Length in Iron, Steel, and Nickel voids by Magnetization. 331 



a gives the semi-minor axis, c the semi-major axis, v the 

 volume, p the density, and N the demagnetizing factor of the 

 ovoids. The volume of each specimen was measured by 

 weighing the ovoids in water. 



The elastic constants of these metals were measured by 

 flexure and torsion experiments on rectangular prisms made 

 from the same specimens as the ovoids. The prisms were 

 14*6 cm. long and 0'896 cm. sq. in cross-section. E gives 

 Young's modulus, K ( = w, using Lord Kelvin's notation) the 

 modulus of rigidity, and 6 the constant defined by the 

 equation 



■2\1 + -A0J *" 



Metal. 



E (C.G.S.). 



K (C.G.S.). 



e. 



Nickel 



2-07 XlO 12 

 2-10 xlO 12 

 2-04 XlO 12 

 2-02 xlO 12 



0771 XlO 12 

 800 xlO 12 

 0-838 xlO 12 

 0-849 xlO 12 



1-082 

 0-844 

 0-384 

 0-306 



Soft Iron 



Steel 



Wolfram Steel ... 



The magnetization of each of these ferromagnetics was 

 determined by the magnetometric method, after the ovoids 

 had been carefully annealed, with the following results : — 



Nickel (2). 



Soft Iron (4). 



Steel (6). 



Wolfram 



Steel (8). 



H. 



I. 



H. 



I. 



H. 



I. 



H. 



I. 



07 



24-2 



10 



62 



1-9 



23 



2-7 



18 



1-4 



49-8 



2-5 



160 



2-4 



44 



6-8 



65 



30 



138-6 



4-3 



291 



6-9 



183 



12-6 



193 



54 



238-0 



9-5 



587 



9-7 



279 



20-2 



498 



109 



336-8 



12-7 



750 



13-1 



385 



25 8 



748 



37-8 



395-7 



19-9 



948 



233 



651 



44-5 



992 



74-1 



420-0 



372 



1111 



323 



815 



83-6 



1116 



1253 



434-5 



99-6 



1255 



50-2 



984 



1180 



1170 



171-6 



438-7 



155-5 



1309 



116-3 



1196 



1910 



1224 



240-3 



440-7 



2703 



1400 



1744 



1260 



344-6 



1301 



4814 



443-4 



4336 



1479 



345 



1379 



5123 



134S 



674-2 



444-5 



584-6 



1520 



520-2 



1440 



666-6 



1373 



914-0 



4468 



792-8 



1546 



873 7 



1489 



940-3 



1400 



12330 



447-7 



992-6 



1562 



1149-8 



1512 



1213-3 



1423 



17470 



448-7 



1585-8 



1607 



1822-6 



1549 



1674-9 



1452 



2 A 2 



