Word: aneroid
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...ejection, the cable that yanks the seat free also trips a safety lever that sets the parachute's aneroid barometer into action. As the pilot falls, the increasing pressure compresses the metal diaphragm of the barometer. When the barometer records a pressure normal to 10,000 feet (the altitude was considerably higher in Rankin's case, because of the barometric turbulence of the storm), a strong spring releases the ripcord pin and the chute opens...
Supermanometer. The Fischer & Porter Co. of Hatboro, Pa. has an electrically operated pressure gauge (manometer) that it claims is far more sensitive than any competitor. Invented by Swedish-born Frederick C. Melchior, it has four disk-shaped pressure chambers like those of ordinary aneroid barometers. But the movements of the disks in response to changes of pressure do not swing a dial needle. They are read, instead, by an electrical device that detects very small movements. Used as an altimeter, the instrument flashes a red light when raised three inches off a table...
...automatically goes into action even if an airman is inured bailing out of his plane or blacks out at high altitude. Designed for high-flying fighters and bombers, the release is tripped by a timer (to be set before take-off at from one to 26 seconds), includes an aneroid barometer which opens the chute above 5,000 ft. no matter what happens...
...needs to know the barometric pressure throughout the flight. His ordinary altimeter (essentially an aneroid barometer) is not enough, for its readings vary with pressure changes due to either altitude or weather. The problem is solved by the radio altimeter, which measures the plane's altitude electronically. Its readings, combined with barometric altimeter readings, give the actual pressure of the air through which the plane is flying...
...total weight of the radiosonde is only 18 ounces. Air pressure is obtained by a pair of small aneroid bellows; the temperature, by a bimetallic strip which coils with change in temperature; and the humidity, by a single human hair. Each of the three instruments is fitted with a needle which touches a wire, sending out a radio signal by means of a micro-transmitting set. The significance of the signals depends on the time between them. The measurement of this time interval by the operators on the ground provides all the needed information...