Une histoire de la croissance de la machine à vapeur . description ici. Un moteur à air chaud, cependant, qui est l'objet de sa proposition, est de37th le vrai intérêt. Esquisses et héros décrit une méthode d'ouverture-tem ple-portes par l'action de la division fii-e sur un autel, qui est aningenious, et contient tous les éléments de l'appareil du Marquis de Worcester, qui est generallyconsidered la première véritable machine à vapeur, avec le seul défaut qui andvital l'expansion de l'air est liquide au lieu de la vapeur.Le croquis, de traduction, l'expositions Greenwoods de-vice bien nettement. Sous le temple-portes, dans

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A history of the growth of the steam-engine . escription here. A hot-air engine, however, which is the subject of his37th proposition, is of real interest. Hero sketches and describes a method of opening tem-ple-doors by the action of fii-e on an altar, which is aningenious device, and contains all the elements of themachine of the Marquis of Worcester, which is generallyconsidered the first real steam-engine, with the single andvital defect that the expanding fluid is air instead of steam.The sketch, from Greenwoods translation, exhibits the de-vice very plainly. Beneath the temple-doors, in the spaceAB CD, is placed a spherical vessel, H, containing water.A pipe, F G, connects the upper part of this sphere withthe hollow and air-tight shell of the altar above, BE.Another pipe, KL M, leads from the bottom of the ves- 6 THE STEAM-ENGINE AS A SIMPLE MACHINE. sel, H, over, in syphon-sliape, to the bottom of a suspendedbucket, NX. The suspending cord is carried over a pulleyand led around two vertical barrels, O P, turning on pivots. Fia. 1.—Opening Temple-Doors by Steam, E. o. 200. at their feet, and caiTying the doors above. Ropes led overa pulley, JR, sustain a counterbalance, TK On building a fire on the altar, the heated air within ex-pands, passes through the pipe, F G, and drives the watercontained in the vessel, H, through the syphon, KLM, into the bucket, NX. The weight of the bucket, whichthen descends, turns the barrels, OP, raises the counter-balance, and opens the doors of the temple. On extinguish-ing the fire, the air is condensed, the water returns throughthe syphon from the bucket to the sphere, the counterbal-ance falls, and the doors are closed. Another contrivance is next described, in which thebucket is replaced by an air-tight bag, which, expanding asthe heated air enters it, contracts vertically and actuatesthe mechanism, which in other respects is similar to thatjust described. In these devices the spherical vessel is a perfect antici- THE PERI

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