456 
DR. J. HOPKINSON ON MAGNETIC AND OTHER PHYSICAL 
Table 22. 
Magnetising 
Galvanometer 
Resistance in 
Induction per 
force. 
kick. 
circuit. 
sq. cm. 
0075 
74-5 1 
76-5 J 
1-26 
26 
0T5 
175-01 
180-0 J 
62 
0-3 
51- 5 1 
52- 5 J 
11 26 
161 
0-6 
125-01 
125-0 J 
389 
1-2 
2,31-0 1 
2-24-0 J 
21-26 
1,331 
2-2 
223-0 1 
2240 J 
101-26 
6,272 
4-0 
1 
361-0 
365-0 J 
10,192 
7-7 
224-0 1 
229-0 J 
201-26 
12,576 
13-1 
252-01 
254-0 J 
14,016 
20-4 
266-01 
269-0 J 
14,847 
28-8 
277-01 
276-0 J 
15,346 
517 
292-01 
292-0 
16,455 
It will be seen that this series agrees very closely with Table 20, evidence of the 
general accuracy of the results. 
The ring was lastly demagnetised and heated to a resistance of secondary of 
3*19, temperature 787° C., under a magnetising force *075, which was removed when 
the ring was at its highest temperature ; the ring was cooled, and the following 
observations made. In this case, however, the first kick was due to a reversal from a 
current opposed to the current which was applied during heating. 
Table 23. 
Magnetising 
Galvanometer 
Resistance in 
Induction per 
lorce. 
kick. 
circuit. 
sq. cm. 
0-075 
84-01 
84-5 J 
1-43 
33 
0-15 
192-0 1 
195-0 J 
1-43 
75 
0-3 
55 
60-01 
62-0 J 
11-43 
192 
0-6 
153- 01 
154- 0 
480 
1-2 
321-0 1 
? 302-5 J 
21-43 
1,891 
2-2 
55 
239-0 
238-0 J 
101-43 
6,678 
4-0 
55 
367-01 
366-0 
"5 
10,262 
7-3 
227-0 
226-0 
201-43 
12,576 
