International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 100
nsists of abox of thin corrugated copper, exhausted of air. An in-crease in the weight of the atmosphere compresses the box,and a reduction in weight admits of the box being expandedby a spring inside. This spring is connected, by a system oflevers, with a dial which indicates the pressure of… … Fio. 304. 1304. How to Determine Difference in Eleva-tions With the Aneroid Barometer.—The formulagiven is that used by the Engineer Corps of the UnitedStates Army. The aneroid barometers used are adjustedto agree with the mercurial barometer at a temperature of32° Fahrenheit at the sea level in…
Railroad engineering
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