692 Mr. S. C. Laws on the Change of Resistance of Metals 



April 7th, 1909. 

 * = _186°C. Y=44. X = 800. r = 4"17. 



Current through 



Deflexion on 



Deflexion due 



magnet coils. 



reversal. 



to field. 







1405 





44 



83 



33 







91 





4-4 



435 



27 







50 5 





4-4 



2-5 



29 







125 





4-4 



- 41-5 



30 







- 33 





30= mean. 



The following table shows the actual 



results obtained. 



O. 



H. 



Deflexion on 

 reversal. 



drXiO*. 



^xio*. 



r 



H2 X 10~ 7 . 



3-4 



3230 



26-5 



21 



5-0 



105 



4-4 



3460 



30 



24 



5-7 



1-20 



5-6 



3680 



34 



27 



6-6 



1-35 



75 



3800 



425 



34 



8-2 



1-44 



10-0 



4060 



265 



37 



9-0 



1-65 



The ab 



ove resul 



ts are eoll< 



scted in 



the folio 



wing tab] 



which shows that : — 



OT 



(i.) — is practically proportional to H 2 at all temperatures: 



(ii.) for a given field — increases considerably as the tem- 

 perature falls. r 



H. 



3,-xio". 



H 2 r 



*=98. 



tf=55. 



*=16. 



*=-186. 



3230 









47-8 



3460 









47-5 



3680 









48-9 



3800 









56-8 



4060 









545 



8450 



1-02 



in 



2-68 





930G 



102 



1-64 



276 





10200 



•97 



153 



2-69 





11000 



•96 



1-53 



269 





11800 



100 



1-67 



2-62 





12600 



TOO 



1-57 



261 





13300 



•98 



1-52 



2-52 





•99 



1-60 



2-65 



51=mean. 



