US231704A - Electro-chemical receiving-telephone - Google Patents

Description

T. A. EDISON. Electro Chemical Receiving Telephone.

No. 23mm. paxemedm 3%, mm,

I UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, OF llII XLO'lL-KRK, XIHV JERSEY.

ELECTRO-CHEMICAL RECEIVING-TELEPHONE SPECIFICATION forming part of Letters Patent No 231,704, dated August 31, 1.880.

Application filed July '17 157i).

1'?) (all w/wm, it may concern: 1

Be. it known that I, THOMAS A. EDlSOX, ot' lilenlo Park, in the State of New Jersey, have invented a new and useful Improvement in i Telephones, of which the following is a specitication. (Case No. 181.)

The object of this invention is to transmit and reproduce over telegraph-wires speech or other sounds telephonically.

The invention relates to an improved electro-cheuiical receiving-instrument and the method of working such receiving-instrument by placing the same in a tertiary circuit and translating the electric waves which serve to operate it by induction.

In the drawings, Figure 1 represents the apparatus and circuit-connections at one end of the line, and Fig. 2 is asection of the call-hell battery. I Y

A is the transmitter, which consists of two buttons, 3 and 4, made of finely-divided conducting material, such as carbon, and facing f and resting at all times upon each other. :3 and .5 are metallic plates which are perina neatly-secured to these two buttons and serve to connect the conducting-wires to the buttons. These are placed in arecess in an or dinary telephone-case, and a piece of rubber- T cloth,-1, Serves to keep the buttons in position and keep the moisture from them.

- The principle of operation is the same as in my previous applications, in which sound. waves are translated into electrical waves, the device here shown being mere] y a modification thereof.

"This transmitter is connected, in the circuit containing the batteryS and key 9, with a cireuit-closing point, 10, and primary coil of the inductorium B. The key 9 serves to close the circuit in the act of transmitting and to open of the cell there is laid a disk of carbon; on

it when receiving.

11 is the primary coil. coil, which is included in the main circuit by 1 wires 50 and 51. I

The wire 50 proceeds to the earth E, while i 51 passes through the call-bell magnet 25 to point 23, key-lever 22, and to the line. Hence any waves thrown into the secondary wire upon B pass to thewdistant station.

v13 is the tertiary coil. In the circuit of the tertiary coil is the electrochemical receiver 12 is the secondary 5 l withplatina or palladium. experiment that when the arm is tipped with (l. The wire (it) passes to the arm 15 of the diaphragm 16, the end of which arm rests upon the moistened cylinder is.

The cylinder 18 is revolved continuously by means of a spring within the barrel 19 giving motion to the train of gearing at 29. The

wire 61 returns to the other end of the tertiary coil.

20 is a battery which serves to keep a consta'nt current in tertiary circuit.

The porous or chalk cylinder is kept moist by an electrolytic solution, such as water or l acidnlated water, and that part of the arm. 15

whielnr'ests upon the chalk is tipped eithcr l have found by palladium the battery 20 is not required in the circuit 61 to the tertiary coil 13, but. when platinum is used the battery appears to be necessary to obtain the best results.

The operation of the electrochemical receiver is the same as in my application No. 175, except that the cylinder and arm are placed in a tertiary circuit instead of being placed direct upon the line. The object of f placingitina tertiary circuit is to keep the apparatus free from earth-currents, which cause.

alterations in the volume of sound, owing to the marvelous delicacy of the apparatus.

The key .r serves to put the call-battery in circuit and disconnect the bell-magnet 25 andprimary12 from the circuit when callingv the distant station.-

The battery 21 consists of a cell containing fifteen Mario Davy batteries, formed of disks of carbon and zinc fastened together by screws, as in Fig. 2. After being .i'astened together they are boiled in paraiiine, and thcsurtace'ot' the zinc and carbonscraped. Fourteen of these doubledisks are used. At the bottom this is laid a layer of sulphate of mercury paste; on this two sheets of moistened paper; on this is laid a double disk with the zinc side down; on the carbon side another layer .of the mercurial saltzis laid, and the same order of laying continued until the cell is finished. These are then sealed in a glass cell provided with a vent, into which water may be poured and be absorbed by the paper.

I do not herein lay any claim to the trans niitting-instruincnt, nertothehatter [have and the'ci uit-e'unnectimix ut' the same. uil- 15 shown these as adapted to the arrangement of stant'iully as set forth. t-ireuf '-e0nneeti0ns represented. 1 ii. In combination with a diaphragm and it 1 claim as my in\'enti0n 1 moving surface, an arm extending from the 1. 'lhceomhination,witlnt telephonictrunsdiaphragm to the moving Slllfttfl and tipped niitter, receiver, and line, ot'atertiaryinduef with palladium,.t'orthe purpOScs andsuhstnn- 20 tioircoil. one coil ut' which is in the circuit to tinlly ns sct forth. the receiver, the other in the circuit to the Signed by me this 17th day ut' July. l). transmitter, and the thirdinthe circuit to the l 1870. 10 line substantially as set forth. H

l. in cmnbinatiun with the transmittingand receiving inst rumcnts and a tert izugr induction I \\'it ncsscs:

coil and circuits. substantially as set forth, a i h. L. (tnirrix,

cull undlm-nl lmtteryot'thechatrztetcrdcscrihed. i FRA .\'('|t lt. 'l'r'rux'.

THUS. A. lilllhUX.

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