Coltman, John W.
- Clive Greated
(b Cleveland, July 19, 1915). American physicist and acoustician. After studying physics at the Case School of Applied Science (BS 1937) he obtained the PhD from the University of Illinois. From 1941 to 1980 he held various research and management positions at the Westinghouse Corp. His research into the acoustics of the flute, carried out in a small laboratory at his home, has contributed significantly to what is known today about the behaviour of flutes and organ pipes. Several of his papers are recognised as standard reference material. His theory of feedback and how this relates to the means by which the flautist produces the desired frequencies and loudness is particularly relevant to performance. He also studied the significance of mouth resonance and the effect of mode stretching on harmonic generation. His work on the intonation of both antique and modern flutes and his critical assessment of Theobald Boehm's methods have helped in shaping current views on the historical development of the instrument....