1086 
DR. C. W. SIEMENS ON THE DYNAMO-ELECTRIC CURRENT. 
No. 19. 
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. 
.d 
rS 
a 
. G 
. o 
^ > 
^ a 
P 
Horse-power. 
Perc' n‘a;.-,e 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. 
480 
1-0 
1:091 
98 
85 
23-09 
21-5 
23-53 
1 37 
•728 
■578 
42-19 
530 
135 
123 
27-09 
25-86 
27-60 
1-73 
100 
•837 
48-38 
602 | 
223 
195 
34-83 
32-57 
35-49 
2-33 
1-66 
1-33 
57-08 
670 
290 
250 
39-72 
36-88 
40-47 
3-14 
2-15 
1-7 
54-14 
744 
390 
320 
46 00 
41-72 
46-93 
3-95 
2:89 
2-18 
55-19 
800 
455 
380 
49-75 
45-46 
50'70 
4-73 
3-38 
2-59 
54-76 
864 j 
515 
430 
52-92 
48-36 
53-92 
5-64 
382 
293 
51-95 
911 
>> 
585 
490 
56-42 
51-63 
5749 
6-32 
435 
3-34 
52"85 
No. 20. 
Helix : 24 part commutator, 288 convolutions, 3 m.m. wire, “173 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. 
"a? 
. o 
s d 
w ■" 
Horse-power. 
A 
u 
•si g 
S —< 
» S =5 
Outer 
circuit. 
Total 
in 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Helix. 
Electro¬ 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
Percentag 
energy ti 
into usef: 
716 
CO 
7-74 
1 26 
26-0 
11-89 
11-89 
85-93 
2-04 
1-37 
710 
2-0 
1 *75 
; 300 
15 0 
195 
404 
903 
32-57 
66-01 
3-62 
3-57 
2-66 
73-48 
706 
1*75 
1-59 
i 320 
13 5 
220 
41-72 
8-57 
34-6 
61-93 
3"74 
3-46 
2-62 
70-05 
718 
1-5 
1-42 
360 
120 
255 
44-25 
8-08 
37-25 
58-66 
3:96 
3-48 
2-61 
65-91 
710 
1-25 
1 25 
| 395 
9-0 
290 
46-35 
6-99 
39-72 
54-10 
4-06 
3:36 
2-47 
60-84 
708 
1-0 
1-06 
| 445 
7 0 
340 
49-21 
6-16 
43-01 
48-70 
4-04 
3-21 
2-31 
57-18 
714 
•95 
102 
460 
6-0 
360 
50-03 
5-71 
44-25 
47-65 
3-79 
3-2 
2-33 
61-47 
706 
•9 
•977 
460 
37o 
50-03 
44:86 
45"6t 
3-75 
3-19 
9*27 
60-53 
710 
•8 
•896 
! 460 
5 0 
380 
50-23 
5-21 
45-46 
41:85 
3-62 
2-81 
2-07 
57-18 
714 
•7 
•814 
445 
4:0 
375 
49-20 
4-66 
45-16 
37-40 
3-35 
2-47 
1-78 
5313 
715 
•6 
•729 
390 
. . 
340 
46-06 
43-01 
31’35 
2-77 
1-94 
1:39 
50-18 
715 
•5 
•642 
. * 
230 
. . 
35-37 
•875 
710 
•5 
•642 
205 
* * 
195 
33-39 
* * 
32-57 
20-02 
1-3 
•896 
665 
51-15 
