OF IRON BEAMS. 483 



preceding it, the bottom rib being further 

 increased, and being like as in them of equal 

 breadth through the whole length of 5 feet. 



Distance between supports as before. 



It broke very near the middle, by tension^ 

 with 21009 lbs., or 9 tons 8 cwt. nearly. 

 3p2 



