ClipArt ETC
Edison's acoustic transmitter.

Acoustic Transmitter

Edison's acoustic transmitter.

"A transmitter or key is a current interrupter manipulated by the operator. It consists essentially of a metal layer, L, pivoted at aa, and conneted to the line by the screw at m which is insultated from the base, and the screw at n which is connected to the base and lever." -Avery 1895

Telegraph Transmitter

"A transmitter or key is a current interrupter manipulated by the operator. It consists essentially…

"The transmitter is a microphone adapted for the transmission of telephone messages and, in general practice, is so used, better results being thus secured than is possible when the transmitter and receiver are identical. In the Blake transmitter, a diagram is supported back of a mouthpiece, as in the Bell telephone."

Blake transmitter

"The transmitter is a microphone adapted for the transmission of telephone messages and, in general…

The Blake transmitter is used in taking voice and transferring it into an electrical signal that can be reproduced by a receiver. Used in telephone systems.

Blake Transmitter

The Blake transmitter is used in taking voice and transferring it into an electrical signal that can…

a transmitter is an electronic device which, usually with the aid of an antenna, propagates an electromagnetic signal such as radio, television, or other telecommunications.

Telephone Transmitter

a transmitter is an electronic device which, usually with the aid of an antenna, propagates an electromagnetic…

"Wireless Telegraphy is a system of transmitting messages between distant points without the use of wires."—(Charles Leonard-Stuart, 1911)

Wireless Telegraph Transmitter

"Wireless Telegraphy is a system of transmitting messages between distant points without the use of…