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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
am. In practice, these disks are like buttons, and form links in the chain, which is galvanized to prevent rusting. The tubing is made of some light wood and in two longitudinal pieces, the hollow being cut half in each piece, and the sections nailed or bound together. Chain-pumps. The axis of one wheel is supported on the curb, and the other on a post in the bottom of the well, or on a scantling lowered from above. The chain-pump b was first used in the British navy on board the Flora, in 1787. As now used in the English navy, it is formed of a long chain which carries disks at intervals, and passes over sprocket-wheels above and below; the chain passes down a tube called the back-casing, dips into the limber where the bilge-water collects, and up through another tube at whose summit is a cistern. The upper sprocket is turned by a crank, and the tube is made of wood lined with brass. The links are of iron, and each piston consists of two circular brass plates inclosing