Examples of an electromechanical instrument are the teleharmonium, Hammond B3, and the electric guitar, whereas examples of an electronicinstrument are a Theremin, synthesizer, and a computer.
An electromechanical instrument called the Teleharmonium (or Telharmonium) was developed by Thaddeus Cahill in 1897.
Simple inconvenience hindered the adoption of the Teleharmonium: the instrument weighed seven tons and was the size of a boxcar.