Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 539
d, notdifferent degrees of intensity, or other qualities of tones.It merely sang with its own little trumpet whatever wassung into it; for all the waves were produced by anelectric current of a certain and uniform strength, andtherefore the sound waves were of the same size. But in 1874, Mr. Elisha… … S2 V O ^ s T3 . S * bo1 g o a n 2 M Ea o employed electrical vibrations ot varying strength andrapidity, and so was enabled to reproduce a tune. Sub-sequently he conceived the notion of controlling thevibrations by means of a diaphragm, which responded to PROFESSOR -BELL. 183 every known sound, and…
Scientific recreations
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