DR. C. W. SIEMENS ON THE DYNAMO-ELECTRIC CURRENT. 
1087 
No. 21. 
Helix : 24 part commutator, 288 convolutions, 3 m.m. wire, ‘173 S. U. resistance. 
Electro-magnets : 3200 convolutions, 2‘8 m.m. wire, 7’5G3 S. U. resistance. 
Revolution? per 
ruiuute. 
Resistance 
iu S. U. 
Reading on 
electro-dynamometer. 
Current in webers. 
E. M. F. in helix 
iu volts. 
Horse-power. 
Percentage of 
energy turned 
into useful work. 
Outer 
circuit. 
Total 
in 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
468 
1-0 
l-i'6 
170 
130 
30-41 
26-58 
30-10 
1-34 
1-23 
•884 
65-97 
532 
23-5 
185 
35 ; 75 
31-72 
35-38 
1-96 
1-69 
1-26 
64 21 
610 
310 
240 
41-06 
36-14 
40-64 
2-61 
2-24 
1-64 
62-83 
678 
365 
290 
44-56 
39-72 
44-10 
3-32 
2‘63 
1-98 
59-64 
716 
430 
335 
48"36 
42-63 
47-86 
3-79 
310 
2-28 
6 (> • 16 
788 
510 
385 
52'66 
4576 
5-2-12 
4-35 
3-67 
2 ; 63 
60-46 
860 
” 
” 
620 
430 
57-14 
. . 
48*36 
56"55 
5"03 
4-33 
2-93 
5768 
No. 22. 
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. 
Eleciro- 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
690 
C» 
4-63 
46 
46 
15-82 
15-82 
68-4 
2-67 
1-45 
702 
2-0 
1"55 
300 
24 
155 
40"4 
11-43 
29-03 
58-47 
401 
3-16 
2-11 
52-62 
694 
1 75 
1-43 
300 
22 
170 
40-4 
10-94 
30-41 
53-94 
3-97 
2-92 
2-03 
51-13 
698 
1-5 
1-29 
335 
20 
205 
42'69 
10-43 
33-39 
51-42 
399 
2-94 
2-09 
52-38 
696 
1-25 
1-15 
390 
18 
245 
46’06 
9-9 
36'50 
49-46 
4-12 
3-06 
2-08 
50-48 
696 
1-0 
•99 
395 
14 
265 
46-35 
8-88 
37-97 
42-85 
3-98 
2-67 
1-8 
45-22 
690 
•9 
•92 
390 
9 
290 
46"06 
6-99 
39-72 
39-56 
3-52 
2-44 
1-78 
50-57 
649 
•8 
•85 
385 
8 
290 
4575 
6*6 
39-72 
36-32 
3-39 
2-22 
1-58 
46-61 
706 
•7 
•78 
360 
7 
270 
44"25 
6-16 
38-32 
32-14 
3-02 
1-9 
1 29 
42-71 
684 
•6 
•702 
290 
2±5 
39'72 
36-50 
26 02 
2-65 
1-38 
1-0 
; 37-73 
684 
•5 
•623 
. . 
160 
29-50 
1-26 
■544 
43-18 
684 
*5 
•623 
140 
27-59 
16-05 
1-25 
•594 
•• 
