74 



Dick's cast-iron Cheese-press. 



Fig. 84. 



difference is, that the rollers, which may be considered as a 

 constant succession of levers coming into play as they re- 

 volve, are both fixed, and consequently the bar has to yield 

 between thcni (fig. 84). Tlie 

 greatest power is exerted just 

 as the bar receives tlic last 

 pressure from the rollers. The 

 most powerful and rapidly- 

 working sjtraw-cutters are those 

 which draw the strajW or hay 

 between two rollers, one of 

 which is furnished with knives 

 set around it parallel with its 

 axis, and cutting on the other, which is covered with un- 

 tanned ox-hide (fig. 85). 



Principle of the kvcc-joint in the 

 'rolling-milL 



