Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 543
hpiece. Thedrawings will explain the instrument. Mr. Edison also invented a Telephone like Grays, andmade the discovery, that when properly prepared, carbon■would change its resistance with pressure, and that theratio of these changes corresponded with the pressure.This solved the problem of the… … Q Wheii we come to MAGNETISM and Electricity wemay have something more to say respecting the mysteriesof the Teliiphone and its later developments. At present THE PHONOGRAPH. 187 we are only concerned with it as a sound conveyer, and itanswers its purpose admirably, although somewhat liable…
Scientific recreations
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