Also known as the Fingerboard Theremin, instead of strings, it has a flexible plastic film fingerboard which, when touched, produces a tone. As long as the finger remains depressed, a tone is sustained. The volume is controlled by a lever on the player's right and the tone color is controlled by knobs, and the sound is amplified by an external amplifier.

Invented in the 1920's by Lev Termen.

Find out more info, see rare pics, and read one of the only interviews with Leon Theremin in our Featured Sections area.

All images courtesy of the National Music Museum
University of South Dakota, Vermillion, SD.