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Prof. L. N. G. Filon : Investigation of Stresses 



quadrant P. P' are outside CQ ; but i£ </< P, P' are between 

 and Q outside DCE and inside CQ outside DCE. 



Fig-. 5. 



The part of the plane which corresponds to the field of 

 view is that below the horizontal through C ; thus if g>0, 

 //>0 both P, P' are in the field inside DOE, but only one of 

 them outside this angle. If q>0, b f <0, fig. 4 shows that 

 no part of the curve is in the field within the angle DOE, 



Fij 



and one point P only outside DOE. Finally, if g-<0, b' >0, 

 one point P is in the field within DOE, and both P and P' 





