OF IRON BBAMS. 501 



W«igbu. Deflcctioni. 



14345 .44 



15913 .47 



17481 .50 



19049 .58 



With tlus last weight the beam was conceived 

 to be very near fracture; the weights were 

 therefore removed, and the casting was found 

 to have taken a set of tzt of an inch. 



5Q. To ascertain whether the beam was as 

 strong toward the ends as in the middle to bear 

 a uniform load, weights were now gradually 

 laid upon the beam, at a point half way between 

 the middle and the end, in the same manner 

 as in the note after experiment 24. It bore 

 20225 lbs. for about half-a-minute and then 

 broke near the end, at a place in the under 

 side of the bottom rib, where it was rather 

 unsound. The inference from this experiment, 

 though imperfect, is that the beam would 

 bear a somewhat greater weight near the ends 

 than in the middle. '^ 



57. From these experiments it appears that 

 the ultimate strength, in sections like the 

 preceding, is, caeteris paribus, nearly as the 

 depth ; but somewhat lower than in that ratio. 



