IRON AND STEEL IN A ROTATING MAGNETIC FIELD. 
729 
Table II.—Hard Steel Armature of 147 Plates of thickness , 0141 centim. 
Variation of Hysteresis with induction. Diagram 4. 
Speed, 28 revs, per sec. 
Hyst. in 
Hyst. in 
B. 
ergs per 
cub. centim. 
B. 
ergs per 
cub. centim. 
per rev. 
per rev. 
865 
400 
16,200 
39,600 
1,300 
950 
16,700 
36,300 
1,730 
2,010 
17,100 
33,800 
2,160 
3,420 
17,500 
29,800 
2,610 
4,580 
17,700 
27,700 
2,940 
5,500 
17,900 
24,700 
3,450 
7,300 
18,100 
23,700 
3,680 
7,800 
18,200 
21,700 
3,900 
8,700 
4,320 
10,200 
7,160 
21,400 
8,850 
27,800 
11,700 
12,900 
14,100 
14,300 
15,000 
36,900 
40,800 
43,000 
43,500 
43,400 
Eddy currents = 
IT x 10 -6 B 2 ergs 
per cnb. centim. 
per rev. 
15,400 
42,700 
15,900 
40,700 
Speed, 56 revs, per sec. 
Hyst. in 
Hyst. in 
B 
ergs per 
B 
ergs per 
cub. centim. 
cub. centim. 
per rev. 
per rev. 
1,300 
1,000 
14,700 
44,400 
1,780 
2,0 L0 
15,000 
44,100 
2,160 
3,230 
15,500 
43,300 
2,610 
4,520 
15,900 
41,800 
3,040 
6,040 
16,300 
39,200 
3,460 
7,050 
16,800 
36,900 
3,900 
9,050 
17,300 
33,400 
4,320 
10,400 
17,600 
30,800 
4,600 
11,750 
17,800 
29,000 
5,800 
15,200 
18,000 
27,600 
6,900 
18,900 
18,100 
25,300 
8,100 
24,200 
18,200 
22,200 
10,300 
31,400 
18,300 
20,300 
11,200 
34,100 
12,100 
37,800 
13,100 
41,300 
Eddy currents = 
13,800 
43,500 
2-2 x 10-6 B^ ergs 
14,000 
43,900 
per cub. centim. 
14,300 
44 200 
per 
rev. 
Table III.—Hard Steel Armature of 105 
Diagram 4. Coned pole pieces. 
Plates of thickness '0141 centim. 
Speed, 26 revs, per sec. 
B. 
Hyst. in ergs 
per cub. centim. 
per rev. 
B. 
Hyst. in ergs 
per cub.centim. 
per rev. 
B. 
Hyst. in ergs 
per cub. centim. 
per rev. 
9,700 
32,700 
15,100 
43,300 
19,650 
10,700 
10,600 
36,300 
15,400 
42,400 
19,700 
10,200 
11,600 
39,100 
15,600 
42,000 
19,800 
7,900 
12,200 
40,700 
17,800 
' 29,500 
12,600 
41,800 
18,200 
24,700 
13,200 
42,300 
19,200 
18,300 
Eddy currents — 
13,600 
43,600 
19,500 
14,800 
DO X IQ' 
u B^ ergs 
14,800 
43,600 
19,600 
12,500 
per cub. centim. per rev. 
5 A 
MDCCCXCVI.—A. 
