sound-impulses

Updated: May 23, 2025

As the diaphragm vibrated under the sound-impulses the pressure upon the carbon granules was varied. An electric current was passed through the carbon particles, whose electrical resistance was varied by the changing pressure from the diaphragm. Thus the current was thrown into undulations corresponding to the sound-waves, and passed over the line and produced corresponding sounds in the receiver.

Walter Kellogg Towers - Masters of Space: Morse, Thompson, Bell, Marconi, Carty