DR. C. W. SIEMENS ON THE DYNAMO-ELECTRIC CURRENT. 
1081 
No. 9. 
Helix : 24 part commutator, 33G convolutions, 2'5 m.m. wire, '4014 S. U. resistance. 
Electro-magnets: 512 convolutions, 5'6 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. 
Horse power. 
j Percentage 
of energy 
turned 
into useful 
work. 
In 
outer 
circuit. 
Total 
in 
circuit. 
Expended. 
Total 
developed. 
Developed 
in outer 
circuit 
450 
1 
1-71 
100 
23-33 
37-24 
1-56 
1-16 
•681 
43-65 
500 
145 
28-03 
44-S4 
2-14 
1 69 
•987 
46-12 
550 
190 
32-14 
51-32 
2-69 ■ 
2-21 
1-29 
47"95 
600 
235 
35-75 
57-08 
3-43 
2-73 
1-60 
46-65 
650 
290 
39-72 
63-42 
4-24 
3-37 
1-97 
46-46 
700 
360 
44-25 
70-65 
5-00 
418 
2-45 
49-00 
750 
420 
47-80 
76-32 
5-81 
4-89 
2-86 
49-22 
800 
91 
490 
51-63 
82-44 
6-86 
5-70 
3-34 
48-69 
No. 10. 
Helix: 24 part commutator, 312 convolutions, 2'8 m.m. wire, ‘234 S. U. resistance. 
Electro-magnets : 3200 convolutions, 2’8 m.m. wire, 7'563 S. U. resistance. 
Revolutions per 
minute. 
Resistance 
in S. U. 
Reading on 
electro-dynamometer. 
Current in webers. 
E. M. F. in helix 
iu volts. 
Horse-power. 
Percentage of 
energy turned 
iDto uselul work. 
In 
outer 
circuit. 
Total 
in 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 1 
circuit. 1 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
502 
o° 
7 8 
13 
13 
8-41 
8-41 
61-25 
1-33 
•69 
513 
12-0 
4-87 
30 
12 
5 
12-77 
8-08 
5-21 
5S-07 
1-47 
•994 
•409 
27-82 
517 
10-0 
4-54 
35 
12 
7 
13-80 
8-08 
6-17 
58-50 
1 "58 
1-082 
•476 
30-12 
520 
9-0 
4-34 
42 
12 
9 
15-11 
8-08 
7-0 
61-23 
1-59 
1-251 
•552 
34-72 
498 
S 7-5 
3-99 
40 
10 
10 
14"75 
7-37 
7-37 
54-95 
1-42 
1-086 
•510 
35-90 
501 
6-0 
3-51 
42 
8 
15 
15-11 
6'60 
9-03 
50-36 
1 53 
1-020 
•612 
40-00 
500 
4-5 
3-05 
50 
7 
22 
16-49 
6-17 
10-94 
46-96 
1-53 
1-038 
•674 
44-05 
510 
3-5 
2-62 
75 
7 
35 
20-20 
6-17 
13-8 
49-41 
1-77 
1-338 
•834 
47-12 
502 
3-0 
2-38 
82 
6 
42 
21-12 
5-71 
15-11 
46-93 
1 74 
1-329 
•857 
49-25 
507 
2’5 
2-11 
90 
6 
50 
22-12 
5-71 
16-49 
43-58 
1-86 
1-292 
•851 
45'75 
502 
! 2-0 
1-81 
120 
6 
85 
25-55 
5-71 
21-5 
43-18 
1-95 
1-479 
111 
56-92 
495 
1-75 
1-65 
140 
6 
95 
27-59 
5-71 
22-73 
42-5 
1-92 
1-572 
M3 
58-85 
492 
1-5 
1-48 
160 
5 
no 
29-50 
5-21 
24 46 
40-77 
2-01 
1-612 
1-12 
55-72 
504 
1-25 
1-30 
190 
4 
140 
32-14 
4-66 
27-59 
39-01 
2-16 
1-681 
1-19 
55"09 
506 
1-1 
1-19 
205 
4 
157 
1 33-39 
4-66 
29-21 
37-12 
2-27 
1-661 
1-16 
51-10 
512 
i-o 
Ml 
200 
4 
155 
32-98 
4-66 
29 03 
3418 
2-09 
1-511 
1-05 
50-23 
505 
•85 
•998 
225 
4 
180 
34-98 
4-66 
31-30 
32-60 
1-96 
1-528 
1-04 
53-06 
510 
•75 
•917 
220 
4 
183 
I 34-60 
4-66 
31-55 
29-63 
1 87 
1-374 
•934 
49-95 
507 
•6 
•790 
160 
3 
120 
1 29-50 
4-04 
25’55 
21-77 
1-45 
•S61 
•490 
33 79 
G z 
MDCCCLXXX 
