Sound : an elementary text-book for schools and colleges (1913)
Capstick, John Walton, 1858- · leaf 227
nder is rotated at auniform rate by clockwork orother means, and is mountedon an axis on which a screw iscut, so that it moves along itsaxis as it rotates. By thismeans the trace made on the wax by the style is in the formof a helix from end to end of the cylinder. In some forms of the phonograph… … 247] PHONOGRAPH, MICROPHONE AND TELEPHONE 217 The air-waves that enter the cone set the diaphragm invibration, and the style cuts a furrow in the wax, the depthof the furrow varying from point to point in accordance withthe varying displacement of the diaphragm. When the cutting of the furrow has…
Sound
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