47!i THE STRENGTH 



Distance between supports and depth as before. 



Dimensions of section in inches. 



Area of top rib = 2.35 x ,29 = .68 _ JL^ 

 Area of bottom rib = 6.43 x .537= 2.916 ^ f'2,9 

 Thickness of vertical part = .35. 

 Area of section = 5.292 inches. - i-^b.r. 



WelsbU Deflections in parts 



in lbs. of «D inch. 



6218 .12 



7598 - .15 



8288 .18 .^^ 



9309 .20 



10330 - .22 



11338 - V .25 



12346 -^:==:^fE.VC:S*=:^£friTlOl3fe/;slA 



13354 . ^ . - ,29 3^^ 



14371 -31 



15393 - .33 



16401 - .53 



Breaking weight 16905 lbs. = 150 cwt. 105 lbs. 

 It broke by tension. 



Hence strength per square inch of section 



16905 

 6.292 



= 3194 lbs. 



XVI. EXPERIMENT. 



Beam from the same model, but with further 

 increased bottom rib. 



