14% THE STRENaTH 



throughout, with its parts as slender as could 

 well be run to preserve it even and sound. 

 Durinj^ the experiment, one end of the casting 

 was fixed in a wall, and weights to bend it 

 huns: at the other. 



to^E 



6 



ABC represents an elevation of the castings 

 then, and D C E a cross section of all of 

 them. The end A was wedged fast into the 

 wall, but so as to be easily removed, in order 

 that the casting might be turned the other side 

 upward; as the intention was alternately to 

 compress and extend the vertical rib of D C E 

 at C. In the following description therefore, jl 

 must be understood as indicative that the casting 

 was turned that way upward, and hence the leg 

 at C extended, and t that it was turned 

 the opposite way, and the leg compressed. 



Expt. 1st. In this experiment the length 

 AB (figure above) was about 3 feet 6 inches, 

 and in the annefxed figure ABCDEFA, which 

 represents a cross section of all the castings, 

 used for this purpose, (and is merely an enlarged 

 figure DCE above, for the purpose of specifying 

 more particularly the dimensions,) AB z= 2.4 



