US239261A

US239261A - Egbert m

Info

Publication number: US239261A
Authority: US
Publication date: 1881-03-22
Anticipated expiration: 1898-03-22

Description

(NOM0de1.)

R. M. & W. V. LOCKWOOD.

Coil for Telephones.

No. 239,261. Patented March 22,1881.

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UNITED STATES PLACE.

PATENT OFFICE.

ROBERT M.v LOOKWOOD AND WILLIAM V. LOGKVVOOD, OF NEW YORK, N. Y., ASSIGNORS TO THE MOLECULAR TELEPHONE COMPANY, OF SAME COIL FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 239,261, dated March 22, 1881. 'Application filed October 7, 1880. (No model.)

To all whom it may concern:

Be it known that we, ROBERT M. LOOK- Woon and WM. V. LOOKWOOD, of the city, county, and State of New York, have invented certain new and useful Improvements in Ooils for Telephones for the Transmission of Vocal Sounds, &c., of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, in

IQ which- Figure 1 represents our improved coil in perspective, and an arrangement of wires, showing the connection of the same with the batter receiver, &c. Fig. 2 is a perspective view of the coil enlarged and partly broken awayto show the half-connection of the second wire with the wire forming the coil; and Fig. 3 is a detail view, showing one way of forming said half-connection.

Our invention relates to a novel manner of forming or winding the coil, whereby we get a second wire, leading from the coil at a point at or near its center, without breaking the single wire of uniform size forming the coil, as herein. fter explained.

The us .al method of forming the coils or helices used for telephonic and analogous purposes is w' ll understood, and need not be here described.

In the construction of our coil, we take, by preference, a core or magnet, A, and wrap the same with wire wound thereon-in the usual manner, until the coil is about one-third (more or less) wound, the end of the wire beginning the coil projecting at a, and being connected with the battery, as hereinafter explained. WVhen the coil is thus about one-third wound a second wire is attached thereto by ahalt-connection and carried out therefrom, as shown 40 at 1), without breaking the main wire, which is then further wound until the coil is completed, terminating in the outer end or wire, a. By this arrangement we get three ends, a, a, and b, projected from the coil. The first named is 5 shown as connecting the coil directly with the battery B, which is also connected by a wire, (0 with the transmitter, (represented at D,) and by a half-connection with a wire, d, with the ground, as shown. The second wire, I), is connected directly with the transmitter, and the third wire or end, a, of the main wire of the coil is connected with the receiver 0, which, in turn, has a wire, d, connecting it with the ground.

Tracing the wire a from the receiver, through which it passes to the ground on one side, it will be seen that it passes thence through the outer part of the coil to the wire I), from which point it has two directions, constituting a split circuit, one portion going to the ground through the transmitter, the other going through the inner part of the coil and the battery to the ground, thus leaving, through the connection of the battery with the transmitter, aba-tterycircuit on the line, forming a battery telephone-circuit.

By this construction of coil we get what we term a third or telephone current, dif' fering from and independent of the battery and induction currents, but depending on the battery-current to produce it, and one which is found, in practice, to be peculiarly adapted to telephonic purposes.

The coil may be constructed or wound in the usual way, except in theparticularspointed out, and the connections and half-connections described may be made in the usual or any preferred form. We do not wish, therefore, to be confined to the specific form and arrangement of the wires in connection with the battery and the transmitting and receiving devices, so long as the feature of the second wire introduced into the body of the coil is preserved and a third or battery telephonecircuit is formed through the interposition of said wire, as explained.

hat we claim as new is 1. The magnetic coil or helix formed from a single main wire, in combination with a second wire introduced into the body of said coil and connected with the main wire, substantially as and for the purpose described.

2. The combination of the magnet or core, the single main wire wound thereon and forming the coil, and the second wire introduced 5 into the body of the coil and connected with the main wire, substantially as described.

ROBERT M. LOOKWOOD. M. V. LOOIUVOOD. Witnesses:

G. H. HANKINSON, JOHN J. SToLLER.