RELATIVE BEXDIXG STRENGTH OF CROSSARMS 



Table 1. — Section Modulus of Roofed Sections between Pinholes 



Table 2. — Section Modulus of Roofed Pinhole Sections 



* Section Sizes: 



Minimum = 3^" x 4^" 



End. Min. = 3^" x 4" (viz. minimum at end of arm) 



Nominal = 3J" x 4^" 



convenience, reference is made to the calculations by number in the pages 

 that follow. These results are shown in Tables 1, 2. .S anH 4 and a brief 

 discussion of the scope and use made of them follows. 



