. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1844.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 113 STEAM ENGINE, BOILER AND PROPELLER. Peter Borrie, of Princes Square, St. George's in the Kast, Middlesex, engineer, and Mayer IHenry, of Crutched Friars, in the City of London, merchant, for "Improvements in steam engines, boilers, and propeUing ma- c/iiwen/."—Granted Aug. 3, 18« ; enrolled Feb. 3, 1844. The first improvement is for a rotary engine, and consists of a cylindrical case, within which revolves a cyl
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1844.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 113 STEAM ENGINE, BOILER AND PROPELLER. Peter Borrie, of Princes Square, St. George's in the Kast, Middlesex, engineer, and Mayer IHenry, of Crutched Friars, in the City of London, merchant, for "Improvements in steam engines, boilers, and propeUing ma- c/iiwen/."—Granted Aug. 3, 18« ; enrolled Feb. 3, 1844. The first improvement is for a rotary engine, and consists of a cylindrical case, within which revolves a cylinder having four longitudinal openings or recesses in its periphery, into which are fixed four sliding pistons, each oppo- site piston being connected together and acted on by springs. This cylinder is eccentric with the case, and turns upon its axis, which passes through the ends of the case and also through stuffing Steam is admitted at one side and near tlie upper part of the case, the force of which acting upon one of the pistons causes the Interior cylinder to revolve, the steam escaping as the piston upon which it impinged passes the eduction port, which is on the opposite side, and in this manner the pistons are alternately acted upon, and rotary motion is obtained. This engine differs from one for which a patent was granted June 7th, 1S42, to Mr. John Woodcock, of Manchester, in this particular, that Mr. Borrie employs a double acting air-pump, which is worked from a crank fixed atone end of the main axis, and which may probably have some claim to novelty. Fig. 1, shows a section of this air-pump, which is open at both ends ; a a, we will suppose to be the induction passages leading from the condenser, and each being provided with a valve opening inward ; bb, are the eduction ways and which are also provided with valviis opening outward ; it will be clearly seen that the motion of the piston within the pump barrel e, will be double acting. Fig. 1. Fig. 2. \v
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