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#1
January 10th 05, 09:26 PM
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"jharper aaatttt cisco dddooottt com" "jharper aaatttt cisco dddooottt com" wrote in message news:1105391055.635118@sj-nntpcache-3... .... Do altimeters for higher altitudes have some kind of clever mechanism to deal with the non-linearity of pressure at higher altitudes. I am not an expert in the mechanics of barometer/altimeter construction, but I do not see that it has to be particularly clever. Typically, the metal "can" (which expands and contracts with air pressure) is preloaded with a steel-spring against the air pressure. Isn't the force produced by a steel-spring typically non-linear throughout its expansion... so could not the spring-steel parameters be chosen such that the non-linearity matches air pressure non-linearity closely? 
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