338 Messrs. Nagaoka and Honda on Change of Volume and 

 we obtain the following expression for these two constants : — 



and 



where 



k' = 



k": 



p(l + 26)-g 



2(1 + 30) ' 



Zq-p 



2(1 + 3(9)' 



4K(l + 3fl) ^, , 

 = ^J2 a + 47rAr 4- ok, 



H 



ff= ^ X+^-(l + 0)+^. 



These constants as calculated from the change of dimensions 

 of ovoids are graphically shown in fig. 3. 



Fig. 3. 



3*10' 



r'x 



5 













R: 



I0 3 







5; 



I0 3 



• 



















/V/ 



CKi 



'L 



r | 



SO 



7V> 



W 



r 



\ 



jr< 



£/ 





\ 



iff 



?z^, 



7AM 



S7 



C £L 

















K' 





3 





i 









\ 



K' 

















*K*H 







^ I 



1 







i 



\ 







1 



KhS 



\ 

















\ 









\ 







i 



i 



v . 



\ ' 



X | 







\\ 



\ 















V 







► 



'4" 



^v. 





i 



i 







4 





•"" 





> ^ 



'- 



7^- 



— 



■-• 





c - 



l 





— 



-. 



"" "> 







V 



^ 

 / 



a 





\ 



^ 



■7* 





00 







J£ 





K 















/' 



/ 1 



-- 



-/ 



r~ 



— j 



■ — 



"7 



/ 



• 



<> 



-- 



-- 







r 





■ 10 



3, 



j 



/ 



/ 



20 







i / 



m" 



■30 

 I 



\ 





/ 



, A 



00 







SG 



o" 















/ 







■/ 

































i] 



/ 







\ 





i" 





i 



/ 

























1 ' 



/V 



"H 





1 



























-3- 









f 



' 





-=S 





=/- 





--§ 





If 























^=5 



V 



/ 

































The curves for k' and k u present the same general feature 

 in iron, steel, and nickel. In iron and steel k' increases in 

 low fields, reaches a maximum, and then rapidly diminishes 

 till it becomes very small, so that the curve nearly coincides 



