تسجيل الدخول

تسجيل

The Phonograph

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-234

2025-11-20

557

invented by Edison, consists of a cylinder of specially prepared wax upon which the vibrations of a diaphragm are recorded by means of a fine metal point or chisel attached to the diaphragm. The waves of sound throw the diaphragm into vibration, this sets the point in motion, and as the wax cylinder is rotated the point cuts a series of spiral grooves. These grooves are made up of minute indentations which correspond to the condensations and rarefactions of the sound waves. By means of a special form of point which takes the place of the cutting tool, and follows in the groove which it has cut, the sound can be reproduced with remarkable fidelity.

Other instruments for the reproduction of sound make use of a disk for the reproducing surface.