The Talking Machine Patent Archive

Patents you could hear

Hydraulic pressure reproducer

Patent drawing with five figures: Fig.1 shows a side view of a recording apparatus with a round diaphragm A atop a rim B, a bifurcated stylus C reaching down to a moving paper fillet R threaded between rollers D and D', and a small liquid reservoir S feeding a capillary tube; Fig.2 is a face view of the same diaphragm A with an induction coil T, battery terminals P and P', and the fillet R passing between two circular rollers; Fig.3 shows a rear view of gear-like rollers E, E1, E3 and E4 engaging the narrower fillet strip r; Fig.4 is a tall vertical cross-section of a cylindrical apparatus with an inner glass cylinder L suspended by a cord over pulleys O to a weight W, dipping into a liquid-filled outer vessel K containing liquid M, with a diaphragm L at the top connected to tubes i and J; Fig.5 is a small detail showing two crossed wires labeled c and c2 forming an X shape on the fillet R.ART OF RECORDING AND REPRODUCING IMPULSES.William H. Cooley · December 24, 1895