Magnetic Properties of Iron and Michel. 

 Table II, 



363 



Anhysteretic Intensity and Field at different Temperatures 

 in Nickel (C.G.S. units). 



Temp. 



H. 



L 



I (calc). 



! Temp. 



H. 



*• 



I (calc.). 





0-27 



39 



26 





0-27 



32 



20 





10 



87 



80 





1-8 



94 



95 





22 



135 



139 





4-1 



138 



158 





3-3 



163 



175 





5-6 



166 



182 



21° C. 



5-2 



199 



215 



225° C. 



8-6 



206 



213 





7-1 



223 



241 





12-8 



243 



239 





9-4 



250 



262 





14-3 



255 



245 





13-6 



291 



286 













15-5 



306 



293 













0-27 



45 



23 





0-5 



27 



27 





1-4 



100 



92 





1-8 



49 



70 





2'6 



128 



139 





3-3 



76 



97 





4-5 



165 



184 





5-2 



94 



116 



139° C. 



52 





196 



319° C. 



7-7 



118 



130 





71 



203 



220 





13-2 



152 



146 





9-4 



228 



239 





14-7 



161 



149 





13-2 



267 



260 













152 



281 



268 











of anhysteretic susceptibility as a function of the 

 intensity are drawn on Diagrams II. and V., and 



Curves 

 magnetic intensity are drawn on Uiagi 

 over the central range of intensities they approximate to 

 rectangular hyperbolas* 



(7) With a sufficient number of anhysteretic isothermal 

 curves it would be possible to construct isodynamic curves, 

 or curves of I and T for constant fields, but separate ex- 

 periments were instituted for the purpose. Simultaneous 

 observations of I and T in a constant field were made as the 

 temperature was raised to the highest point, and then lowered 

 to the original point. The curves which are exhibited in 

 Diagram I V. for iron, and Diagrams VI. and VII. for nickel, 

 trace the change of intensity for rising temperatures ; the 

 curves for falling temperatures are not plotted, but they are 

 nearly the same, except that in iron they are smoother, the 

 droop which occurs between 800° and 900° A. being less 

 pronounced. 



With nickel the curves are smooth and nearly coincident 

 for heating and cooling* 



* The crossing of the nickel curves of susceptibility for temperatures 

 21° C. and 139° C. shows that hysteresis is not completely suppressed. 



