a 
de daiaeaaca 
and Resistance of a Galvanic Circuit. 49 
intensity cannot possibly produce the maximum of polarization. 
Assuming therefore the intensities with 6, 8 and 10 cm. of pla- 
tinum wire too low, the mean value in column (a) would become 
yet smaller than 3-01, and the ratio of increase of resistance 
therefore greater than 1: 957, if not greater than - 975. 
this again holds good for the whole ratio of increas 
Considering all these circumstances, I think that ae air 
of the combined results, from table Vi, is not much at variance 
with the truth, and that my figures do not exaggerate the ‘facts 
in any high degree. 
here is an other point to be considered. The decrease of 
intensity with 6, 8 and 10 cm. of rheochord wire in the circuit 
amounts to a mean of 0:0018. When the circuit is closed di- 
rectly, this decrease of intensity, for about the same time, amounts 
to 0°1484, that is, to many times more than the difference of in- 
tensities amounts to. The intensity 15039 within the circuit 
closed directly, is the mean value of two pairs of observations, 
one for each end of the needle, being respectively 1°5845 and 
1:4233, with a decrease of 01612. This rapid decrease of inten- 
3 sity would justify starting the calculation of column (a) from 
neo 
pA 5°58, the ratio of increase being 1°993 against 1-975 
would become ei times greater than was resulting 
from the table. This increase, due to the greater direct inten- 
sf started from, exemplifies ‘however the intensive degree of 
influence of the intensity of the current upon the internal resist- 
ance, as i iy with the influence of the temperature of the 
unit of resistance 
which had been mi for but a very short time. The degree of — 
constancy of this battery may be judged from the fact that the — 
on needle was at 60°8° at the beginning of the experiments. 
at 602° one hour later, during which time the battery had 
use, except for very few minutes. Now, if I combine 
3 esti in w, 
| the hey aoe ee several great resistances in the circuit, and 
2 he 
three consecutive values, I Or a 15°65, 19°46, 
Am. JOUR. ie ue Srnizs, Vou. XLII, No. 197.—Jan. 
tf 
