A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 166
ewhen dealing with refraction and reflection of light. The methodof experimentation was to make a loud electric spark ; this setsup a single wave in the neighbouring air, or what may be calleda sound-pulse (see p. 35), like a stone dropped in a pond. Now,the condensation produced by a sound-wave… … Fig. 52. fraction of a second after the first, and by means of this thesound-wave is photographed in the position it then occupies.The waves could be caused to suffer reflection and refraction invarious ways before being photographed. In the photographs(Figs. 52, 53, 54) the round black patch with…
Physics
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