Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 224
Fig. !.51.—The phonograph. C is the cylinder onwhich the spiral groove is made. A cylinder isshown (enlarged) beside the instrument. FiQ. 250.—A slide trombone. upon the body of the instrument. 240, The Phonograph. This instrument, now so familiar, was invented by Edison in 1877. Its construction,…
Physics
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