























5° 

























































rlO° j- 













































































15° 



























•20° 



.25" 



30° 



35° 



40° 

 45° 

 55° 













































/ 



// 



y 

















>',S 



y 



^ 



i 



\ 



















*& 







/, 



/ 



70° 

















l*&£* 











9C 



)° 







s 



s' 







^b?' 







^ 













_^~ 















^^ 



<* 













^^ ^>* 













- + ^ ^* 













































•^Z-ZZ^Z 











































































































































O.I 





























o.oi o.o e 



0.05 0.10 0.20 



f 



o.so 



1.0 



Figure 3f - Variation of T/Ry with tf and f . 



