Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 637
hragm d, made of mica, animal membrane, ormetal, is placed just below the mouthpiece m, see Fig. 102.Both are carried on the bar b pivoted at pp, and adjustableby the screw s, so as to make right contact with the tinfoilround the cylinder. At the centre of the diaphragm iscemented a small plate /,… … Fig. 101.—Historic Phonograph. bar b swung up so that the point n clears the tinfoil.The handle is then turned backwards until the cylinder isbrought to its original position. The bar b is then broughtdown again, the screw s adjusted, and the funnel/ fitted onto the mouthpiece. The handle is now…
Sound
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