864 



HYDRAULIC MACHINERY, FOR MINES 



tho stops referred to, and passes through a tubular valve-rod ; the valve is D-shapod ; 

 the pressure-port and exhaust-ports arc shown ; together with tho roliof-valve. Tho 



1197 



1 198 



engine under its working pressure of about 

 500 Ibs. per inch, runs with great regu- 

 larity. 



Fig. 1195 exhibits a rotary engine ap- 

 plied to winding, pumping, and ventilat- 

 ing purposes. In its general arrangement 

 it includes an air-vessel, four ram-cases, 

 and two winding-drums, a wheel fitted 

 with crank-pin for pumping, and a fan. 

 Fig. 1195, plan] Jig. 1196, elevation on 

 line a, b, of plan. Fig. 1 197, cross-eleva- 

 tion of engine and air-vessel. A, A', outlet- 

 pipes from ram-cases; B, inlet-valve ; D, 

 air-vessel ; E, inlet-pipe ; F, fan driving- 

 wheel, fitted on main shaft ; o, H, outlet- 

 pipes, connecting valve-boxes with ram- 

 cases ; K, K', clutch-box ; M, spur-pinion; 

 N, N', spur-wheel, with pin for attaching 

 pump-rod ; p, o', excentric valve-rods ; Q, 

 shaft for driving winding-drum ; E, spur- 

 pinion ; s, drum ; i, spur-wheel on drum- 

 shaft ; a, c, ram-cases in section, a, c, in 

 plan ; b, rams ; d, d' t fork crank-lovers ; 

 c, slide-valves ; /, pipes from cylinder ; g, 

 passage to cylinders ; m, m', excentrics ; 

 p, lever for shifting the clutch ; w, brake- 

 strap ; z, brake-lever. 



Hydraulic Bar. In its simplest form 

 the hydraulic bar consists of a main of 

 pipes charged with water, with a plunger 

 or piston at each end; tho movement of 

 one plunger equally affecting the move- 

 ment of the other through the medium of 

 tho water stored within the main. Early 

 in 1867 West and Darlington commenced 

 to apply the hydraulic bar to the working 

 of pumps and balancing of pump-rods. 

 Fig. 1198 represents the counterbalanc- 

 ing apparatus in connection with a mining 

 pump-rod when working in a vertical 

 direction, a, plunger attached to main- 

 rod; b, pipe connecting the second r.i in- 

 case ; c, plunger, with weight- box /; g, 

 guides for weight-box ; A, pipe com- 

 municating with cistern, for supplying 

 such water as may be necessary to 





up leakage ; ,;', small supply-plunger, to bo attached to the apparatus when tho pipe, 

 h, cannot be advantageously introduced. 



