HYDRAULIC MACHINERY, FOR MINES 



861 



by means of a chain with the cross-head, . The detailed arrangement of the shaft, 

 w, as well as the hydraulic winding-engine, is not shown, but this machine is also 

 dependent on the accumulator for its power. The pressure applied is 750 Ibe. per 

 square inch. No leakage of water is experienced at the joints, and in every respect 

 the performance of the apparatus is satisfactory. 



Fig. 1191 represents one of the hydraulic engines employed at the same mines for 

 charging an accumulator. The water for driving this engine is diverted from three 

 different valleys into a common water-race, and passed through the pressure-column b 

 into the engine, where, after having done its work, it is discharged into the day-level. 

 The following are some particulars connected with this engine: Available fall, 55 



1192 



feet ; diameter of pressure-column, 7 inches ; of piston-valves, 8 inches ; length of 

 stroke in main cylinder, 7 2 feet; diameter of cylinder, 18 inches; diameter of cylinder 



