. The American artist's manual; . dity; and the water does not begin toyield to its pressure, until its surface beso not, as not to condense any more now descends, but as by that, a newpart of the side of the receiver is exposedto the steam, more is condensed, so thata condensation of the steam is going onall the while the water is too, must necessarily be repeatedevery stroke, as the receiver is cooledevery time it is filled with water. Mr. Savary succeeded in raising waterto small heights, and erected several en-gines in different parts of England; buthe could make n
. The American artist's manual; . dity; and the water does not begin toyield to its pressure, until its surface beso not, as not to condense any more now descends, but as by that, a newpart of the side of the receiver is exposedto the steam, more is condensed, so thata condensation of the steam is going onall the while the water is too, must necessarily be repeatedevery stroke, as the receiver is cooledevery time it is filled with water. Mr. Savary succeeded in raising waterto small heights, and erected several en-gines in different parts of England; buthe could make nothing of deep attempts have been made to correctthese defects, but hitherto without muchsuccess. In the beginning of the eighteenth cen-tury, Newcomen, an ironmonger or smith,and Cauly, a glazier at Dartmouth, in De-vonshire, in England, first conceived theproject of applying a piston with a lever,and other machinery. They were content-ed to share the profits of the invention with Savamxt? Stjeam XACixas. Flate se. STE STE Savary, who procured a patent for it in1705, in which they were all threejoined. Fig. 2, exhibits a section of Newco-mens engine: a is the boiler, built inbrick-work. In the top of the boiler is asteam-pipe, c, communicating1 with the cy-linder by which is of metal, and is boredvery truly. The lower aperture of thispipe is shut by the plule n> which isground very flat, so as to apply very ac-curately to the whole circumference ofthe orifice. This plate is called the re-gulator or steam-cock, and it turns hori-zontally round an axis, o, which passesthrough the top of the boiler, and is fittedby grinding to the socket, so as to besteam-tight. It is opened and shut by ahandle fixed to its axis. In the cylinder b, is a solid piston p,well fitted into it, and made air-tight by apacking of leather or soft rope, well filledwith tallow, and for greater security, asmall quantity of water is kept above thepiston. _ The piston-rod d i
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