Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 567
throughwhich it is escaping. Pistons of this kind are used for quick-running pumps, where a small leakageis not very prejudicial. In early forms of pistons iron packing-rings were employed, forced out byhemp packim* behind them, which packing was tightened by a projecting lip on the follower…
Mechanical engineering -- Dictionaries
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