Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 98
op of the re-ceiver in a jet. 306. The Buoyancy of the Air is shownby the apparatus of Fig. 115. A hollowglobe is accurately balancedby a weight of lead. Nowclosing the stop-cock, plac-ing this under a large re- Fig. 114. ceiver and exhausting the air, the globedescends, showing that it is now… … Fig. 115. 307. Upon this principle, bodies weighed in air lose apart of their weight, and all accurate weighing must bedone in a vacuum. So also a light body of given weightcontains more matter than one more dense, but whichweighed in air seems to have the same weight. Or a grammeof feathers is…
Physics
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