Telharmonium

The Telharmonium was an early electronic organ, developed by Thaddeus Cahill in 1897. The electrical signal from the Telharmonium was transmitted over wires; it was heard on the receiving end by means of 'horn' speakers. Like the later Hammond organ, the Telharmonium used tonewheels to generate musical sounds as electrical signals by additive synthesis. It is considered to be the first synthetic instrument due to its ability to generate sounds electromechanically because the sound is produced by moving parts rather than electronic oscillators.