DR. C. W. SIEMENS ON THE DYNAMO-ELECTRIC CURRENT. 
1079 
No. 5. 
Helix : 24 part commutator, 336 convolutions, 2’5 m.m. wire, ’4014 S. U. resistance. 
Electro-magnets: 512 convolutions, 5’5 m.m. wire, ‘3065 S. U. resistance. 
Revolutions 
per minute. 
Resistance in S. U. 
Reading on 
electro¬ 
dynamometer. 
Current 
in 
webers. 
E. M. F. 
in 
volts. 1 
Horse-power. 
Percentage 
of energy 
turned 
into useful 
work. 
In 
outer 
circuit. 
Total 
in 
circuit. 
Expended. 
Total 
developed. 
Developed 
in outer 
circuit. 
750 
CO 
•306 
8-9 
9*61 
1 
2-33 
20-90 
•0653 
•0605 
19-77 
6-0 
6-71 
1 
14-59 
•0455 
•0408 
13-33 
4-5 
5-21 
1 
11-33 
•0353 
•0306 
10-00 
745 
3-5 
4'21 
7 
6-17 
24-25 
•304 
•205 
•167 
54-93 
760 
3-25 
3-96 
16 
9-32 
3446 
•620 
•430 
•353 
56-90 
758 
3-0 
3-71 
26 
11-89 
41-18 
•773 
•656 
•531 
68-70 
750 
2-75 
3-46 
40 
14-75 
47-65 
1-224 
•942 
•749 
61-19 
740 
2-5 
3’20 
66 
18-95 
5662 
1-660 
1-44 
1-12 
67-67 
756 
2-25 
2-96 
85 
21-50 
59-42 
2-16 
1-71 
1-30 
60-18 
774 
2-0 
2-71 
120 
25-55 
64-65 
269 
2 21 
1-63 
60-59 
768 
■ 1-75 
2-46 
165 
29-96 
68-81 
3-45 
2-76 
1-97 
57-10 
736 
1-5 
2-21 
215 
34-20 
70-57 
3-90 
3-23 
2-20 
56-41 
710 
1-25 
1-96 
260 
37-61 
68-80 
4-35 
3-47 
2-21 
50-80 
724 
1-0 
1-71 
330 
42-37 
67-65 
5-02 
3-84 
2-25 
44-82 
736 
•9 
1-61 
520 
53-17 
79-92 
6-16 
5-69 
3-16 
51-29 
•8 
1-51 
570 
55-67 
78-49 
6-91 
5-86 
3-10 
44-87 
•75 
1-46 
625 
58-31 
79-48 
6-91 
6-21 
3-19 
46-16 
No. 6. 
Helix : 24 part commutator, 336 convolutions, 2*5 m.m, wire, ’4014 S. U. resistance. 
Electro-magnets : 512 convolutions, 5'5 m.m. wire, ‘3065 S. U. resistance. 
Revolutions j 
per minute. [ 
Resistance in S. U. 
Reading on 
electro¬ 
dynamometer. 
Current 
in 
webers. 
E. M. F. 
in 
volts. 
Horse-power. 
Percentage 
of energy 
turned 
into useful 
work. 
In 
outer 
circuit. 
Total 
in 
circuit. 
Expended. 
Total 
developed. 
Developed 
in outer 
circuit. 
500 
3-5 
•257 
496 
3-0 
3-71 
1-5 
2-86 
9-90 
•405 
•0379 
•0307 
7-58 
505 
2-5 
3-21 
2 
3-29 
9-86 
•515 
•1434 
•0338 
6-563 
516 
2-0 
2-71 
9 
6-99 
17-68 
•579 
•165 
•122 
21-07 
520 
1-75 
2-46 
42 
15-11 
34-70 
•796 
■702 
•500 
62-81 
490 j 
1-5 
2-21 
60 
18-06 
37-26 
1-20 
•902 
•612 
51-00 
496 
1-25 
1-96 
120 
25-55 
46-75 
1-82 
1-61 
1-02 
56-04 
490 
1-0 
1-71 
180 
31-30 
49-97 
2-30 
2-09 
1-23 
53-47 
490 
•85 
1-56 
245 
36-50 
53-16 
2-80 
2-60 
1-42 
50-71 
504 
•75 
1-46 
280 
39-03 
53-20 
3-08 
2-78 
1-43 
46-42 
502 
•65 
1-36 
320 
41-72 
52-97 
3-08 
2-96 
1-41 
45-79 
•60 
1-31 
340 
43-01 
52-60 
3-58 
3-03 
1*39 
38-83 
•55 
1-26 
355 
43-94 
51-68 
3-58 
3-04 
1-33 
37-15 
488 
*50 
1-21 
385 
45-76 
51-70 
3-58 
317 
1-25 
34-92 
•45 
1-16 
420 
47-80 
51-77 
3-78 
3-32 
1-29 
3413 
•40 
1-11 
491 
51-63 
53-49 
3-9S 
3-70 
1-33 
33 42 
•35 
1-06 
510 
52-66 
52-10 
4-08 
3-68 
1-21 
29-65 
•30 
1-01 
600 
57-12 
53-89 
4-28 
4-12 
1-22 
28-51 
if 
•25 
•96 
630 
58-54 
52-46 
4-58 
4-11 
1-07 
23-36 
