US237132A

US237132A - peters

Info

Publication number: US237132A
Authority: US
Publication date: 1881-02-01
Anticipated expiration: 1898-02-01

Description

Ne Mod l.)- r J I A. W.- ROSE.

Electrica l Telephone.

Not 237,132. Patented Feb. 1,1881.

QW\MRALMX Wb N- RETIRE. PNOYMUTHOGRAPNER, WASNINGTON. D. O.

UNITED STATES PATENT OFFICE.

ALLEN W. ROSE, OF NEW YORK, N. Y., ASSIGNOR TO CHARLES A. CHEEVER, OF SAME PLACE; SAID OHEEVER ASSIGNOR TO HIMSELF AS TRUSTEE.

ELECTRICAL TELEPHONE.

SPECIFICATION forming art of Letters Patent No. 237,132, dated February 1, 1881.

Application filed October 26, 1880. (No model.)

To all whom it may concern:

Be it known that I, ALLEN W. RosE, acitizen of the Dominion of Canada, residing in the city, county,'and State of New York, have 5 invented a certain new and useful Improvement in TransmittingTelephones,of which the following is a specification.

My present invention relates to that class of speaking-telephones-which embodyin their I organization metallic filings susceptible to magnetic or inductive action interposed in -a loose condition in a magnetic field in a galvanic circuit. Several forms of such apparatus and its method of operation form the sub- I ject-matter of other applications filed simultaneously with this, and my present claim is therefore limited to the specific organiza tion shown in the accompanying drawing, which represents a vertical central section through one form of my improved apparatus.

In this case an ordinary tubular case or handle, 0, provided with the usual mouth-piece, is shown with a magnet, M, secured therein. A plunger, Q, capable of moving freely end- 2 5 wise in the guideway of said casing, is located near the mouth-piece, being preferably supported and kept from contact with the magnet M by means of suitable buffers or springs b, thus leaving a cavity or chamber between 0 them, constituting a magnetic field, in which are placed metallic filings in a loose condition. This plunger must be a conductor of electricity, but need not necessarily be a magnet. The filings may be ofiron, steel, aluminium, cobalt,

5 nickel,or other metal capable of inductive action; but thelast-mentioned metalis preferable, as it does not rust on exposure to moisture.

These filings may be in the form of a coarse powder; but I prefer to use them in the form of slivers or filings the length of which is 4.0 three or four times greater than their width or thickness.

A mixture of filings of different magnetic metals or filings and powder of similar or dissimilar magnetic metals may be used. 5

Either a permanent or electro magnet may be employed.

The wire W connects the spindle or magnet M with one pole of the battery and the wire W connects the plunger with the other pole, thus including them, as well as the interposed filings, in a magnetic field in an ordinary galvanic circuit, the normal condition of the filin gs, and consequently their conductive capacity, being varied by vibrations caused by the impingement of sound-waves directly upon the plunger, consequently producing correspond ing variations in the strength of a current traversing the circuit, as is well understood.

I claim herein as of my own invention- The combination, substantially as herein set forth, of the case, the magnet, the plunger, the interposed buffers or sustaining-springs, and metallic filings susceptible to inductive or magnetic action in a magnetic field, and constituting part of a galvanic circuit.

In testimony whereof I have hereunto subscribed my name this 22d day of October, A. D. 1880.

A. W. ROSE.

Witnesses:

WILLARD L. (JANDER, E. G. DAVIDSON.