IRON AND STEEL IN A ROTATING MAGNETIC FIELD. 
735 
Table VI.—Hysteresis of Soft Iron Armature with 
156 Plates of thickness ‘0081 
centim. Speed, 18 revs, per sec. Diagram 5. 
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. 
830 
350 
11,600 
11,700 
19,200 
5,700 
1,200 
545 
13,300 
14,200 
19,300 
4,600 
1,660 
816 
14,700 
15,600 
19,500 
3,900 
2,020 
1,110 
15,300 
15,900 
19,600 
3,400 
2,400 
1,500 
15,900 
16,100 
19,800 
2,600 
3.130 
2,180 
16,600 
15,600 
20,000 
1,700 
4,050 
3,060 
16,800 
14,900 
20,200 
1,200 
4,700 
3,940 
17,300 
14,200 
5,700 
4,900 
17,800 
12,500 
7,260 
6,800 
18,300 
10,400 
Eddy currents = 
9,020 
8,850 
18,800 
8.400 
3-0 X 10-7 B 2 . 
Table VII. — Soft Iron Armature of 250 Plates of thickness ‘0081 centim. Varia¬ 
tion of Hysteresis with Excessive Vibration. Diagram 7, Speed, 26 revs, 
per sec. 
Armature almost tight in bearings. 
Armature very loose in bear¬ 
ings. Excessive vibration. 
Hyst. in ergs 
Hyst. in ergs 
Hyst. in ergs 
B. 
per cub. centim. 
B. 
per cub. centim. 
B. 
per cub. centim. 
per rev. 
per rev. 
per rev. 
4,420 
3,280 
15,400 
13,900 
5,340 
4,050 
5,700 
4,840 
15,700 
14,200 
6,160 
4,820 
6,160 
5,200 
16,400 
14,400 
7,100 
5,800 
7,170 
6,550 
16,900 
14,600 
8,000 
6,750 
7,820 
7,330 
17,700 
14,600 
8,650 
7,100 
8,650 
8,300 
18,000 
14,100 
9,400 
8,050 
9,700 
9,500 
18,400 
12,700 
10,900 
10,000 
10,300 
10,000 
18,600 
12,500 
12,300 
12,000 
10,900 
10,500 
18,900 
11,200 
13,800 
12,400 
11,400 
11,300 
15,300 
13,000 
12,200 
11,900 
16,500 
13,000 
12,800 
12,600 
14,000 
13,200 
Eddy currents 
= 4-3 x 10~7 B 2 . 
14,700 
13,800 
Higher values of B were not possible as the vibrations threatened to break the pivots of the armature. 
