Termen, Lew, New York 1931
Lender: Andrej Smirnov, Theremin Center Moskau
Moscow 1963
55 x 30 x 35 cm, ca. 31 kg
Wood, keyboard, lamps, mirrors, two metal wheels, photocell, tube amplifier

Video: Andrej Smirnov ├╝ber das Rhythmikon

Each key controls a lamp whose light triggers a repeated tone by means of mirrors, two rotating wheels (one for pitch and one for rhythm) plus a photocell. Pitches and rhythms follow the same arithmetic progression as the harmonic series. When depressed, each of fifteen keys sounds its own specific rhythm, from one to fifteen equal divisions of a beat, on a pitch that corresponds to the one to fifteen partials in the harmonic series. The speed can be regulated independently of rhythm.