xviii NOTATION. 



d = unit deformation in line of stress for tension or compression 

 (inches per inch). 



^ 8 unit deformation due to shear (inches per inch) = angle 

 produced, in circular measure. 



dL = total deformation in length L (inches) . 



6 = angle shown in the Fig. and usually measured from the ver- 

 tical. Also see Eq. (49), page 173. 



S = "the sum of " = summation of all terms similar to that fol- 



lowing this sign. 

 j =sign of integration and denotes the summation of all the 



infinitesimal values of the following variable. 

 = angle shown in the Fig. 

 oo = infinity. 



