A history of the growth of the steam-engine . rels, 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 PERIOD
A history of the growth of the steam-engine . rels, 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 PERIOD OF SPECULATION. 7 pation of the vessels used many centuries later by severalso-called inventors of the steam-engine. Proposition 45 describes the familiar experiment of aball supported aloft by a jet of fluid. In this examplesteam is generated in a close cauldron, and issues from apipe inserted in the top, the ball dancing on the issuing jet. No. 47 is a device subsequently reproduced—^perhapsreinvented by the second Marquis of Fia. 2.—Steam Fountain, e. o. 200. A strong, close vessel, A B C D, forms a pedestal, onwhich are mounted a spherical vessel, JS F, and a pipe, UK, is led from the bottom of the larger vesselinto the upper part of the sphere, and another pipe from thelower part of the latter, in the form of a syphon, over tothe basin, M. A drain-pipe, iV 0, leads from the basin tothe reservoir, A D. The whole contrivance is called Afountain which is made to flow by the action of the sunsrays. It is operated thus : The vessel, EF, being filled nearlyto the top with water, or other liquid, and exposed to theaction of the suns rays, the air above the water expands,and drives the liquid over, through the syphon, G, into thebasin, M, and it will fall into the pedestal, A JB 0 D. Hero goes on to state that, on the removal of the sunsrays, the air in the sphere will contract, and that the water 8 THE STEAM-ENGINE AS A SIMPLE MACHINE. ?will be returned t
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
