The Ondium Péchadre was developed in France by Henri Camille Robert Péchadre in 1929. The instrument was a monophonic heterodyning vacuum tube oscillator based instrument built into a light and portable heart shaped box, in performance the base of the instrument rested on the players knees and the instrument was supported against a table.
The seven octave range of the instrument was controlled – in a way similar to Jorg Mager’s Sphäraphon of 1924 – by moving a pointer around a circular calibrated dial while the left hand controlled the volume of the sound with a velocity sensitive push button device. This allowed the instrument to create a continuous pitch similar to a violin or cello, or by using the volume control, the sound wave’s envelope could be altered to give a more staccato effect.
As with other similar instruments, The Ondium output sound to an amplifier and loudspeaker but, uniquely, was also able to transmit sounds directly via radio waves to a radio receiver or network.
“The Ondium we can report, is of the family of radio-electronic instruments similar to developments by Martenot and others. It differs however in by some points, in particular by this one; The Ondium is the only device of this kind that can be picked up by radio.”Gaston Wiener quoted from ‘L’Ouest-Éclair’ 1935.
Péchadre toured with the Ondium throughout France in the 1930s where, accompanied by an orchestra, he commissioned well known musicians (Gaston Wiener, pianist, Jacques Serres, cellist and Georges Hugo, pianist) to perform popular classical works by Saint-Saëns, Mozart, Delibes and others as well as surprising the audience with the instruments versatility by imitating bird song.
Sources:
‘Le Ménestrel’ Paris 1933.
‘L’Ouest Eclair’ Rennes. 29/10/1931 number 12775.
‘Un appareil de musique radioélectrique; l’ondium Péchadre’ by E. WEISS. La Nature N° 2837 – 15 juillet 1930 Pages 64-65
great invention/my life is dedicated to inventors of telegraph/music/ thanks barton cohen