CH. XXVIII. 



NEWCOMEN S ENGINE. 



245 



in 1690 and 1698, a Frenchman named Papin and an 

 Englishman, Captain Savery, tried to make steam-engines 

 to raise water out of mines. But the only one of all these 

 engines which we need describe here was that which fell 



FIG. 43- 

 Newcomen Engine (Black). 



a, Stopcock between boiler and cylinder, b, Stopcock between cold-water tank and 

 cylinder, c, Valve closing air-vent, d, Valve closing the outlet for condensed 

 steam, e, Weight which drags down the beam. /, p, Piston which is pressed 

 down by the atmosphere when the cylinder is empty. 1 



into the hands of Watt, and which was made by a man 

 named Newcomen in 1705. A section of Newcomen's 

 engine is given in Fig. 43. Its working depended on the 

 pressure of the atmosphere (explained p. 120) on the piston 



1 The boiler and cold-water tank both in this Figure and in Fig. 45 

 are drawn much too small in proportion, in order to bring them into 

 the Figure. 



