















At = 9° F 

















b 

































220 

 210 









^ 



~~—- 



H(conve 



•gence)_ 









-—y^ 













190 

 180 





/ 



* 



























170 





/ 





























160 





/ 

































/ 





























140 

 130 



— 



/ 



' 



s*' 



^- """" 



y^-' 























120 



110 



/ 



: / 



/ 











«\^ 





















/ 



/ 





























90 

 80 



: 1 



/ 

 / / 





u*^ 



^ 



ence)_ _ 









T^g^ 



ne^l— 













70 

 60 





/ / 



/ y 































T f 





























40 





' 1/ 





























30 



- '/ 



y 





























20 



if i 



// / 

 / i / 





























10 



f 1 



/ \ / 





























0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 



k 

 FIGURE 18 PARAMETERS , AND h VERSUS k FOR STABILITY INDEX At = 8° TO 10° F 



37 



