sheet-coating

Updated: August 26, 2026

The phonograph consists of three principal parts, the sender or funnel-shaped tube, with its open mouth-piece standing toward the operator; the diaphragm and stylus connected therewith, which receives the sound spoken into the tube; and thirdly, the revolving cylinder, with its sheet-coating of tin-foil laid over the surface of a spiral groove to receive the indentations of the point of the stylus.

- Notable Events of the Nineteenth Century: Great Deeds of Men and Nations and the Progress of the World