328 Mr. H. A. Rowland on the Magnetic Permeability 



' Table II. 

 Cast Nickel, magnetic, at 12° C. 

 Experiments made December 6, 1873. 



«. 



8. 



ft. 



T. 



P. 



% 



fC. 



23-25 



1245 



53-55 







97-2 



4-18 



4769 



7786 



1633 



3095 



4691 



615-8 



12-91 



5778 



11460 



198-3 



3740 



7720 



907-3 



15-70 



73-43 



16040 



218-5 



5032 



11008 



1270-6 



17-30 



88-23 



19790 



224-3 



6554 



13236 



1568 



17-77 



107-3 



23530 



219-2 



7620 



15910 



1864 



1736 



153-8 



30160 



1961 



10940 



19220 



2388 



15-52 



206-3 



35880 



1740 



14030 



21850 



2839 



13-76 



296-4 



41310 



139-4 



18390 



22920 



3264 



1101 



421-8 



46520 



110-3 



22520 



24000 



3668 



870 



Table III. 



Cast Nickel, magnetic, at 220° C. 



Experiments made December 6, 1873. 



s. 



33. 



/i. 



T. 



P. 



3. 



K. 



2260 



4502 



199-2 



2671 



1831 



356-4 



1577 



45-06 



14000 



310-8 



5470 



8530 



1111 



24-65 



52-96 



16660 



314-6 



6350 



10310 



1322 



24-96 



67-42 



20300 



3011 



7722 



12578 



1602 



23-88 



80-69 



22540 



279-3 



8914 



13626 



1787 



2215 



106-4 



26420 



248-3 



11140 



15280 



2094 



19-68 



150-8 



30740 



203-8 



14040 



16700 



2434 



16-14 



191-0 



33530 



175-6 



15940 



17590 



2653 



13-89 



294-8 



38300 



129-9 



20240 



18060 



3024 



10-26 



553-6 



42630 



77-0 



24360 



18270 



3348 



605 



789-8 



43900 



55-6 



26060 



17840 



3431 



4345 





Experin 



ients mj 



ide Dece 



mber 10, 



1873. 





13-00 



1537 



118-2 







109-2 



9-33 



22-37 



4262 



190-5 









337-4 



1508 



25-15 



5337 



2122 







4227 



16-81 



3319 



9486 



285-8 



4055 



5431 



752-3 



2215 



43-28 



13570 



313-6 



5357 



8213 



1076 



24-88 



In Table I. are given the results for nickel at about 15° C, 

 together with the values of fju and k calculated from the formula? 

 given below the Table. We see that the coincidence is almost 

 perfect in both cases, which thus shows that the formula which 

 we have hitherto used for X and jm can also be applied to k, at 

 least within the limit of experiments hitherto made, although it 

 must at last depart from one or the other of the curves. The 



