A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 456
The Phonograph (sound-recorder) is based on theprinciple that different sounds are produced by aerial vi-brations differing in amplitude and rapidity (§ 737). In the simple instrument devised by Edison (see Fig.337), sounds are permanently recorded in the materialform of indentations made in… … C is a cylinder, supported on an axle passing through the standardsA, B. At one end of the axle is a crank, D, and at the other a fly-wheel,E. On the circumference of the cylinder is a narrow spiral groove. Theaxle is a screw, the threads of which are as far apart as those of the groovejust…
Physics
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