600 THE STRENGTH 



Weights. Deflection*. 



15913 .40 



17481 ----- .45 



18265 ----- .50 



19049 .52 



19833 ----- .55 



20617 60 



21401 .65 a 



22185 = 9 tons 18 cwt. with this 

 weight it broke by tension exactly in the middle. 



XXVII. EXPERIMENT. 



Distance between supports 7 feet, depth of 



beam 6.98 inches. 



Beam from the same mode] as the last. 



Dimensions of section in middle, (see fig. last experiment.) 



Area of top rib = 2.25 x .32 =z .72 inches. 

 „ of bottom rib = 5.95 x .73 = 4.343 „ 

 Thickness of vertical part = .37 

 Area of section = 7.40 inches. 

 Weight of beam = 1 cwt. 1 qr. 1 lb. = 141 lbs. 

 u 

 This beam received a shake in the commence- 

 ment of the experiment, which gave it a sensible 

 set, but did it no other injury. 



Weights Deflections in parts 



in lbs. of an inch. 



9327 .25 



11397 . - - - - .36 



