STRESS LINES IN BEAMS. 93 



to determine the characteristics of the lines of maximum 

 internal stress. In the foregoing the underlying principles 

 have been sufficiently developed to clearly exemplify the 

 method of treatment. In the case of thick cross sections, 

 other than the rectangular, the matter is by no means so 

 simple. In a subsequent article it is expected to treat of cir- 

 cular, triangular and other cross sections. 



