l.EVEU WASniXG-MACIIIXE. 



Fig. 80. 



73 



Fio;. 82. 



Kendall's Cheese-press. 



part, the dotted lines indicating the position of the lever, 

 Avhich is inserted into a roller or axle, and, by turning, 

 drives the movable iron blocks asunder, and raises the 

 cheese against the broad screw-head above, as shown in 

 fisT. 82. In fiix. 81, the raised lever shows that the blocks 

 Fio-. 81. ^^'^ ^t first near togetlier, but are 

 crowded asunder as the lever is press- 

 ed downward. This cheese-press is 

 made of cast-iron, and has great 

 power; to try it, weights were in- 

 creased upon the lever, until the iron 

 frame broke with a force equal to six- 

 teen tons. 



The power exerted by a rolling- 

 mill, where bars of iron are flattened 

 in their passage between two strong 

 rollers, is precisely like that of tlie knee-joint. Tlje ojiljr 

 4 



