216 MI; i; v. sorrrnvKi.!. ox TIIH CKXKKAL THEORY OF ELASTIC STABILITY. 



_ A)],, 



4 / J 



2 m 2 



, . (74) 



(75) 



A-B A 1 . m A-B A 



2 

 A-B A 



(70) 



