518 THE STRENGTH 



Form of fracture nearly same as in figure to 

 experiment 4. 

 Distance of point n from top = 2.00 inches. 

 „ r „ = .80 „ 



From this beam we have ^^^ = 3188 lbs. per 



square inch of section. 



62. In the preceding experiments, there ought, 

 according to supposition (art. 59), to have been 

 an equahty of strength between the beams in 

 experiments 28 and 30, and those in 31 and 

 33 ; there was however a difference, in both 

 cases, of about f th of what the larger beam 

 bore, that beam being the stronger. , 



Experiment 29 was defective, but experiment 

 32, where the object was the same, and which 

 ought to have given a strength equal to half 

 that in experiment 31 or 33, indicated, as it 

 ought, a breaking weight, whose double was 

 somewhere between what was given by them. 

 The discrepances, in the strength of the beams 

 in the four experiments first named above, are 

 considerable; but not so great as to render it 

 necessary to seek for any other law. They 

 may moreover, perhaps, be accounted for by 

 the ways in which the fractures took place; 

 three out of the four beams having broke by 



