Properties of the Alloys of Iron and Aluminium, 141 



These results are plotted on fig. 12. The curve obtained 

 is very similar in general shape to a B and H curve, and does 

 not differ materially in shape from the analagous curves for 

 the next alloy considered. The changes of the induction 

 with temperature are, in fact, of the same nature as those we 

 should obtain if we were dealing with two rings of different 

 compositions superposed one upon the other. 



The B and H curves shown on fig. 9 were obtained 

 from the readings given in the Table on p. 140. 



Fiff. 13. 



700 



600 



500 



400 



300 



200 



100 













f 





III 







f r\ 



I 



r 



H = 4-09_ 



^tf^-k 









H=3-lg 



H=l2-22 









V \ 











H=2-gO_ 











H=«-04 









^ 



H = 0-49_ 









T 







100 



POO 



300 



400 



500 



On figs 13 & 14 are shown the curves connecting (1) the 

 permeability and temperature when the maximum field 

 reached at each reversal is maintained constant, and (2) the 

 permeability and field-strength when the temperature is 

 constant. The greatest permeability is reached at 380° C. 

 for fields of about 3*0 C.G.S. units, but the increase in per- 



