626 THE STRENGTH 



Taking then the breaking weight in cwts. 

 we have : — 



In Experiment 12, 



c = 10.6366 X ^ = 10.6366 x i|^' = 644.6 

 In Experiment 14, bottom rib too small. 

 In „ 15, 



c = 10.5366 X :^= 10.5 &c. x ^^ = 545.4 

 In Experiment 16, diflferent iron. 

 In „ 18, 



c = 10.5366 X -=z 10.5&C. x ^^ = 512.3 



The mean from all these values of c, to pro- 

 duce cwts. in beams cast erect, is = 535.9. 



The preceding beams were all cast erect; those 

 which follow were cast on their side, (see defi- 



