Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 724
s the same.If it were turned quicker, the pitch was raised ; if slower, lowered. Thewords registered on the tinfoil could be reproduced two or three times,but with decreasing distinctness, as the tracings gradually become obliter-ated. However, the sheet could be removed from the cylinder, and… … Fig. 319^.—The Graj)hophone. when well regulated clockwork was used for imparting motion instead ofthe winch. Mr. Edison contrived a modification of the machine, whichmade it much easier of manipulation, by substituting for the cylinder aflat plate on which a spiral groove was cut. The plate was…
Inventions
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