SOLDERLESS WRAPPED CONNECTIONS 



PART II 



589 



For example, the isoclinic lines for the square plate of Fig. 3 are shown 

 by Fig. 24. All the isoclinic lines converge on the positions of the *'eyes" 

 which is a characteristic to be expected of an isotropic point {Ti — T^) — 

 0. For the Une through the center of the "eyes", which we designate as 

 the X direction, the isoclinic line Hes along the X axis and hence there 

 is no shearing stress along this axis and Ti — T2 = T'l — T2 . At either 

 edge the stress in the X direction is zero and hence at this point the 

 stress T2 (which is a compression) is obtained by counting the number 

 of lines from the isotropic point to the edge (in this case 20) so that 

 the stress at the edge is 



^ 20 X 88 



1850 pounds/square inch (33) 



To determine the shearing stresses at any point, one needs to fit the 

 isoclinic lines over the isochromatic lines. For example, for any point 

 along the isoclinic line marked 15, the direction of the principal axis is 



0" 



Fig. 24 — Isoclinic lines for a square terminal whose isochromatic lines are 

 shown by Fig. 3. 



