Effect of Stress on Magnetizatit 



75 



Tungsten- Steel, 



t=n°-i c. 



T=159 



gr.^nm. 2 



T = 1784 



gr./rarn. 2 



T=4996 



gr./min. 2 



T=8251 



gr./nim . 2 



H. 



I. 



! 



H. 



I. 



H. 



I. 



H. 



I. 



2-33 



14-4 



2-35 



14-9 



2-77 



17-6 



2-33 



14-2 



4-68 



31-2 



5-14 



35-3 



5 - 54 



38-5 



4-60 



29-8 



7-90 



58-8 



8-85 



69-1 



9-07 



71-2 



7-99 



603 



12-07 



107-5 



12-41 



114-2 



12-87 



123-7 



1217 



113-6 



16-98 



202-3 



16-76 



212-9 



16-76 



223-6 



16-80 



241-8 



19-29 



304-7 



j 1900 



34L-2 



18-98 



381-7 



18-99 



449-0 



22-29 



532 



22-06 



597 



21-96 



631 



2202 



695 



27-73 



788 



27-66 



837 



27-46 



852 



27-64 



877 



33-94 



918 



33-60 



955 



33-91 



965 



3398 



976 



41-70 



10U5 



42-33 



1041 



42-72 



1045 



42-68 



1046 



63-2 



1115 



J 63-6 



1144 



632 



1137 



63-2 



1133 



105-2 



1207 



j 105-2 



1233 



105-2 



1223 



105-6 



1215 



1583 



1265 



158-4 



1291 



157'7 



1279 



158-5 



1268 



212-6 



1308 



212-7 



1327 



210-9 



1311 



211-6 



1304 



263-7 



1328 



269-1 



1342 



267-1 



1339 



268-7 



1330 



345-2 



1354 



346-3 



1380 



3438 



1364 



343-8 



1356 



(c) Change of Magnetization by Twist under Different 

 Tensions : (81, t)h,t. 



In Swedish iron and tungsten-steel, the curves (SI;, t) h ,t 

 (figs. 8, 10 > and 12) are similar to those for (§1, T) H for the 

 initial effect. In weak fields where the twisting considerably 

 increases the magnetization, the effect of the tirst untwisting 

 is very small and slightly increases the magnetization. In 

 Swedish iron, the cyclic effect of twisting (fig. 9) under low 

 tensions is always to diminish magnetization. With high 

 tensions (fig. 11), the effect has a singular character : for a 

 small twist, the magnetization increases, but for a large twist, 

 it is diminished. In tungsten-steel, the cyclic effect of twist 

 is similar to the cyclic effect of tension in Swedish iron, but 

 in amount it is very small. Curves (SI{, H) r ,T as deduced 

 from (SI;, t) h ,t are given in figs. 13, 14, & 15 (PI. II.) in fall 

 lines. They closely resemble those for the tension effect, 

 having points corresponding to the Villari points. With 

 considerable twist, (SI H) r ,T (figs. 13 and 14) is always 

 negative. The experimental numbers are given in the table 

 below : — 



