The Talking Machine Patent Archive

Patents you could hear

Multi-chamber diaphragm

Patent drawing showing a four-lobed clover-shaped apparatus with resonant chambers (Fig.1), a sectional view revealing an internal spider-arm mechanism converging to a central stylus point connected to a flaring horn-like tube (Fig.2), and detail views of the diaphragm plates, tensioning pin, and record-making point/wheel (Figs.3-5).APPARATUS FOR THE RECORD AND REPRODUCTION OF SOUNDS.Gianni Bettini · August 13, 1889