ON THE MAGNETIC QUALITIES OE IRON. 
995 
Ring II. (Small cycles.) 
Cycle (12). 
Cycle (13). 
Cycle (14), 
Cycle (15). 
Cycle 
(16). 
H. 
B. 
H. 
B. 
H. 
B. 
H. 
B. 
H. 
B. 
3-930 
925 
3-105 
590 
2-145 
320 
1-340 
170 
0-787 
89 
2-315 
750 
1-995 
480 
1-215 
220 
0-905 
135 
0-422 
52 
1-260 
605 
1-155 
380 
0-840 
185 
0-680 
110 
0-203 
34 
0-695 
505 
0-630 
295 
0-535 
135 
0-385 
75 
0 
12 
0 
395 
0-325 
245 
0 
75 
0 
30 
-0-267 
-21 
-0-265 
320 
0 
195 
-0-265 
25 
-0-160 
10 
-0-534 
-58 
-0-535 
265 
-0-425 
125 
-0-535 
- 10 
-0-5.35 
- 35 
-0-787 
-89 
-1-070 
130 
1-070 
- 25 
-1-070 
-110 
-0-800 
- 85 
— 
- 50 
1-605 
-160 
-1-550 
-210 
- 1-070 
-120 
1 -2-140 
-210 
3-100 
-590 
-2-140 
-320 
-1-340 
-170 
1 -2-670 
-405 
2-185 
-320 
1 -2-885 
-520 
-3-930 
-925 
These, with the exception of No. 15, are drawn out in fig. 6 (Plate 35). 
Measuring areas as before we find the energy dissipated in the cycles :— 
Ring II. — Fine Steel Wire. Energy dissipated in cyclic process of double reversal 
of maofnetisra. 
O 
No. of Cycle. 
Limits of H. 
Limits of B. 
1 II dl, ergs. 
1 
43-91 
17680 
45770 
2 
32-42 
16720 
41320 
3 
21-89 
15040 
34330 
4 
13-66 
12070 
23460 
5 
10-98 
10190 
18100 
6 
8-91 
8090 
12820 
7 
7-48 
6170 
8300 
8 
6-12 
3960 
4310 
9 
4-76 
1820 
1130 
10 
4-08 
1180 
540 
12 
3-93 
925 
307 
13 
3-105 
590 
125 
14 
2-145 
320 
30 
16 
0-787 
89 
1-4 
Fig. 7 gives the value of | H dl for this ring and also for Ring I., in relation to H, 
and fig. 8 (Plate 36) gives them in relation to B. 
Fig. 8a further shows to a larger scale the relation of | H (il to B in the low-cycle 
tests of Ring II. It is interesting, as an example of the growth of J H dl in the 
region of low magnetic force, when the effects of hysteresis are only beginning to be 
6 L 2 
