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#27
June 22nd 04, 06:48 PM
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"Paul Sengupta" wrote in message
... "Tony Cox" wrote in message ink.net... Assuming the mode C is properly calibrated, that is. How do you measure altitude at 328k feet? Surely a standard barometric device isn't going to work? Paul Below about 50 milliBar, people use a Pirani Gauge, which is essentially a broken light bulb -- the wire gets hotter & changes electrical resistance as there is less air to cool the wire. 50mBar is around 75K ft. Lower than about 10-2 milliBar, Ion gauges are the way to go. They are like broken vacuum tubes. 
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