Principle involved is balancing of engine cylinder pressure against measured pressure on opposite sides of metal diaphragm of negligible stiffness. Phase of engine cycle to which pressure measurement corresponds is selected by timing device.
A high-speed engine pressure indicator of the balanced diaphragm type
NACA Report
1921
15 pages
14 Figs.
Article (Journal)
English
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A balanced diaphragm type of maximum cylinder pressure indicator
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