OF IRON BEAMS. 4f3 



Distance between supports and depth as before. 

 Area of bottom rib = 6.8 x .502 = 3.413 ins. -- ^ 

 Weight of beam = 64i lbs. ^^'^'f ^•**^"* 



WeigbU Deflections in parts 



Vcl Ibt. uf an iucli. 



6218 .16 



7598 18 



8288 - - .19 



9309 - - -I- - -Vrv '21 



10331 - r .-, ,- - " A- - - - - -22 



H339-*i^i^^:^^.^^-''^^^.^-.24 



12341 -.- - -.T - -^'* - - - - -26 



1 . 13351 - - - -/^^ .28 



Breaking weight = 1 4336 lbs. nearly, and 

 14336 lbs. = 128 cwt. 



This brokie by tension and ought to have 

 borne considerably more than the last beam; 

 but its iron must have been of a less tenacious 

 kind than the others; as is evident by com- 

 paring their deflections, this beam having bent 

 little more than half what the preceding one 

 did before it broke. The same may be said of 

 the common beam following. 



XVII. EXPERIMENT. 



Beam of the common form from the same 

 model as the preceding ones, (see fig. to expt. 4). 



3 o 



