384 H. Haug on the Electro-motive Force 
ters of platinum wire. Now the first circumstance, the general 
case. The errors of observation may hide the normal increase, 
and may have led to the trifling with the matter, as generally 
observed. 
’ Examining more closely some reports of other experimenters 
I was indeed able to trace the general increase of the constants 
of a galvanic battery with the decrease of the observed intensi- 
jess: TF . Miiller records the following results of observa- 
tions with six cells of Daniell’s construction. The resistance is 
exp in meters of copper wire. 
Internal resistances 
No. of - . Mean values « 
battery. for Meters of copper wire introduced into the circuit. of them. 
& 19 40 70 100 
he 2°85 2°85 3°20 * ‘pant cin 2:97 
2. 341 8°35 3°55 Pee tic 3°44 
. 3-02 3-05 3°23 PEERS Ogee Fae 3°10 
4, 319 3:19 3°55 pis hark pag 3°25 
5. 3:08 3138 3°40 eat rare 3°21 
&. 3°68 864 3°57 wise ae 3°63 
20°6 
Bat. of 6 cells, 18-20 19-03 18°01 2G wees 18°31 
18-56 18:38 18-47 
I think nobody can overlook the general increase of the inter- 
nal resistance of every cell, except No. 6, with the increase 0 
the external resistance, or with the decrease of the observed in- 
tensity. The sum of the mean resistances of all the six cells is 
20°6, while the battery of all the six cells combined actually 
id net have more than 18°81, as calculated from the corres- 
ponding first three observations with 5, respectively 10, and 40 
meters r wire in the circuit. Thus the internal resist- 
gre 
from these figures that they are equal, to his satisfaction. But 
whatever the reason of this real increase of the galvanic con- 
dertook other series of experiments, the results of which are 
