CHAPTEE XIX. 



Other Types of Pumping Machinery Water Hoisting The Hydraulic Ram Hydraulic Air 

 Compressor The Jet Pump The Injector Hydrant The Air Lift Pump Reversed Air 

 Lift Pump as Air Compressor Humphrey's Gas Pump. 



ART. 185. WATER HOISTING FROM MiNES. 1 



THE method of direct hoisting of water in large tanks has come very 

 rapidly into favour of recent years in the anthracite region of Pennsylvania 

 for mine drainage purposes. 



The system has the advantages that in general, with the exception of 



the tanks, and the guides used for 

 keeping these vertical while hoist- 

 ing, no new machinery is needed, 

 the only cost being that due to 

 extra wear and tear of the hoisting 

 engines and to the steam used 

 while hoisting. Further, the whole 

 of the operating machinery is on 

 the surface and free from the 

 danger of being flooded, while no 

 underground steam pipes, with the 

 accompanying losses by condensa- 

 tion and the danger of damage by 

 a slip of the roof, are necessary. 



Cylindrical hoisting tanks are 

 now general, these having a couple 

 of butterfly valves in the bottom 

 placed at an angle of 45 (Fig. 329). 



The tanks may discharge at the top of the shaft either by overturning 

 or by automatic opening of the bottom valves. The former method is 

 preferable as rendering more rapid manipulation possible. With tanks of 



1 For a descriptive article on this method of mine drainage, see a paper by R. V. Norris, 

 before the American Inst. of Mining Engineers, 1903, or an abstract of this paper in 

 "Cassier's Magazine," for May, 1904. 



FIG. 329. Method of End Dumping in direct 

 Water-hoisting Plant. 



