US242218A

US242218A - moseley

Info

Publication number: US242218A
Authority: US
Publication date: 1881-05-31
Anticipated expiration: 1898-05-31

Description

(No Model-J ZSheets-Sheetl C. MOSELEY. Telephone Transmitter. No. 242,218. Patented May 3|-, |881.

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UNITED STATES PATENT OFFICE.

CHARLES MOSELEY, OF MANCHESTER, GREAT BRITAIN.

TELEPHONE-TRANSM ITTER.

SPECIFICATION'forming part of Letters Patent No. 242,218, dated May 31, 1881. Application tiled April 16, 1881. (No'model.) Patented in England March 4, 1881.

To all whom it may concern Be it known that I, CHARLES MosELEr, ot' Manchester, in the Kingdom of Great Britain, have invented a new and useful Improvement in Telephone-Transmitters, (for which I have obtained a patent in Great Britain bearing date 4th March, A. D, 1881, No. 925,) of which the following is a specification.

My improvements relate to the construction of apparatus for transmitting sound by the aid of electricity, and have for their objects the reduction in the amount of electrical resistance in the transmitter and the attainment of an increased intensity of sound in the receiving-telephone; and it consists in the employment as a tension-regulator or variable-resistance medium of that sulphide of copper variously known as precipitated sulphide of copper,7 protosulphide of copper, and cupric sulphide, the chemical forlnula of which is CuS. This substance I use either in a compressed or in a pulverulent state.

In carrying out my invention I cause the sulphide of copper to form part of an electric circuit, and so place it'thatit may be inuenced by the vibrations of a diaphragm when the latter is set in motion by the action of soundwaves. The variations in the rapidity and amplitude of the vibrations of the diaphragm produce corresponding variations in the conductivity of the sulphide of copper, and therefore in the undulations of the electric current in the circuit of which it is inserted.

My invention may be applied in various ways 5 but in order that it may be more readily understood I will proceed to describe, with reference to the accompanying drawings, some typical examples of the manner in which the same may be carried into effect.

Figures 1 and 2 of the accompanying drawings show, in section and plan, a .method of employing the sulphide of copper in the pulverulent form.

A is a cavity formed in a non-conducting material, such as wood.

B and G are two conductors of electricity, such as platinum or other metal, carbon, or the compressed sulphide of copper, which are attached to the wires E F, communicating respectively with the opposite poles of the battery.

F' is the body of the transmitter. G is an open mouth-piece, and H is the diaphragm. The cavity A is loosely filled with the pulverulent sulphide of copper, which, being thenin contact with the conductors B O, forms part of the electric circuit.

In Figs. 3 and 5 and their respective side elevations, 4 and 6, compressed sulphide of copper is employed for the blocks B B and the pencils C O. A' A' are the diaphragms, upon which are mounted the blocks B B, between which the pencils C C are freely suspended.

In Fig. 3 opposite blocks are connected with the wires E F.

In Fig. 5 one of the blocks, B', is mounted on the center ot the diaphragm, the other blocks being arranged around it, so that the pencils may be suspended between the central block and the other blocks in radial directions. One half the number of the outer blocks are in electrical contact by means of the metal strip D D and the other half by means ot' the corresponding strip D' D', the outer blocks being thus divided into two series, one of which is connected to the Wire E and the other to the wire F, communicating respectively with the opposite poles of the battery. The pencils may have their ends reduced in diameter, and are inserted in recesses formed in the blocks.

Fig. 7 shows in section, and Fig. 8 in plan, another example, in which the compressed sulphide of copperis employed. A" is ametallic diaphragm. B" is a line spring, having at its extremity over the center of the diaphragm the platinum points C'. D" is a disk of compressed sulphide of copper, carried by a stouter spring, 'E'. The diaphragm A" is mounted in a castiron ring, F", which carries also the regulatinglever G', this lever being jointed to the ring by the spring H'. At its free end the lever G is bent so as to form an inclined plane, J. At the other end it i's bent toward the diaphragm at a right angle. At the end ot' this bent portion are fixed the springs B" E', which must be carefully insulated from each other. Acting upon the inclined plane is a small screw, K, which, upon being moved inward, depressesthe lever, and on being withdrawn allows it to rise. By this means a greater or less amount of roo pressure may be brought about between the disk of sulphide of' copper D", the platinum points C', and the diaphragm. The electric circuit is completed through the wires E F. The diaphragm is surrounded on its periphery by the india-rubber band O, and is retained in position by the clips P It. One of them, R, be ing longer than the other and pressing upon the diaphragm,'serves to restrain the amplitude of its vibrations. The clip It is prevented from coming into metallic contact with tbe diaphragm by means of a piece of india-rubber tube, S, slipped over it, and its pressure on the diaphragm is regulated by the screw T. The soundwaves are caused to act upon the opposite side of the diaphragm through a suitable mouth-piece. In al1 cases I prefer to make the contacts with the sulphide of copper by means of a conducting material between which and the sulphide no chemical reaction can occur under ordinary circumstances, for which purpose I prefer to use platinum.

Having now described my said invention and shown how the same is or may be carried into effect, I wish it to be understood that I do not limit myself to tbe examples of the application of myinvention shown and described,

which are similar to those ot' well-known transmitters in ordinary use; but

What I claim, and desire to secure by Letters Patent, is-

1. As a tension-regulator or variable-resistance medium in telephone-transmitters, the protosulphide or precipitated sulphide of copper in a compressed or in apulverulent condition, substantially as described.

2. A telepbone-transmitter comprising one 35 or more bodies or masses ot' protosulphide or 1 precipitated sulphide of copper, in combination with conductors for including said bodies or masses in an electric circuit, and a dia phragm for altering by its vibration the electric conductivity ofsaid bodies or masses, substantially as described.

In testimony whereof I have signed this specification in tbe presence of two subscribing witnesses.

CHARLES MOSELEY.

Witnesses:

JOHN H. WHITE, WILLIAM E. KEYS.