468 TRANSFERRING AND TRANSFORMING ENERGY 



tached to the beam 

 and the part of the 

 cord held by the 

 hand. The hand will 

 need to move twice 

 as far as the weight 

 is lifted. 



A number of pul- 

 leys may be arranged 

 as in Figure 143 so 

 that the movable pul- 

 ley with the weight 

 attached is supported 

 by several cords. In 

 this case each sec- 

 tion of the cord sup- 

 porting the movable 

 pulley sustains its 

 proportion of the 

 weight, and the power 

 is as many times less 

 than the weight as 

 there are cords sup- 

 porting the movable 

 pulley. But the gain 

 in power means a loss in distance. The power will have to 

 travel as many times farther than the weight as there are 

 cords supporting the movable pulley. An arrangement like 

 this enables a small power slowly to lift a large weight. 



The Inclined Plane. When the ancient Egyptians built 

 the great pyramids, it was necessary for them to raise huge 



INCLINED RAILWAY, SWITZERLAND 

 A gigantic inclined plane. 



