The Man and the /'im/M 



when it hits the earth, no matter what the height 

 is from which it falls. This was a wonderful 

 covery, for it enabled man to do many things which 

 how to accomplish bef 



For thousands of years before Newton's day 

 men had seen things fall to the ground and they 

 had made use of that knowledge, but the use had 

 been very much limited by the fact that they did 

 not know tc/iv things fell. It was not until Newton 



ked out the laws of gravitation that man was 

 iblc to utilize properly the weight of things. So, 

 finding out tr/rv things happen is often a much 

 longer job than observing that they do happen. 



> the next step, though, in the progress of 

 getting things used to their full value. 



Neu-comen's Steam Engine. After we find out 

 why things happen, we arc in a position to set 

 our imaginations at work in order to make things 

 happen in a better v I'lu- first practical 



engine that was ever built with a steam cylinder 

 piston was made by a man named Newcomcn 

 in England about two hundred and fifty years ago. 

 That engine was worked by heating water in a 

 ler until the steam rose and pushed a piston up. 

 get the piston down again, the cylinder was 

 cooled by running cold water on the outside until 

 the steam inside condensed and the piston fell. 

 There was a pipe to carry the steam to the cylinder 

 and another pipe for the water. In the first en- 

 gines, which were used in the Cornish mines to 

 pump out the water, the valves on these pipes had 

 to be turned by hand. Boys were hired to turn on 



