Perkins, Henry, 1803-1889, publisher, Haswell, Barrington, and Haswell, printer, McManus-Young Collection (Library of Congress) DLC · Philadelphia : H. Perkins, 134 Chestnut Street · leaf 142
orunder the receiver of an air-pump, from whichthe air has been pumped out, and they will bothreach the bottom at the same time; for gravity,acting independently of other forces, causes allbodies to descend with the same velocity. An apparatus for performing this experimentis shown in the… … 122 FIRE, WATER, AND AIR. SOLIDITY OF AIR. Provide a glass tube, open at each end; close the upper endby the finger, and immerse the lower one in a glass of water,when it will be seen that the air is material, and occupies itsown space in the tube, for it will not permit the water to enterit until…
Scientific recreations
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![An illustration from Io. Bap. Portae Neopolitani de distillatione lib. IX : quibus certa methodo, multipliciq[ue] artificio, penitioribus naturae arcanis detectis, cuius libet mixti in propria elementa resolutio, perfectè docetur (1608)](https://img.insideoutlibrary.com/img/200/ia-iobapportaeneopo00port-44-34.webp)