Noun
telharmonium (plural telharmoniums)
(historical) An early electric musical instrument for producing music at a distant point or points by means of alternating current. An operator plays a keyboard, and the music is reproduced remotely by a receiving instrument resembling a telephone, but not held to the ear.
Telharmonium Telharmonium console by Thaddeus Cahill 1897 main In 1897 Thaddeus Cahill patented an instrument called the Telharmonium (or Teleharmonium, also known as the Dynamaphone). Source: Internet