Effect of Stress on Magnetization. 73 



points. The decrease of magnetization reaches a maximum, 

 and then gradually diminishes tending to approach zero, as 

 the field is increased. This maximum decrease had been 

 anticipated from the theory of magnetostriction * by Professor 

 Nagaoka and one of us. Curves (SI*, H) T as deduced from 

 (SI„ T) H of the cyclic effect rise only slightly in weak fields ; 

 but in strong fields they nearly coincide with curves 

 (Sit, H) T for the initial effect. The following are the numbers 

 obtained by experiments. 



Swedish Iron. 

 Initial T=152 gr./mm. 2 ; £ = 16°'5 C. 





T=1562gr. 



T=30S6gr. 



1 = 4648 gr. T = 0211 gr. 



1 = 77 



77 gr. 



: H'. 















6-8 



0-9 



cl r 



n 



Bit. 



oI c - SI* 



«r 



«v 



«*■ 



1-25 



23-2 



1-9 



568 



3-2 



100-9 



4-5 1463 



6-9 



2-56 



31-3 



0-8 



94-4 



1-5 



184-4 



2-3 



275-8 



31 



343-7 



6-1 



4-37 



106-4 



o-i 



2262 



-0-2 



3269 



- 0-6 



397-8 



- 1-0 



444-0 



- 0-8 



5-88 



115-5 



-11 



197-8 



-1-9 



251-7 



- 2.8 



285-9 



- 40 



306-9 



- 50 



7"75 



68-7 



-1-7 



1L1-1 



-3-4 



140-9 



- 5-0 



1007 



- 6-7 



171-6 



- 8-5 



11-90 



25-3 



-2 6 



40-7 



-5-2 



510 



- 7-9 



57'3 



-105 



611 



-13-2 



2418 



1-5 



-3-4 



1-8 



-6-7 



11 



-102 



- o-i 



-1S-9 



- 1-9 



-17-4 



3655 



-2-7 



-3-8 



-51 



-7-8 



— 7 5 



-11-6 



-1U-3 



-15-5 -13-3 



-196 



97-1 



-4-0 





-7-8 





— 11-6 





-14-7 



... 1-18-2 





204-7 



-3-8 





-73 





-10-8 





-14-4 



... -18-1 





3666 



-2-7 





-5-1 



... 



— 80 





-106 



... '-13-3 





Tungsten- Steel. 

 Initial T=159 gr./mm. 2 : t = U°'2 C. 





T = 1625 



gr. mm.- 



T = 4837 



gr./mm. 2 



T=8092 



gr./iiim. 2 



H'. 















dli. 



SJ C . 



dli. 



cl c . 



cl.. 



CI : . 



4-0S 



04 



0-2 



2-6 



0-4 



6-5 



0-7 



10-63 



3-2 



V6 



13 



1-8 



277 



3-2 



15-70 



9-1 



1-0 



42-1 



4-2 



98-4 



8-1 



19-34 



400 



2-6 



142-3 



6-7 



214 9 



11-9 



23-85 



35-3 



2-0 



983 



6-1 



149-1 



109 



32-16 



16-2 



1-6 



436 



4-5 



676 



7-9 



43-36 



6-9 



1-2 



21-0 



3-4 



32 -8 



d-6 



98-4 



0-4 



0-4 



1-9 



0-4 



3-1 



o-i 



2100 



-0-4 . 



00 



-1-6 



-1-3 



-26 



-28 



3410 



-0-3 



-0-3 



-1-5 



—1-7 



-2-8 



-34 



* Xaa-aoka and Honda, Jour. Sc. Coll. xiii. p. 69 (1900) ; Phil. Ma<r. 

 xlix. p. 340(1900). 



