^8 THE STRENGTH 



XXV. EXPERIMENT. 



Distance between supports 7 feet, depth of 

 beam 6.0 inches. 



Dimensions of section in inches. 



Area of top rib = 2.2 x .33 = .73 

 „ of bottom rib =5.95 X .75 = 4.46 



Thickness of 

 vertical part 



Area of Section == 7.08 inches, 



'1= 



.355 



Weight of castings 1 cwt. qrs. 15^ lbs.= 



Weliihts 

 iu lbs. 



7257 



7947 



8637 



9327 



10017 



10707 



11397 

 12087 

 13543 

 14271 

 14999 

 15129 



127 J lbs. 



Deflections in parts 

 of an inch. 



Returned to, 

 (weights removed.) 



•27 



.32 

 .33 

 .34 

 .36 

 •38 

 42 



.45 doubtful. 



.49 perceptible set. 



53 .04 



.56 .06 



.68 



It broke by tension in the middle with this 

 last weight, 15129 lbs. = 6 tons 15 cwt. 9 lbs., 

 after standing a minute. 



