THE KNEE-JOINT POWER. 



163 



which is furnished with knives set around it parallel 

 with its axis, and cutting on the other, which is cover- 

 ed with untanned ox-hide {Fig. 144). The only de- 



Fig 146. 



feet in this machine is its inability to cut shorter than 

 one inch in length, which is not sufficient for corn- 

 stalks and other coarse fodder. 



Dick's Cheese-press {Fig: 145, 

 on the following page) operates on 

 a similar principle. Figure 146 

 shows the structure of its working 

 part, the dotted lines indicating the 

 position of the lever, which is in- 

 serted 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 Fig. 145. In Fig. 146, the 

 raised lever shows that the blocks are at first near to- 

 gether, but are crowded asunder as the lever is press- 

 ed downward. This cheese-press is made of cast-iron, 



