AGE OF MACHINERY 



493 



Third Class Lever. The sugar tongs represent an example of 

 the third class lever. The fulcrum is at one end, the lump of sugar 

 (weight) is at the other end, and the force is applied near the center. 



of tKe Third Class 



, Jf A .: t 



Fulcrum 



WA. 



Fulcrum 



Lever of 3 * ? 



Press 



r ulcr 



Fire Torv^s 



Fulcrum N^Wei6Kt 



Spoors 



Laws of a Lever. Levers are useful machines since they assist 

 men to accomplish work which otherwise might require a great deal 

 more force expended at one time to accomplish the work to be done. 



FIG. 373. 



The distance from the fulcrum to the power multiplied by the power 

 is equal to the distance from the fulcrum to the weight multiplied 

 by the weight. In this statement the weight of the lever is neglected, 

 as is usually the case, since it amounts to very little, 



