The planesman was provided with a prominent depth gauge to monitor this, usually a circular Bourdon gauge.
2.
Four basic devices for pressure measurement are a piezometer, manometer, differential manometer, Bourdon gauge, as well as an inclined manometer.
3.
In the front and back views of a Bourdon gauge on the right, applied pressure at the bottom fitting reduces the curl on the flattened pipe proportionally to pressure.
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