Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 551
improvements has 546 NATURAL PHILOSOPHY. been to diminish this space as much as possible. A B is ahighly polished cylinder of glass, which serves as the bar-description of the rel of the pump; within it the piston works perfectly air-improved pump; ^t. The pigton consists 0f washers of leather… … use of oil; shape of thelower end ofpiston-rod; toothed, is elevated and depressed by means of a cog-wheelthat is turned by the handle If. If a thin film of oil bepoured on the upper surface of the piston the friction willbe lessened, and the whole will be rendered more perfectlyair-tight. To…
Mechanics · Acoustics · Optics
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