D. Boboulieff—Dissipation of Electricity in Gases. 125 
square millimeter of the surface, then we will be able to write 
formula (8) in the following form: 
pre R'  gi60(1+at) , _ 
u—U, =—+487 . sae TF % : Seca tt 
C, 6. 
4 3 
+1 1429270002". ¢ : } 760(1 at) 5 
cis Or ee dui 
To show how insignificant is the second part of this equation, 
we will make the following disadvantageous suppositions: 
eh a fe pe ass 
7 =75 3 P=]ps3 Where fe 10"? ¢=Rh; 
and lastly, if for simplicity we put t=0, H=760™", d=1, for 
which there results* w=485 x 10° millimeters, we obtain 
mee ‘(1 A’n ot 
wou, (i+ R ‘i0* 
A’n 3) 
or _ ion & 
usu, (1 Rio 
If we put R=10™, A=108, n=10°, which correspond well to a 
very strong tension of the electricity+ and to a length of the 
path vl of six millimeters, we then obtain 
=I 40°00155. 
This change in the velocities will correspond to a change in the 
temperature of 0°-8 C. It follows that during the first moments 
there will fall on the surface of the electrified body— : 
uch atoms as would fall on it in case it were not electri- 
ars and in consequence of gravity alone. 
3. Such as may from greater or less distances accidentally 
r the first moment, during which the falling atoms 
become electrized, they retire from the surface of the body and 
* Clausins, Abhandlungen, II, p. 255. - 
+ Compare Weber and <aoens: Maassbestimmungen, Zuriickfihrung der 
tensitats Messungen auf Mechanisches Maass., p. 263. 
