- Mark Hoffman
(b Hanau, June 20, 1839; d Hanau, Jan 13, 1900). German acoustician, son of Georg Appunn. At the Leipzig Conservatory he continued the acoustical experiments of his father, especially the determination of vibration ratios of very high tones by optical means, and constructed fine acoustic apparatus. He devised a new shape for the glockenspiel, with right-angled metal rods in a circular arrangement and a metal half-sphere above as a resonator....