The Talking Machine Patent Archive

Patents you could hear

Heated stylus

Patent drawing of a conical phonograph horn with an internal cone-shaped deflector, concave annular and spherical reflectors, a diaphragm, and an electrically heated recording stylus mounted on springs and insulating mica strips.APPARATUS FOR RECORDING SPEECH OR OTHER SOUNDSWilliam Bruening · November 15, 1892Two vertical sectional diagrams of a phonograph recording apparatus showing a corrugated horn, a cone-shaped diaphragm with a stylus, a dome-shaped sound reflector, and a small lamp used to heat the stylus, with labeled parts including horn (H), diaphragm (D'), cone (C), style (S), and support stem (M).APPARATUS FOR RECORDING SPEECH OR OTHER SOUNDSWilliam Bruening · November 22, 1892