I LINK-LOAD STRESSES 



Theorem I. 



The sum of the ordinaie-load products between two di- 

 verging lines equals the difference between the slopes of 

 the two lines multiplied by the sum of the moments of 

 th<> loads about the intersection of these lines. 



In symbols, this is stated as 



Z = C a M a (5) 



Theorem II. 



The rate at which the sum of the ordinate-load prod 

 ucts between the two diverging lines increases as the load- 

 ing moves away from the intersection of these lines equals 

 the difference between the slopes of the two lines multiplied 

 by the sum of the loads. 



In symbols, this is stated as 



dZ_ d(C.M.) dM, 



&- CaW '- ^r c ir (5a) 



The proofs of these theorems follow in the next article. 



