174 
IOWA ACADEMY OP SCIENCE 
RECOVERY ON OPEN CIRCUIT. 
Time 
10:^ . 
W;59 . 
11;21 . 
31:34 . 
il:.53 . 
1*2:38 - 
i;3;3S . 
14:54 . 
10:1*3 - 
17:55 . 
.5:30 . 
11:30 . 
E. M. F. 
.3277 
.3918 
.4374 
.7485 
.7485 
1.0332 
1.3730 
1.4133 
1.4791 
1.5416 
1.7359 
1.7410 
Internal Resistance by condenser method 
Time ^ Int. Res. 
10:57 .275 
11:13 .174 
11:27 .0^ 
11:48 .195 
13:39 .202 
13:40 ^ .177 
14:55 .205 
16:15 .201 
16:15 .235 
8:30 .2605 
BATTERY ON CLOSED CIRCUIT. 
Time 
E. M. F. 
P. D. 
Current 
' 1 :-^ ... .. . 
1.7410 
.2354 
1.185 
n -.^5 _ 
.8786 
.1330 
1.137 
-- . . 
.3565 
.1070 
.694 
17:50 
>•00 . . 
.2730 
.1455 
.0351 
.0730 
.3010 
.0021 
7\'att Hours Complete 
Amount of work done in Joules 
132.382 
.476575.200 
DATA NO. 3. 
CHEMICAL DATA. 
Inner sol. 
Outer sol. 
Time 
HjSOj 
Zn 1 
HNO 3 
FE 2 (S 0)^3 
Spgr. 
H 2 SO 4 
Zn 
Spgr. 
.9:40 Wed 
8.241 
00.0 
358.1 
12.39 
1.3824 
316.09 
000.0 
1.1023 
Fri 
2.0 
353.7 
1.375 
280.09 
23.3 
1.1216 
15-49 — 
9.6 
105.0 
1.1555 
183.7 
87.3 
1.1634 
9:1 'MS 
21.7 
37.8 
1.1007 
102.59 
145.2 
1.203 
5^*40 
36.3 
12.6 
1.0947 
46.09 
159.6 
1.261 
v-4n 
2.06 
30.5 
4.^ 
1.0947 
26.39 
162.1 
1.280 
10:40 — 
1.13 
31.6 
.914 
— 
1.0951 
16.99 
162.9 
1.284 
DATA NO. 4. 
