Tozier, Robert E
naca-tn-634
1938
An optically recording engine-pressure indicator of simple and rugged construction has been developed for use in high-pressure and high temperature combustion research. This instrument is of the diaphragm type and has a natural frequency of about 10,000 cycles per second.
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http://naca.central.cranfield.ac.uk/reports/1938/naca-tn-634.pdf