644 



Messrs. K. Honda and S. Sliimizu on 



In the present experiments the strength of the heating- 

 current and the temperature thereby caused were as 

 follows : — 



Current 



1*8 amp. 



29 



3-8 



4-7 



5-5 





Temperature . . . 



100° C. 



300 



600 



900 



1200 



The heating of nickel-steels protected in the manner above 

 described showed only a trace of surface-oxidation, if the 

 temperature did not exceed about 800° C. If, however, 

 the temperature was raised to 1200° C. the surface-oxidation 

 became considerable, so that the heating of some specimens 

 was stopped at about 800° C, if there was nothing of special 

 importance to be gained by heating them above that 

 temperature. 



(a) Magnetization of Ferromagnetic Metals. 



The ovoids were first cooled in liquid air ; the observations 

 at ordinary and then at higher temperatures were taken ; 

 the results are given in Table X. 



Table X. 

 Swedish Iron. 



*=714° C. 



rf=736° C. 



^=757° C. 



tf=761° C. 



H. 



I. 



H. 



I. 



H. 



I. 



H. 



I. 



0-13 

 026 



0-50 

 1-39 



2-48 

 22-46 

 258-6 

 377 



49 

 115 



338 

 533 

 597 

 744 

 829 

 834 



0-13 

 0-79 

 18-42 

 115-6 

 258-0 

 398 



40 

 220 

 373 

 493 

 542 

 561 



005 



3-29 



29-39 



125-8 



305 



425 



50 

 121 

 166 

 211 

 241 

 250 



8-1 

 75-5 



188-9 



333 



437 



118 

 390 

 64-5 

 85-3 

 97-6 





*=772° C. 



*=849° C. 



*=1009° C. 



*=1214° C. 



H. 



I. 



F. 



I. 



H. 



I. 



H. 



I. 



52 

 140 

 281 

 444 



63 

 15-4 

 23-1 

 290 



128 

 300 

 443 



20 

 3-4 



3-9 



99 



280 

 439 



1-7 



3-4 

 3-9 



92 



286 

 442 



1-4 



2-8 

 31 



