on the Magnetic Properties of Iron. 

 was kindly furnished me by Mr. Clifford, A.R.C.Sc.I. 



23 



Al 



2-60 





 0-15 



Si 

 0-17 



P. 



0-13 



The dimensions of the ring were as shown :- 

 j<. 7-675 cms 



1-985 



The values of the induction for different magnetic forces 

 were first obtained at the ordinary temperature of the room, 

 with the following- results: — 



Force... 0085 025 0-64 0"85 1-06 170 2'12 3-39 

 I s n q d 'cm er } - 28 129 67 ° 1185 1931 4037 50G2 7437 



5-3 9-33 13-57 

 9201 11118 12077 



The susceptibility with respect to magnetic forces below 

 about 1*2 C.G.S. is even greater than in the case of the iron 

 specimen described above *. The second stage of the mag- 

 netizing process is brought on when the field is about 

 0'8 C.G.s. , and the maximum permeability obtained with a 

 force of about 2 c.G.s., while for iron the corresponding 

 values of the magnetic force were shown to be about 1 c.G.s. 

 and 2*2 c.G.s. respectively. 



The ring was examined in successive experiments while 

 the temperature was kept constant, and after each experiment 

 demagnetized by reversals. 



The values for the permeability in terms of magnetic 

 force for different temperatures are given in Table III. 



* The absence of this remarkable magnetic quality of aluminium steels 

 in the alloy referred to above containing 3-64 per cent, aluminium 

 is apparently due to the influence of the large percentage of other 

 elements present. The effect of any particular element on the magnetic 

 properties of iron varies very considerably according to the other 

 elements present and the percentage of these elements. 



