DR. C. W. SIEMENS ON THE DYNAMO-ELECTRIC CURRENT. 
1085 
No. 17. 
Helix: 24 part commutator, 288 convolutions, 3 m.m. wire, '173 S. U. resistance. 
Electro-magnets: 3916 convolutions, 2'5 m.m. wire, 11'26 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. 
^ O P 
O H ^ 
80-5 — 
[ s 
S » 3 
$ § 
in 
outer 
circuit. 
Total 
in 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
■ 
665 
•25 
•42 
3 
3 
4-04 
4-04 
1-58 
•271 
•0085 
•0051 
1-82 
670 
•5 
•652 
30 
28 
12-77 
12-34 
7-74 , 
•547 
•132 
•095 
17-37 
665 
•75 
•875 
245 
2-0 
225 
36-50 
33 
34-98 
29-85 
2-01 
1-45 
Ml 
55-88 
660 
•85 
•963 
255 
2*5 
235 
37-25 
3-69 
35-75 
33-49 
229 
1-67 
1-36 
59-38 
640 
1-0 
1-09 
290 
3-0 
260 
39-72 
4-04 
37-61 
40-42 
2-61 
2-15 
1-77 
67-81 
645 
1-1 
1-17 
272 
3-0 
230 
38-47 
4-04 
35-37 
42-02 
2"63 
2-17 
1-72 
65-40 
650 
1-25 
1-29 
250 
3-5 
205 
36-88 
4-36 
33-39 
44-42 
2-65 
2-2 
1-74 
65"66 
645 
1-4 
1-42 
255 
4-0 
185 
35 75 
4"66 
31-72 
47-39 
2-63 
2-27 
1-76 
66-92 
650 
1-5 
1-5 
228 
4'0 
180 
35-22 
4-66 
31-3 
49-33 
2-52 
2-33 
1-84 
73-01 
660 
1-75 
1-69 
200 
4 5 
153 
32-98 
4-94 
28-84 
52-04 
2‘56 
2-3 
1-82 
71-09 
660 
2-0 
1-87 
180 
5-0 
145 
31-3 
5'21 
28-08 
54'65 
2-42 
2-29 
1-97 
81-40 
No. 18. 
Helix : 24 part commutator, 288 convolutions, 3 m.m. wire, '173 S. U. resistance. 
Electro-magnets : 3916 convolutions, 2'5 m.m. wire, 11'26 S. XJ. 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. 
i 
Outer 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
817 
11 
1-17 
435 
360 
48 - 65 
44-25 
53-15 
4-67 
3-47 
2-69 
57-6 
812 
1-0 
1-09 
465 
385 
50-29 
45-76 
51-11 
4-81 
3-44 
2-61 
54-26 
815 
1-25 
1-29 
405 
5-0 
335 
46-94 
5-21 
42-69 
56-53 
4-82 
3"56 
2-85 
5912 
820 
1-5 
1-5 
370 
5*5 
290 
44-86 
5-47 
39-72 
62-83 
4-85 
3-78 
2-96 
61-03 
814 
1-75 
1-69 
330 
250 
42-37 
36-88 
66-85 
4-82 
3-8 
2-98 
61-82 
812 
2 0 
1-87 
300 
220 
40-40 
, , 
34-6 
70-54 
4'64 
3-82 
3-00 
64-65 
824 
•9 
1-01 
450 
385 
49-47 
45"7 6 
46'65 
4-71 
3-09 
2-36 
50-10 
820 
•8 
-92 
450 
390 
49-47 
46-06 
42-56 
4-35 
2-82 
2*L2 
48-73 
808 
■75 
•876 
430 
390 
48-36 
46-06 
39-55 
4-12 
2-56 
1-99 
48-30 
840 
■6 
■743 
220 
215 
34-60 
34-2 
24 00 
2-4 
1-11 
•878 
36-58 
830 
•5 
•652 
100 
, . 
23-32 
2-37 
•34 
14-34 
820 
•5 
■652 
75 
70 
20-20 
•• 
19-51 
12-30 
2-34 
■333 
•238 
10-16 
