IOWA ACADEMY OF SCIENCE 
175 
DATA NO. 5. 
DETERMINATION OP W. 
Time 
Temp, of B. 
Temp, of R’m. 
Heat Rad. 
Heat in B . 
Total Heat 
W 
Q-4A— 10-40 
6. - 8. 
7.25 
—1751 
6063.2 
43(^.2 
|?i- 40—10-40 
9.5-10.25 
4.9 
4-11150 
2273.6 
13423.Q 
90-40—9:1 -40 
12. -12.6 
7.5 
4-11400 
1818.9 
13218.9 
Sr4n — 4!40 
18.5-18.5 
14. 
4-11150 
3000.0 
11150.0 
S- 40— 10-40 
17.5-18.5 
16. 
4-2579 
3031.6 
5510.6 
DATA NO. 6. 
DETERMINATION OP HEAT COEPPICIENT DE^DT. 
Time 
E 
P. D. 
C. 
T 
W 
de-^dt 
9:40 
1.8042 
1 2240 
8.907 
280 00° 
4309.2 
-f. 000062 
-f .00053 
-f. 00066 
-}-.00136 
4-.00237 
15:40 
1.7264 
1 0985 
7.324 
283 25° 
13423.6 
21:40 
1.7075 
.9821 
6.379 
285.60° 
13218.9 
11150.0 
3:40 
1.4327 
.6072 
2.699 
291 50° 
8:40 
.4194 
.1473 
.905 
292.00° 
5610.6 
DATA NO. 7. 
DETERMINATION OP E. M. P. 
Time 
N 
M 
E 
de-^-dt 
E. M. F. 
9-49 . _ 
23057. 
19033 
1.830 
4-. 0000625 
—.00053 
1.8475 
1.6001 
1.4147 
1.3863 
1.0135 
15:40 . 
22659. 
19033 
1.813 
91-40 
20503. 
19033 
1.719 
— .00060 
3:40 ; . 
21625. 
19033 
1.767 
—.00136 
7:40 ■ . _ . _ 
20840. 
19033 
1.735 
—.00237 
DATA NO. 8. 
TOTAL EPPICIENCY. 
From Data No. 2 — 
Amount of electrical work done 476575.2 joules 
From Data No. 4 — 
Total chemical heat 205560. calories 
Total chemical work • 861200. joules 
Total efficiency 55.34 per cent 
