Dr. J. Hopkirison. 



[May 1, 



A. The following is the analysis of this sample : 



Fe. 

 97-96 



Ni. 

 0-97 



c. 



0-42 



Mn. 



0-58 



s. 



0-03 



r. 



0'04 per cent. 



In this case a magnetisation curve is all that I have obtained free 

 from doubt ; the sample was heated and its magnetisation deter- 

 mined at various temperatures for a force of O50, but the higher 

 temperatures must be taken as a shade doubtful, as the secondary 

 broke down before cooling, and I cannot be sure whether or not the 

 resistance of the secondary may have changed. 



Table I gives the results at the ordinary temperature for the 

 material before heating; these are plotted in Curve 1 together with 

 the curve for wrought iron, for comparison. 



Table I. 



Magnetising 

 force. 



0-06 



0-12 



0-26 



0-53 



1-07 



2-14 



47 



8-8 



16-8 



38-9 

 270-0 



Induction. 



11 



29 



58 



122 



303 



995 



4,560 



9,151 



12,876 



15,651 



21,645 



CURVE 1. 



