160 



MECHANICS. 



Washing-machine {Fig. 140), which is worked by 

 the alternating motion of the handle, A, pressing a 

 swinging-board, perforated with holes, with great force 



Fig. 140. 



Lever Washing-machine. 



against the clothes next to one side of the water- 

 box. Like the printing-press, this machine exerts the 

 greatest power just as the motion of the lever is 

 completed, and at the time it is most needed. The 

 same principle is exhibited in KendalVs Cheese-press 

 [Fig. 141), where the lever and the wheel-and-axle 

 are corribined with the two knee-joints, one on each 

 side of the press, drawing down a cross-beam upon the 

 cheese with a greatly multiplied power. Fmer'ifs 

 Hay-press., for compressing hay into bales for distant 

 conveyance, is another example {Fig. 142). The hay 

 is thrown into a space in a strong box by opening the 

 top doors, and when trodden down, the doors are closed 

 and secured by buttoning down the cross-bars. Horse- 



