Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 550
Sound Figures. to find the pitch of By maintaining this rate for aminute or less, and setting the gear to tell the revolutions,the number will be found marked on the dial of theapparatus. So by multiplying the number of revolutionsof the disc by the number of the holes, and dividing theproduct by…
Scientific recreations
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