The young folk's cyclopædia of games and sports ; (1899)
Champlin, John Denison, 1834-1915, Bostwick, Arthur Elmore, 1860-1942, joint author · New York, H. Holt and company · leaf 500
e pencils is fastened upright. If]now the telephone be held to theear while some one scratches thejjboard bearing the pencils, theBscratch will be plainly heard in thaitelephone. In like manner other MILK-LAMP 491 MIND-READING slight noises will be reproduced, suchas the ticking of a watch held… … Microphone. in the same way. Gas carbon canbe obtained at gas-works, or of adealer in electrical supplies, as it isused in electric lights. The reason why the sound ismagnified in the telephone is this :The lead in a pencil (which isreally not lead at all, but graphite),is a substance whose…
Games · Sports · Card games
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