PLATE XXIII 



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DIAGRAM SHOWING POSITION OF CENTRE OF GRAVITY. 



Since a coach is symmetrical, the centre of gravity is at some point in a plane 

 passing vertically through the centre of the body. When the coach is tipped on 

 the wheels of one side until it balances and would fall either way. the centre of 

 gravity is over the point of support, and must therefore be in a plane which passes 

 vertically through the points where the wheels rest on the ground. 



In the case of an empty coach experimented with, the balance was found when 

 the wheels on the higher side were raised to the position shown by the dotted 

 lines 



With a load of 1700 pounds added on the top, the position of balance is shown 

 by the lines . . . . . 



