The four-way cock is a fluid control valve of considerable antiquity. The valve body has four ports equally spaced round the valve chamber and the plug has two passages to connect adjacent ports. Its was used to control the flow of steam to the cylinder of early double-acting steam engines, such as those designed by Trevithick. This use of the cock is possibly attributable to Papin.
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Four-way cock — Four way Four way , a. Allowing passage in either of four directions; as, a four way cock, or valve. Francis. [1913 Webster] {Four way cock}, a cock connected with four pipes or ports, and having two or more passages in the plug, by which the… … The Collaborative International Dictionary of English
four-way cock — noun mech engineering : a cock connected with four pipes or ports and having two or more passages in the plug by which the adjacent pipes or ports may be made to communicate … Useful english dictionary
Four-way — a. Allowing passage in either of four directions; as, a four way cock, or valve. Francis. [1913 Webster] {Four way cock}, a cock connected with four pipes or ports, and having two or more passages in the plug, by which the adjacent pipes or port … The Collaborative International Dictionary of English
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Rotary engine — Rotary Ro ta*ry, a. [L. rota a wheel. See {Roll}, v., and cf. {barouche}, {Rodomontade}, {Rou[ e]}, {Round}, a., {Rowel}.] Turning, as a wheel on its axis; pertaining to, or resembling, the motion of a wheel on its axis; rotatory; as, rotary… … The Collaborative International Dictionary of English
