Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 519
ment explains perfectly the transmission of spokenwords by means of the string of a telephone, anotherfeontrivance which any one may make for himself withoutany trouble whatever. Two round pieces of cardboard arefitted to two cylinders of tin-plate, as large round as a 162 SOUND. lamp-glass, and… … pronouncing the words into the first cylinder, and thelistener placing his ear against the other. It is easy todemonstrate that sound takes a certain time to pass fromone point to another. When one sees in tne distance acarpenter driving in a stake, we find that the sound pro- HARMONOGRAPH. 163…
Scientific recreations
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