34 



BELL SYSTEM TECHNICAL JOURNAL 



(3) That the section modulus associated with 1.875" to 2.25" knots would 

 be ?:?5y#^' = 2.0334; and 







(4) That the section modulus values associated with 2|" and 3" knots 

 would be the same as shown in the Calculation 1 results (Table 1). 



KNOT DIAMETER 



Fig. 6 — Brace bolt hole sections. Section modulus of crossarm sections containing knots 

 of the sizes shown on the base line and located in damaging positions. 



The results of Calculation 6 (Table 3), and of the foregoing analyses, 

 together with the Calculation 1 results for 2|" and 3" knots, were plotted in 

 Fig. 6 for both minimum and nominal sections. 



t 



