Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 550
o determine the pitch of a certain sound we mustfind the number of times the plate revolves in that time,then we-shall have the number of vibrations per secondrequired to produce the note we desire. The arrangementworking in a notched wheel tells us the number of rotationsof the disc. Successive,…
Scientific recreations
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