Hydraulic

-al , hī-drawl′ik, -al, adj. relating to hydraulics: conveying water: worked by water.— adv. Hydraul′ically .— n.pl. Hydraul′ics , used as sing. , the science of hydrodynamics in its practical application to water-pipes, .— Hydraulic belt , an arrangement for lifting water, consisting of an endle belt fitted with buckets which discharge as they turn over an upper wheel; Hydraulic cement , lime, a cement that sets or hardens under water; Hydraulic jack , a jack or lifting apparatus, by means of oil, ., pre ed by a force-pump against a piston or plunger; Hydraulic mining , a method of mining by which the auriferous detritus is washed down by a powerful jet of water into a sluice where the gold is easily separated; Hydraulic pre , a pre operated by the differential pre ure of water on pistons of different dimensions; Hydraulic ram , an automatic pump worked by the pre ure of a column of water in a pipe, and the force acquired by intermittent motion of the column. [From Gr. hydōr , water, aulos , a pipe.]