616 THE STRENGTH 



Weights. Deflectioiu. Retorned to. 



7253 - - - - .37 - - - - .05 

 7598 - - - - .38 

 7943 - - - - .40 



8288 - - - - .42 

 8540 - - - - .44 - - - - .06 

 8792 lbs. = 3 tons ISi cwt. With this it 

 broke after bearing the weight half-a-minute. 



The form of fracture was nearly that o( bnr 

 in figure 2 to experiment 4. The distance of 

 n from the top was = 2.3 inches, and of r — 

 .8 inches. 



Hence 2921= 3009 lbs. per square inch of 

 section. 



The beam in experiment 4, supposed from 

 the same iron, and the only one cast on its 

 side like this, did but bear 2584 per inch. 

 Taking the mean of the two we have ^^^^ ^ ^^^^ 

 = 2796 lbs. per inch. 



XXXV. EXPERIMENT. 



A beam of the common form, and from the 

 same model and iron, cast erect, as usual. 

 Distance between supports, 4 feet 6 inches. 

 Depth of beam in its middle, 5f inches. 

 Weight of beam, 37 lbs. 



