Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 15
o be in consequence of affinity. AFRICAN BLACKWOOD. See Woods, varieties of. AIR. Pure air consists almost entirely of nitrogen and oxygen gases, with a very small portionof carbonic acid gas. Of 100 parts of air, reckoning by weight, 75.55 parts are nitrogen, 23.32 oxy-gen, and 1.13 carbonic acid… … AIR-GUN. 11 height, or to a column of mercury 30 inches in height, or 14.7 lbs. per square inch at a mean tem-perature. But air and all kinds of gases are rendered lighter by the application of heat, for thenthe particles of the mass are repelled from each other or rarefied, and occupy a greater…
Mechanical engineering
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