Friedrich Bezold (1842-1908) was a professor at the University of Munich who developed hearing tests with tuning forks, and worked to improved education for the hearing impaired. In collaboration with the physician Adolf Edelmann (1885-1939), he developed the continuous progression apparatus. This example, which consists of wood box containing nine tuning forks and two Galton whistles, was made by Max Kohl in Chemnitz.
Ref: Friedrich Bezold and Friedrich Siebenmann, Text-Book of Otology (Chicago, 1908).
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