386 Distribution of Electricity in Electrolytes. 
of the electrifications &c. registered on silver plates placed 
along the axes of tubes of copper gauze of different diameters. 
The tubes were each 100 millim. long, and the silver plates 
120 x 7 millim. wide, projecting, as in the last experiment 
with the silver tube, 10 millim. beyond their respective ends. 
The electrifications &c. on a silver plate of the dimensions 
given, but without the metallic surroundings, were found to 
measure 38 millim. — , 15 intermedial space, and 67 +. The 
numbers in the fifth column express the power exercised by 
the several tubes in protecting the partially enclosed plates 
from electrification, and were found by subtracting the inter- 
medial space left on an unprotected plate (15 millim. as given 
above) from the intermedial space obtained in the several ex- 
periments, as given in the third column of the Table. 
Diameter of 
tube. 
— electrifica- 
tion. 
Intermedial 
space. 
+ electrifica- 
tion. 
Protecting- 
power. 
10 millim. ... 
7 
97 
16 
82 
20 „ ... 
9 
91 
20 
76 
40 „ ... 
12 
83 
25 
68 
It was of course to be foreseen that, as the diameter of the 
tubes increased the power to protect from electrification the 
part of the conductor within them would decrease. These 
results show, moreover, that in the experiment with the small- 
est tube its negatively-charged end cut off, so to speak, the 
electrification of the same sign on the plate 3 millim. from 
the mouth of the tube ; and that in the third experiment the 
— electrification on the plate passed only 2 millim. within 
a tube of 40 millim. diameter. In connection with this, which 
may prove to be decisive evidence of a repulsive action, I 
would point to the different magnitudes of the electrifications 
(especially the — ) on the plate in the fourth experiment with 
the silver tube (page 385) and on the plate in the experiment 
with the smallest tube of gauze respectively. In the former 
of these experiments the — electrification on the plate mea- 
sured 11 millim., while in the latter the same electrification 
measured only 7 millim., the only difference in the two expe- 
riments being in the material and structure of the tubes. 
October 1883, 
