POLE STEAM-ENGINE. 



81 



tubes, 45 feet long each, 3 feet diameter, an inch thick, of 

 wrought iron, side by side, nearly horizontal, only 15 inches 

 higher at the steam end of the tubes, to allow the free passage 

 of steam to the steam-pipe. There are two 4-inch valves, one the 

 steam- valve, the other the discharging valve. I have made the 

 plunger- case and steam-vessel of wrought iron f of an inch thick. 

 The steam-vessel is 48 inches in diameter. The plunger stands 

 on beams over the shaft, with the top of it at the level of the 

 surface, with a short T-piece above the plunger -pole, and a side 



POLE-ENGINE. 



rod on each side, that comes up between the two plunger-beams 

 in the shaft ; this does away with the use of an engine-beam, 

 and the plungers do away with the use of a balance-beam. 

 VOL. II. G 



