HYDRAULIC MACHINERY, FOR MINES 



867 



exigencies of the situation. The main of pipes may also run in an angular direction 

 or through shafts and levels. In counterbalancing pump-rods the weight-box bears 

 directly upon the line of pumping motion without occasioning any side strain. The 

 transfer of power to any reasonable distance whether at surface, or underground, may 

 also be effected at a loss in friction incomparably less than would arise from any other 

 mode of transmission, whilst the pipes for the retention of the water may be carried 

 into the remotest heading without causing any inconvenience. By one or other of the 

 arrangements winzes may be drained below the deepest level, and the ground readily 

 divided either for stopping or exploratory purposes. 



The hydraulic bar apparatus for changing vertical into oblique motion consists, as 



1201 



heretofore, of two ram-cases coupled together ; the motive ram alternating the pumping 

 ram. In fig. 1201, a is the motive ram, fixed in vertical shaft ; b, pumping ram, fixed in 

 an inclined shaft ; c, self-acting valve-arrangement for supplying water when necessary. 



Fig. 1202, p. 868, shows a method in operation at Wheal Phoenix, in Cornwall, for 

 transferring power from the main pump rod to a distant winze underground : a, main 

 rod ; b, supply pipe ; c, water main ; d, pumping rod fitted with side rods. 



The Hydraulic Circuit. In 1867, Jordan and Darlington designed an arrangement 

 which they designated an hydraulic circuit. This apparatus consists of two or more 

 force-pumps or plunger cases fitted with plungers. Motion is communicated to the 

 force-pumps or plungers by any suitable machine fixed in a convenient situation. To 

 each plunger-case is attached a small apparatus for drawing and discharging water 

 under adjustable conditions. A main or run of pipes, the hydraulic circuit, commences 



3x2 



