SOUND POWERED TELEPHONES
Sound Powered Telephones
TMC Sound powered telephones
Sound Powered Telephones?
The investigation concluded that most ships phones were inadequate as they were either powered from local batteries or from a central source.
A system was needed that did not use power and the US made it mandatory that ships phones were sound powered, with other countries following.
Sound phones were not a new invention as Bell's original electro-magnetic telephone worked with no power source.
Last revised: November 29, 2019