A Self-Contained Recording Pressure Gauge
David R. Brown, William C. Galloway, Jack B. Robertson, Gene A. Silvey · Review of Scientific Instruments · 1949
This instrument is a self-contained time versus pressure recording device capable of measuring pressures up to 1200 pounds per square inch at frequencies from 0 to 200 cycles per second over a period of five seconds. The instrument is set in operation by the arrival of a pressure wave above a predetermined threshold, triggering a locking mechanism and permitting compressed springs to drive the record surface past an engraving stylus actuated by a pressure-sensitive diaphragm.