OF IRON BEAMS. 475 



Weight! Deflections in Retnrned to. 



In lb*. pvts of an inch. Weights removed. 



•"^ ^'9327 • 



10017 



12087 -26 



12777 -29 



„ repeated .30 .05 



14345 .33 07 



.05 in a mionte. 



15913 .35 .05 



16607 -36 



18265 .43 



Breaking weight 19441 lbs. = 173i cwt. 



This beam broke very nearly in the middle, by 

 tension, as before. 



Hence strength per square inch of section = 

 •-^ = 3317 lbs. 



43'. The preceding beams were intended to be 

 equally strong, in every part, to sustain a load 

 laid imiformly over them ; and to see if that was 

 the case in this beam, I made the following 

 experiment. — The larger arm of the beam was 

 placed on two supports, 2 feet 3 inches apart, 

 and had 26497 lbs. laid upon its middle, without 

 breaking there : it failed at its fractured end, or 

 it would have been tried further. 

 3 o 2 



