Edison's Carbon Telephone. He tried using carbon with the purpose of reducing the delicacy of the instrument.
An illustration of the rotary dial on phones. Each hole corresponds to the number shown. To dial the…
An illustration of communication between a diver and the surface. Q, Battery with switch and bell in…
The Bell receiver reproduces sounds made on the other end of the circuit, from a transmitter of some…
"Instead of the telephone receivers normally used in telegraphs, substitute with galvanoscopes. When…
"A simple telegraph consisting of two telephone receivers, two batteries, and two keys." -Avery 1895
Telegraphy is the long distance transmission of written messages without physical transport of letters.…
An instrument for reproducing sound at a distance by the transmission of impulses through the agency…
A typical phone call, traditionally, is placed by picking the phone handset up off the base and holding…
Edison invented and developed the carbon microphone used in all telephones along with the Bell receiver…
Credit for the invention of the electric telephone is frequently disputed, and new controversies over…
An instrument that converts voice and other sound signals into a form that can be transmitted to remote…
An instrument that converts voice and other sound signals into a form that can be transmitted to remote…
This telephone uses magnets that converts sound into electrical signals to be transmitted over distances…
This telephone wall mount bracket allows you to mount the main unit to a vertical surface. This device…
"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…