HYDROSTATIC PRESS. 



185 



to distant markets. The following figure {Fig: 156) 

 exhibits the different parts of this powerful machine. 



Fig. 156. 



Ifi/drost jtir Press. 



A is a cistern to supply water, which is raised by work- 

 ing the handle, B, of the forcing-pump; the water 

 passes through the valve, C, opening upward, and 

 through the spring valve, D, opening toward the large 

 cylinder, E. Being thus driven into the space, E, it 

 raises the piston, F, and exerts a prodigious pressure 

 upon the mass of hay or cotton, G. The piston is low- 

 ered by turning the screw, H, which allows the water 

 to pass back into the cistern at I. In the figure the 

 hay is sho\^ai as visible to the sight, in order to repre- 

 sent the whole more plainly; but in practice it is 



