and Maximum of Magnetism of Nickel and Cobalt. 327 



them. And this, with the small amount of time at my disposal, 

 will account for the late day at which I publish my results. 



The following is the notation used, the measurements being 

 made on that absolute system in which the metre, gramme, and 

 second are the fundamental units, 



«£) is the magnetizing-force acting on the metal. 

 S is the magnetic induction within the metal (see Maxwell's 

 1 Treatise on Electricity and Magnetism/ arts. 400, 592, 

 and 604). 



fjt, is the magnetic permeability of the metal = -~- =47r/e + l. 



T is the portion of 33 which disappears when the current is 



broken. 

 P is the portion of 33 which remains when the current is 



broken. 



3 is the intensity of magnetization =--j — -• 



47T 



3 



k is Neumann's coefficient of induced magnetization = ~ 



Table I. 



Cast Nickel, normal, at 15° C. 



Experiments made November 29, 1873. 



<p. 



S3. 



Ob- 

 served. 



fX. 



Calcu- 

 lated. 



Error. 



T. 



P. 



3. 



K. 



Ob- 

 served. 



K. 



Calcu- 

 lated. 



Error. 



12-84 



675 



52-6 



46-4 



-6-2 







52-7 



410 



3-65 



-•45 



26-85 



2169 



80-8 



80-6 



- -2 



i*263 



906 



170-5 



6-35 



627 



-•08 



4514 



7451 



1651 



166-8 



17 



2894 



4557 



589-3 



13-06 



13-08 



•02 



5612 



11140 



198-5 



199-1 



•6 



3788 



7352 



882-0 



15-72 



15-70 



-02 



70-78 



15410 



217-8 



2175 



- -3 



5018 



10392 



1221 



17-25 



1721 



-•04 



77-52 



17100 



220-6 



220-6 



•0 



5454 



11646 



1355 



17-47 



17-47 







90-76 



20180 



222-3 



222-0 



- -3 



6183 



13697 



1599 



17-61 



17-60 



-•01 



115-4 



25170 



218-2 



214-3 



-3-9 



8313 



16857 



1994 



1728 



16-98 



-•30 



139-4 



28540! 204-7 



204-3 



- -4 



10100 



18440 



2260 



16-21 



16-18 



-03 



172 9 



32460 187-8 



186-6 



-1-2 



12530 



19930 



2569 



14-86 



14-93 



07 



195-3 



34630 1773 



1791 



1-8 



13320 



21310 



2740 



1403 



1412 



•09 



229-5 



37340 ! 162-8 



165 5 



2-7 



15720 



21620 



2953 



1287 



1302 



•15 



275-9 



40860; 148-1 



1463 



-1-8 



17960 



22900 



3230 



11-71 



11-46 



-•25 



415-2 



46470 111-9 



112-8 



•9 22560 23910 



3665 



8-82 



S-77 



-•05 



727-0 



52690, 72-5 



72-8 



•3 128020 24670 



4135 



5-69 



5-64 



-05 



1042 



55680 53-4 



52-8 



- -6 30G80 25000 



4344 



417 



417 



•0 





63420 









4940 











= 222 sin g+»£+Sgl K = 17-6 sin fl**!^ 1 ™ 



359 



28 



