Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
106 PNEUMATICS. Fig. 34. … valuable use had been made of at-mospheric pressure for many centu-ries, as in pumps, siphons, etc. 140. Figure 34.—Balloons. —Bodies in air (like solids plungedin liquids) lose as much of theirweight as equals the weight of theair displaced. Hence, if a bodyweighs less than an equal volumeof air,…
Physics · Astronomy
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