on the Magnetic Properties of Iron. 



29 



The following values of induction in terms of magnetic 

 force were obtained at the ordinary temperature of the room, 

 where H represents magnetic force and B induction : — 



H. 



B. 



H. 



B. 



H. 



B. 



H. 



B. 



0-155 



31 



\ 3- 10 



1270 



621 



7020 



11-64 



11737 



0-78 



186 



: 3-88 



2394 



776 



9069 



15-52 



13017 



2-33 



758 



, 543 



5620 



931 



10670 



2018 



13657 



As in the preceding experiments, the temperature was 

 kept as constant as was possible, and the magnetic force 

 varied. 



Table IV. gives the values of the permeability in terms of 

 magnetic force for different temperatures. These results are 

 plotted in fig. 14, the scale of abscissas for each curve being 

 regulated as in the corresponding curves for each of the 

 preceding specimens; the scale of ordinates is the same for 

 each curve. 



Table IV. 



Temperature 

 15° C. 



Magnetic 



Force 



(H). 



0155 

 0-39 

 0-78 

 1-55 

 233 

 310 

 3-88 

 4-66 

 5-43 

 6-21 

 6-98 

 7-76 

 9-31 

 1164 

 15-52 

 20-18 



Permea- 

 bility 



00- 



199 



219 



239 



274 



326 



409 



617 



850 



1034 



1130 



1168 



1168 



1146 



1008 



839 



677 



Temperature 



before experiment 



348° 0. 



Temperature 



after experiment 



350° C. 



Magnetic 



| 

 Permea- 



Force 



bility 



(H). 



00- 



0-155 



354 



0-39 



359 



0-78 



374 



1-55 



469 



2 33 



714 



2-72 



882 



310 



1070 



3-49 



1232 



3-88 



1335 



4-66 



1411 



543 



1391 



6-21 



1348 



698 



1283 



776 



1210 



10-09 



1036 



12-42 



894 



15-52 



770 



