DR. C. W. SIEMENS ON THE DYNAMO-ELECTRIC CURRENT. 
1077 
The Tables marked 16, 17, 18, 19, 20, 21, 22, and 23 show the results obtained 
with a machine having a helix wound with 288 convolutions of 3 m.m. wire and a 
resistance of T73 S. units. The electro-magnets, as before, had a resistance of 11'26, 
7'563, and 4'46 S. U. 
No. 1. 
Helix: 24 part commutator, 312 convolutions, 2'8 m.m. wire, '234 S. U. resistance. 
Electro-magnets: 3916 convolutions, 2'5 m.m. wire, H'26 S. U. resistance (con¬ 
nected parallel to outer circuit). 
Revolutions per 
minute. 
Resistance 
in S, U. 
Reading on 
electro-dyn amome ter. 
Current in webers. 
E. M. P. 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. 
Electro¬ 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Tolal 
developed. 
Developed 
in outer 
circuit. 
500 
o-o 
o-o 
•205 
•01 
•25 
*5 
1-63 
. . 
•3804 
•000831 
•02 
•26 
•5 
1-63 
•3957 
•000864 
•05 
•28 
10 
2-33 
. , 
•6091 
•00190 
•10 
■34 
1-5 
2-86 
•9079 
•00348 
. . 
•25 
•48 
2-0 
3-30 
, . 
. , 
1-479 
•00654 
•50 
•72 
14-0 
1-0 
12 
8-80 
2-33 
8-08 
5-915 
•714 
•0698 
•0409 
5-73 
•75 
•94 
130-0 
1-5 
115 
26-58 
2-86 
25-01 
23-32 
1-43 
•881 
•587 
41-04 
1-0 
116 
180-0 
2-0 
145 
31-30 
3-30 
28-08 
33-90 
1-83 
1-422 
•987 
53-93 
1-25 
1-36 
145-0 
2-0 
125 
28-08 
3-30 
26-07 
35-65 
1-342 
1-063 
58-08 
1-5 
1-56 
135-0 
3-0 
115 
27-09 
4-04 
25-01 
39-46 
1-433 
1-17 
63-93 
1-75 
1-75 
132-0 
3-0 
102 
26-79 
4-04 
23-55 
43-77 
1-592 
1-21 
66-12 
2'0 
1-94 
120-0 
3-5 
95 
25-55 
4-36 
22-73 
46-28 
1-73 
1-585 
1-29 
69-94 
>> 
OO 
•• 
5-0 
4-0 
0 
5-21 
4-66 
•• 
•714 
•• 
•• 
No. 2. 
Helix : 24 part commutator, 312 convolutions, 2*8 m.m. wire, '234 S. U. resistance. 
Electro-magnets: 3916 convolutions, 2'5 m.m. wire, 11'26 S. U. resistance (con¬ 
nected parallel to outer circuit). 
Revolutions per 
minute. 
Resistance 
in S. U. 
Reading on 
electro- dynamometer. 
Current in webers. 
E. M. P. 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. 
Electro¬ 
magnet. 
Outer 
circuit. 
Ex¬ 
pended. 
Total 
developed. 
Developed 
in outer 
circuit. 
600 
o-o 
•24 
0 
•245 
•25 
•48 
1 
, , 
2-33 
1-044 
•0032 
•50 
•72 
5 
5-21 
3-502 
•0244 
, , 
•75 
•94 
125 
115 
26-07 
25-01 
22-87 
1-714 
•799 
•587 
34-24 
1-0 
1-16 
215 
2-0 
175 
34-20 
3-3 
30-86 
37-04 
2-45 
1-70 
1-16 
47-34 
1-25 
1-36 
195 
2-5 
153 
32-57 
3-69 
28'84 
41-35 
1-805 
1-3 
53-06 
1-50 
1-56 
185 
3-5 
144 
31-72 
4-361 
27-99 
46-20 
2-33 
1-96 
1-47 
63-09 
1-75 
1-75 
164 
4-0 
125 
29-87 
4-66 
26-07 
48-80 
2-20 
1-95 
1-49 
67-72 
2-0 
1-94 
160 
4-0 
120 
29-50 
4-66 
25-55 
53-43 
2-12 
1-633 
74-22 
” 
CO 
11-50 
6 
5-0 
0 
5-71 
5-21 
•• 
65"66 
1-10 
•503 
• • 
