1088 
DR. C. W. SIEMENS ON THE DYNAMO-ELECTRIC CURRENT 
No. 23. 
Helix: 24 part commutator, 288 convolutions, 3 m.m. wire, '173 S. U. resistance. 
Electro-magnets, 2556 convolutions, 3 m.m. wire, 4‘46 S. U. resistance. 
Revolutions per 
minute. 
Resistance 
in S. U. 
Reading on 
electro-dynamometer. 
Current in webers. 
E. M. F. in helix 
in volts. 
Horse-power. 
Percentage of 
energy turned 
into useful work. 
In 
outer 
circuit. 
Total 
in 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
492 
1 
•99 
240 
7-0 
160 
36-11 
6-16 
29-5 
33-41 
2-11 
1-62 
1-09 
51-66 
528 
262 
9-0 
185 
39-17 
6-99 
31-72 
36-21 
2-48 
1-9 
1-26 
50-81 
602 
345 
12-0 
235 
43-31 
8-08 
35-75 
40-04 
3-07 
2-32 
1-6 
52-12 
634 
410 
14-0 
280 
47-23 
8-88 
39-03 
43-66 
3-61 
2-76 
1-9 
52-63 
722 
450 
16-0 
300 
49-47 
9-33 
404 
45-73 
4-27 
3-03 
2-04 
47 "7S 
790 
540 
18-5 
335 
54-20 
10-03 
42-69 
50-10 
5-0 
3-64 
2-28 
4a"60 
856 
}> 
610 
21-0 
370 
57-60 
10-69 
44-86 
53-24 
5-76 
4-11 
2-52 
43-74 
