Phonograph

(fo’-no-graf) [jpcovrj, sound; ypa<peiv, to record]. An instrument consisting of a wax-coated cylinder revolving under a stylus attached to a diaphragm. The vibrations of the diaphragm, set in motion by the voice, cause the cylinder to be indented by the stylus. When the cylinder is again revolved the movement of the stylus upon the cylinder throws the diaphragm into vibration and reproduces the original sounds of the voice. 495