Sound Refraction

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“Fill with carbon dioxide a large rubber toy balloon or other double-convex lens having easily flexible walls. Suspend a watch, and place yourself so that you can just hear its ticking. Have the gas-filled lens moved back and forth in the line between watch and and ear until the ticking is much more plainly heard. Use a glass funnel as an ear-trumpet.” -Avery 1895




Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 221


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