on a new Friction Sledge for stopping Railway Trains. 



229 



Second Series. 



Third Series. 



Hence 



or. 



Referring to p. 222, we find 



A cos I = ■/! 2^ {k cos /— sin /) j. 



{A cos iy 



^9 



■\- smi =Jc cos /; 



i =-0154^- + •0146. 

 2 h2 



