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Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)

Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 69

An illustration from Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room, 1824, leaf 69
, whilstthe top is covered with eternal snow, perhaps coevalwith the mountain itself. In very dry cold weather, the atmosphere will sus-tain a column of mercury about 31 inches high—infair settled frosty weather, 30£ inches—fair weather,with but little frost, 30—changable and cold, 29£—■rain and… … Illustration. Upon the plate of the air-pump set acommon receiver; the force or pressureof the air which is contained in the re-ceiver being equivalent to that whichacts on the exterior part, it may, likeour bodies, be moved with facility.But as the air is exhausted, the equili-brium is destroyed…

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