en. xxvnr. 



WATT'S ENGINE. 



249 



Let us now begin with the machine as we see it in the 

 figure. In this position of the* beam the cocks a and c are 

 open ; therefore, the steam below the piston will rush out 

 at c into the condenser, there to be turned into drops of 



FIG. 45. 



A, B, Cold water tanks, c, Outlet for cold water. D, E, Pumps for drawing off" hot 

 water and sending it along s, s, back to the boiler, r, Tight - fitting piston. 

 a, d, Cocks for letting steam into the cylinder. l>, c, Cocks for letting steam out 

 of the cylinder, e, c, Pipe which carries steam from boiler to cylinder, o, a, Pipe 

 which carries steam from cylinder to condenser, i, 2, Rods connecting the cocks 

 with the lever-beam. 



water, while the steam from the boiler, entering at a, will 

 force the piston down. But now, the piston having pulled 

 down the beam, a and c will be closed and the other two 

 cocks, b and d, will be opened. So the steam above the 

 piston will rush out at b into the condenser, while the steam 



