38 Resistance by Fluids to Electric Conduction. 
wire observed which must be taken out of the circuit, to bring 
the needle to its first position. It is obvious that the increase of 
the fluid mass occasioned precisely the same resistance as the 
unwound German silver wire, and this, entirely independent of 
the — of polarization. 
ollowing numbers are the average of at least three, but 
Saeaiiy of a larger number of nearly coinciding observations. | 
At first it appeared to me of importance to ascertain approxima- 
tively the Nene of the intensity of the current upon the con- 
ducting power. T'o this end the trough was filled to 0-0275 
millimeter wih diluted sulphuric acid of 1:10 spec. grav. I ob- 
tained by— 
Variation of the needle. 
Fo 
] Resistance in Bat of beat silver | 
For the first 2° = 4 the Talia zi 5 cent. 
Lo? 32°44 20:67 by 
20 20°30 21°25 
30 10°74 20°00 
The resistance of the first 2-5 cent. liquid, which embraces the 
influence of polarization, shows it to be variable with the strength 
of the current, while, as soon as this influence becomes eliminated, 
: : a 
Similar experiments with other liquids, as chlorid of sodium, sul- 
phate of copper and others, gave ys apie! the same result. It ap- 
ed to me therefore, sufficient to ascertain with the grea 
ace curacy, the resistance of the iabee of these liquids, only for one 
intensity of the electric current. In order, then, to oppose the 
variability occasioned by polarization in the course of a series of 
experiments, this was maintained with the greatest care. In 
the following statements of the length of the layer of liquid, the 
first 2-5 cent. which includes the resistance of the polanaaheuae 
withdrawn. 
It is assumed that the resistance presented by fluids is, as is the 
case with solid conductors, directly as the length and In versehy-gs 
the section. My experiments confirm the assumption. 
I content myself with the presentation of only a single series 
of experiments, which were made with the sulphuric acid of - 
previous experiment. 
—_———_ ee ; 
4 Length of layer of Finid. Resistance in ‘windings of Ger 4 
Centimeter, Observed. ci Ceaitade Se Ries ae 5 cen 
Nila 4:134. 
4300 
4654 
4250 
"220 
Medium value, 4°311 | 
~The trough was filled with acid to a depth of 0-0275 meter. 
As the « epth vs fluid was here increased to 0-048 meter; the re- 
sistanee for 5- cent. length was equal to nae: windings. | 
0:0275 : 0-048 nearly as 2°56 : 4-311. : 
