452 Steam Machine by Papin, [Book IV.

1707.” It is inserted he re out of chronological Order, to keep this noticeof his labors unbroken.

No. 192. Papin. A. D. 1707.

A copper boiler, A, is set in brick Work and furnished witb a safety-valve, B, whose lever is loaded with the weigbt C. The steam pipe andcock D connect the boiler witb the receiving cylinder F. A hollow floator piston is made to move easily in F, to prevent the steam from comingin contact with the water. A cavity is made in this float for the receptionof an iron heater, Z, designed to keep up the temperature of the steamwhen the latter is admitted into F. The heater is admitted through theopening on the top of F, which is closed by the valve G. X, a funnelthrough which the water to be raised is introduced, which is kept from re-turning by closing the cock or valve H. The lower part of F is connectedwith the rising main K by a curved and tapered tube. The pipe K ter-minates in a reservoir or air chamber, whence the water is discharged bythe pipe O upon an overshot wheel, or conveyed to the place where it maybe required. If the receiver be charged from below, a suction pipe (im-perfectly represented by the pipe I) was continued to it from the underside of the curved pipe. The steam flowing through the pipe D pressesdown the piston, and the water beneath it is forced up the pipe K, (thevalve at the lower part of K. preventing its return.) When the piston hasreached the bottom of F, the cock D is shut and the one marked E isopened. H is then opened, and the water rushes in and drives up thepiston as before, when the Operation is repeated. Water was raised byone of these machines to an elevation of 70 feet, whence it descended andformed a jet d’eau in the court of the Hessian Academy of Arts.

Belidor inserted a figure and description of this machine in the secondvolume of his Architecture Hydraulique, p. 328.