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 599
5 Scale.—$ inch=l foot. … Scale.—1 inch=l foot. Valves.—The function of a valve is to open or close a passage, and all the varieties are divisible intothe genera of lifting and sliding valves. Sliding-valves are generally employed to admit the steamalternately above and below the pistons of engines, except in the case of…
Mechanical engineering
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