3. Theremin
Originally known as Aetherphone, Theremin is a unique musical instrument. The most amazing feature of the electronic instrument is that it is played without physical contact, and was the first one to be so. It was designed by Russian inventor Leon Theremin in 1920 and was named after him. The Theremin consists of two metal antennas which can sense the relative position of the performer’s hands and two oscillators connected to them. The performer moves his hands within the range of the antennas. The distance between one hand and an antenna determines the pitch while the distance between the corresponding others determines the volume. It is actually one of the earliest electronic musical instruments.
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