US340853A - Telephone-transmitter - Google Patents

Description

(No Model.)

T E. BBRL'I NER. TELEPHONE TRANSMITTER.

Patented Apr. 27, 1886.

INVENTOR' I WITNESSES u. PETERS. mmmyw. wmmm o. c

. UNITED STATES-- PATENT OFFICE.

EMILE BERLINER, OF \VASlIlNG-TON,DISTBIGT COLUMBIA.

TELEPHONE-TRANSMITTER.

EJPEUIFIUATION forming part of Letters Patent No. 340,853, dated April 2'7, 1886.

Application filed August 17, 1885. Serial No 174,610. (No model.)

To ctZZ whom it may concern.-

Be it known that I, EMILE Bnnmnnn, re siding at Washington, in the District of Golumbia, have invented certain Improvements in Telephone-Transmitters, of which the following is a specification.

My invention relates to telephonic trans mitters of that class in which a variation of contact produces a variation in the strength of current. Transmitters of this general type have been devised heretofore which employ as the current-varyingmedium a number of balls or spheres of col'iducting material held between. conducting-plates. These balls or globules have sometimes been made of 1netal such as lea-d shot-but balls of carbon have been found most suitable for this purpose. In practice,however, it has been found extremely diflicult, in fact almost impossible, to produce these small. carbon spheres of exactly the same size, which is aneccssary condition in instruments of this class, since otherwise the upper dish or plate does not rest evenly upon the balls, and in consequence more or less of the latter are not included in circuit.

In addition to the initial dilficulty of cutting or to rning the carbon pieces into the form of perfect splilcres of uniform size, there is still greater di'l'lliculty in preserving this uniformity during the process of smoothing and polishing the balls. As will be readily understood, a very slight variation in size will detract from the eiliciency of the instrument.

The present invention is based upon the discovery that the diflicultiesv above stated may be obviated without sacrifice of the advantages attending this form of instrument by making the carbon pieces in the form of pen oils or rods 'i. (2., making their shape cylindrical instead of spherical, it being practically a siinple matter to shape pieces of carbon into rods or cyliln'lers of uniform diameter.

The construction of a transmitter inaccordance with the invention is as follows: One elect-rode is a conducting plate or diaphragm, preferably of carbon, which is rigidly fixed in position, "Upon this platerests a series of cylindrical carbon sticks varying in length from the diameter of the plate or diaphragm to the chord of a small are thereof.

' Section A is recessed to receive the metal ring 1', upon which rests the conducting plate or diaphragm 0, preferably of carbon. The casesection 13 is a ring having a flange to fit the recess in A. The two sections are held firmly together by screws or a, thus clamping ring I and diaphragm G firmly in position. Upon diaphragm (3 there are a series of carbon cylinders, l), varying in length, as shown in Fig. 2, from about the diameter of the recess in case-section B to the chord of a small are thereof. These cylinders are free to move, and rest by gravity upon diaphragm C.

E is a plate of conducting material, as carbon, resting by its gravity upon the cylinders 1). One circuit terminal, '1, is connected to plate 1*]. Thesecond terminal, e, is connected to diaphragm 0 through ring I.

The sounds for transmission are directed upon diaphragm 0 through mouthpiece G.

What I claim, and desire to secure by Let tors Patent, is

1. In a telephone-transmitter, the combina' tion of aseries of carbon rods resting loosely between a conducting diaphragm and a loose conductingweight.

2. In a tolephonetransmitter, the combina tion of two plates of conductil'ig material forming the two electrodes of a circuit and a series of carbon cylinders located between them.

3. In ittelephoue-transm'itter, the combination of two carbon plates forming the electrodes of a circuit and a series of carbon cyl- I indeis located between them.

4.. In a batterytransmitier, the combination of a plate and diaphragm of conducting material forming one electrode of a circuit,

and two or more carbon cylinders forming the second section, a series of carbon-cylinders other electrode of saidcircuit. resting upon the diaphragm and a carbon 5. In a battery-transmitter, the combinaplate resting upon the cylinders. 15 tion of a carbon plate or diaphragm rigidly In testimony whereof I have signed myname 5 fixed in position, a series of carbon cylinders to this specification, in the presence of two resting upon said plate by their own gravity, subscribing witnesses, this 14th day of August, and aplate of carbon resting upon the said cyl- 1885. inders. 6. In atelephone-transmitter, the combina- IO tion of an inclosing-case in two sections, in Witnesses:

one of which islocated a metal ring,and acar- GEO. \VILLIs PIERoE, bon diaphragm firmly held in position by the THOS. D. LOOKWOOD.

EMILE BERLINER.

It is hereby certified that in Letters Patent N 0. 340,853, granted April 27, 1886, upon the application of Emile Berliner, of Vvashington, District of Columbia, for an improvement in Telephone-Tranemitters, an error appears in the printed specification requiring the following correction, viz: In line 99, page 1, the word and should read or; and that the Letters Patent should be read with this correction therein to make it conform to the record of the ease in the Patent Office.

Signed, conntersigned, and sealed this 11th day of May, A. D. 1886.

[SEAL] H. L. MULDROW;

Acting Secretary of the Interior. Countersigned M. V. MONTGOMERY,

Commissioner of Patents.

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