244 



Low-pressure Steam-engine. 



passes through what is called Si four-way-cock, a, first 

 into the lower, then into the upper end of the cylinder, 

 C, as the piston, P, moves up and down ; this is regu- 

 lated by the levers, y y. The piston-rod, E, is attach- 

 ed to the working-heam, B F, turning on the centre, A. 

 The rod, F R, turns the fly-wheel, H H, and drives 

 the mill, steam-hoat, or machinery to be put in motion. 

 The condenser, j, shown directly under the cylinder, 

 remains to be described. It is immersed in a cistern 

 of cold water, and is connected by pipes to the upper 

 and lower end of the cylinder. Through these pipes 

 the steam passes out of the cyhnder, first from one end 

 and then from the other, and is condensed into water 

 by a jet of cold water thrown into it by the injection- 

 cock. When condensed, it is pumped out by the pump, 

 0, into the well or reservoir, W, and then again into 



