REACTIONS OF DRAW BRIDGES 



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FIG. 10. 



librium polygon passing through m-n-o-p. Now, with a load repre- 

 sented by the triangle 1-3-4, construct a force polygon (not shown) 

 and draw an equilibrium polygon passing through m-o-p. The method 

 of drawing an equilibrium polygon through three points is explained 

 in Chapter V, Fig. 20. 



CoO 



m>> 



(O 



Then in (c) Fig. n, 



FIG. ii. 



and 



