Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 591
Scale.—i inch:=l foot. … Scale.—i 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 arc divisible int..the genera of lifting and sliding valves. Sliding-valves are generally employed to admit the steamalternately above and below the pistons of engines,…
Mechanical engineering · Mechanics · Engineering
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