Van Nostrand's eclectic engineering magazine . the thrust along the soffit at that point, the soffit and may pass through the mid- which is also = T=H. Then the lever armmust be equal to A K. Hence v\re see thatthe curve of pressures is a circle parallel to die of the arch ring. This kind of arch may be used for damsor the walls of reservoirs. (See Fig. 40.) Fig. (To be continued.) COMPOUND ENGINES. By a. for Van Nostrands Magazine.* We devote a few pages to the history of • Etude sur les Nouvelles Machines aVapeur Marines. Pre-miere Partie. Economle de Combustible par B
Van Nostrand's eclectic engineering magazine . the thrust along the soffit at that point, the soffit and may pass through the mid- which is also = T=H. Then the lever armmust be equal to A K. Hence v\re see thatthe curve of pressures is a circle parallel to die of the arch ring. This kind of arch may be used for damsor the walls of reservoirs. (See Fig. 40.) Fig. (To be continued.) COMPOUND ENGINES. By a. for Van Nostrands Magazine.* We devote a few pages to the history of • Etude sur les Nouvelles Machines aVapeur Marines. Pre-miere Partie. Economle de Combustible par Bramwell (Tra-duction). Deuxieme Partie. Etufle sur les Machines Com-pound, par A. Mallet. Paris, A. Bertrand, Edileur. Compound Engines; a history heretoforelittle known; which we are able to makecomplete by means of documents that enterinto minute details, and which contain mat-ter instructive and interesting, while they COMPOUND ENGINES. 297 shed light upon !^subjects heretofore ob-scure. The idea of employing the expansivepower of steam is generally attributed toJames Watt. This is shown by the evi-dence of a patent of Jan. 5, 1769, No. process consisted in arresting the intiO-duction of steam a little before the termina-tion of the stroke of the piston, thus re-ducing the pressure at the moment of thereverse stroke; it was not until sometimeafter
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