Reflection of Sound Using a Reflector
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“Hold a lamp reflector or other large concave mirror directly facing the sun, so as to bring the rays of light to a focus...At some point, W, between F and C, the center of curvature of the reflector, hang a loud-ticking watch, and hunt for the point, X, at which the ear can most distinctly hear the ticking. Moving the reflector will render the sound inaudible.” -Avery 1895
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Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 220
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