US586993A - Gustaf dillberg and parnell rabbidge - Google Patents

Description

(No Model.)

G. 'DILLBERG & PLRABVBIDGE. v TELEPHONE SYSTEM.

Patented July 27, 1897.

NITED STATES I KGUSTAF DILLBERG AND PARNELL RABBIDGE, OF SYDNEY, NEW

. WALES.

PATENT 'QFFICE SOUTH TELEPHONE SYSTEM;

SPECIFICATION forming part of Letters Patent NO. 586,993, dated July 27, 1897. Application filed September 9, 1895. Serial No. 562,001.. (No model.)

To all whom it may concern.-

Be it known that We, GUSTAF DILLBERG and PARNELL RABBIDGE, subjects of the Queen of Great Britain, and residents of Sydney, New South Wales, have invented certain new and useful Improvements in Telephonic Instruments Designed for Use on Poorly-Insulated Lines, such as the existing wires of an ordinary wire fence, of which the following is a specification.

The object of this invention is to produce a simple and effective telephonic instrument whereby loud and satisfactory speaking may be obtained. To accomplish this object We proceed as follows and as shown in the accompanying drawing, in which Y Z represent two separate telephonic stations connected'together by line-wire L.

A and A represent calling apparatus; B and B, batteries; E, earth; H and H, rocking lever-switches and receiver-hooks K and K, relay-armatures; M N and M N, coils of wire surroundingiron cores P and P; R and R, receivers; T and T, transmitters; a b cc and a b c e, contact-points; d and cl, centers for 1-1 and H. f and f, are press-buttons connected to H and 1-1, respectively.

WVhen Y desires to call Z, the button fis pressed against contact 0, thereby bringing battery B in circuit "with line L. The current after passing along same travels through receiver B into coils M and N'- to earth, thereby magnetizing core P, which attracts armature K, and consequently connects K with contact 0, thereby establishing a local circuit at Z-viz., battery 13 is enabled to supply current through d h a and bell A K and c to earth, consequently ringing the bell A. v

When Y has called Z by ringing his bell A, as already described, Z will press his button f, thereby notifying Y that he is in attendmice by ringing bell A, as already described. lVhen Y and Z lift their respective receivers R and R ofi the respective receiver-hooks H and H, the bells A and A are cut out of the circuits and the speaking circuit is established, because 11 and H leave contacts a and a and make contact with b and 1), respectively. The current from batteryB will now pass through H, b, T, and N to E, and from B, through H, b, T, and N, to E, consequently forming two separate local circuits,

We have found this system to be particu-' larly efficient on a leaky line-such, for instance, where the wires of fences have been utilized as the line-wires, the current leaking away at the parts X X, where the wires are attached to the fence-posts.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a telephone, the combination of the speaking-circuit, a core, the two coils thereon, the call-circuit, one of said coils being connected in the speaking-circuit and the other in the local-battery circuit, the armature of the call-circuit being arranged to be attracted by the said core to close the callcircuit, the said coils acting as an inductioncoil for the speaking-circuit and as a relay for the call-circuit, substantially as described.

2. Ina telephone, the combination of the speaking-circuit, the call-circuit, an induction-coil having its primary and secondary coils in series inthe speaking-circuit and an armature controlled by said induction-coil to control the call-circuit, substantially as described.

In witness whereof we have hereunto set our hands in the presence of two Witnesses.

GUSTAF DILLBERG. PARNELL RABBIDGE. WVitnesses:

- W. WALKER,

U. W. ALEXANDER.

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