Harry Partch Instruments On-Line

From The American Mavericks Site

Harry Partch (June 24, 1901 – September 3, 1974) was an American composer and instrument creator. He was one of the first twentieth-century composers to work extensively and systematically with microtonal scales, writing much of his music for custom-made instruments that he built himself, tuned in 11-limit (43-tone) just intonation.”
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O Frabjous Day The Jobberwack

Hugh LeCaine-Musician & Inventor

Hugh LeCaine 1

One of Hugh LeCaine’s many musical instrument inventions, the touch sensitive organ.

From: http://www.hughlecaine.com/en/

Canadian scientist and composer Hugh Le Caine (1914-1977) has been called one of the “heroes” of electronic music. He was brought up in Port Arthur (now Thunder Bay) in northwestern Ontario. At an early age he began building musical instruments and experimenting with electronic devices. In his youth he imagined “beautiful sounds” that he believed could be realized through new electronic inventions.