100 KESISTAKCE OF MATERIALS 



The constants v and a- in formula (130) are connected by the relation 



(132) 



V 

 (T = 



4 v 



where for fixed ends n = 1, for free ends n = 4, and for one end 

 fixed and the other free n= 1.78. 



The following table gives the special forms assumed by Johnson's 

 straight-line formula for various materials and methods of end 

 support : * 



* Trans. Amer. Soc. Civ. Eng., 1886, p. 530. 



