

3. 'In atelephone-repeat'er, the combination, with two telophone-lines, 'of arec'eiving'induction-coil having two opposing primary circuits connected with said lines, a repeatin telephone-receiver in the secondary circuito .such

receiving-coil, a transmitting induction-coil having its secondary in circuit with the opposmg circuits of the receiving. induction-coil, and a repeating telephone-transmitter worked by. the receiver and located in the primary circuit of the repeating induction-coil, substantially as set forth.

4. In a telephone-repeater, the combination, with two telephone-lines,- of a receiving induc- Mon-c011 having two opposing primary cirmm, a repeatinginduction-coil whase seoondary circuit: is connected with both said primary nircuits, and resistances for balancing the linen, substantially asset; forth.

5. In a telephonemepeater, the combination,

, with two teLaphoneJin-es, of'arecaiving inducfiiOIl-OOH having twn opposing primary. cirnmm, arepwfiing inflnction'aoii whas second- :zo my circuit is nonnented with both midi mary circuits, and resismnceslocated in shunts mound such opposing primam gr circuitn for baL ancing the iimes, substantially as set fmsfli.

This specification signed and wibnesnefl this 9th day of December, 1884..

, THOS.- A EDISON.

Wibnesnm:

W lvlnmowwnom, 17mm G. GREENE}, Jr.