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Scientific American, Vol. 55, No. 16 (1886) (1886)
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of a card held | to revolve at different speeds very complicated figures | finger once during each gyration. The luminous curve against the teeth, a series of little taps are heard, | are produced, sometimes like lacework, sometimes like | in this case appears to havea slow retrograde motion. which… … diameter, when EXPERIMENTS WITH THE SCIENTIFIC TOP. page 244.) © 1886 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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