Une histoire de la croissance de la machine à vapeur . thatusually ith adopté par les inventeurs de l'époque. Il com-menced systématique et un système efficace d'annoncer-ment, et n'a pas perdu de sa possibilité de faire notmerely plans connus, mais bien comprise, même- en matière de de-queue. La Royal Society était alors entièrement organisées, et à ses réunions d'undes il obtient la permission de comparaître avec hismodel des pompiers et d'expliquer son fonctionnement ; et, que the minutes lire, M. La société withshowing Savery divertir son moteur pour élever l'eau par la force du feu. Il a été remercié pour avoir montré l'expérience,

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A history of the growth of the steam-engine . ith thatusually adopted by the inventors of that time. He com-menced a systematic and successful system of advertise-ment, and lost no opportunity of making his plans notmerely known, but well understood, even- in matters of de-tail. The Royal Society was then fully organized, and at oneof its meetings he obtained permission to appear with hismodel fire-engine and to explain its operation; and, asthe minutes read, Mr. Savery entertained the Society withshowing his engine to raise water by the force of fire. Hewas thanked for showing the experiment, which succeeded, according to expectation, and was approved of. He pre-sented to the Society a drawing and specifications of hismachine, and The Transactions contain a copperplateengraving and the description of his model. It consisted ofa furnace, A, heating a boiler, B, w;hich was connected by > Philosophical Transactions, No. 282. Welds Royal Society, vol.i, p. 35V. Lowthorps Abridgment, vol. i. 34 THE STEAM-ENGINE AS A SIMPLE MACHINE.. pipes, C G, with two copper receivers, Z> B. There wereled from the bottom of these receivers branch pipes, FF, which turned upward, and were united to form a rising main, or forcing-pipe, G.From the top of each receiverwas led a pipe, which was turneddownward, and these pipes unitedto form a suction-pipe, whichwas led down to the bottom ofthe well or reservoir from whichthe water was to be drawn. Themaximum lift allowable wasstated at 24 feet. The engine was worked asfollows : Steam is raised in theboiler, B, and a cock, G, beingopened, a receiver, J), is filledwith steam. Closing the cock, C, the steam condensing in thereceiver, a vacuum is created, and the pressure of the at-mosphere forces the water up, through the supply-pipe, from the well into the receiver. Opening the cock, G, again, the check-valve in the suction-pipe at F closes, the steamdrives the water out through the forcing-pipe, G, the clack-valve, F, on that pipe opening be

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