Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 277
of two sounding bodies maybe compared without the aid of the ear.,so as to obtain the exact relation between them. This method, which depends on the persistence of visual sensations onthe retina (625), consists in fixing a small mirror on the vibrating body, so asto vibrate with it, and impart to a… … Fig 259 necessary to make the tuning-fork vibrate regularly for a long time. At afew yards distance from the mirror there is a lamp surrounded by a darkchimney, in which is a small hole giving a single luminous point. Thetuning-fork being at rest, the eye is placed so that the luminous point is…
Physics
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