MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 40
of sound in theair surrounding the body. (The SPEED OF SOUND is1120 feet per sec. in air at a temperature of 15°C., butvaries with temperature, pressure and density). Anaircraft flying at a Mach Number of .85 would betravelUng at 85% of the speed of sound. The Mach Number is found by dividing the… … fig. Ji. Pioneer Altimeter. Fin. ^-- Pioneer Sensitive Altimeter. This instrument is a special form of aneroid baro-meter (a barometer without liquid) which measures thepressure of the atmosphere. The atmospheric pressureat any point is due to the weight of the overlying airabove, which decreases…
Airplanes
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