TROWBRIDGE. 
IIIGn ELECTROMOTIVE FORCE. 
101 
It was noticeable that when a stratified discharge was established between A and 
B, there being no spark gap in the circuit except that of the rarefied space between A 
and B, fluctuating feeble discharges took place to earth through K. This phenomenon 
seems to indicate a discontinuity in the stratified discharge. 
When the small spark gap, either at the positive or negative pole, is of a suitable 
length, the discharges between either pole of the battery succeed each other so rapidly 
that the side discharges to earth appear continuous. If a lar_ r e condenser is substi- 
tuted for the earth at E, one plate of the condenser being connected to earth, the time 
between each discharge is lengthened. 
It is probable that in the case of lightning side discharges to the earth take place 
in the manner indicated by this method 
potential b 
the positively and 
natively charged clouds rising to a higher value than that between the 
th space beneath the clouds acting as a localized capacity. 
IXAME IONIZATION AND KLECTETCAL WIND. 
By the use of the wooden separators, as I have said, one can sh 
thout fear of permanent injury 
In doing this, several interesting phenomena ap- 
pear 
In a dark room a faint glow is alwav 
f 
d cells. This glow is independent of the position of the positive terminal, and 
idence of a silent discharge or ionization. On the other hand, a glow at the 
positive terminal does not appear (with a difference of potential of 20,000 
approaches to a distance of 17.5 cm. from th 
terminal, b 
After the positive terminal is brought to a distance of 4 
5 
nals being pointed. 
. from the negative terminal, — that is, to near the striking distance 
drawn away, the glow on the positive terminal persists to a greater d 
d 
d 
This is shown in the accompanying table 
First appearance of the glow on 
the positive terminal. 
17.5 cm. 
16 
17.5 
Glow can be drawn to 
20.5 cm. 
20 
20 
This phenomenon is analogous to the pers 
of 
II 
r* 
occurs when 
b 
distance and 
discharge which 
th on are drawn 
ap 
This flaring d 
.- 
extends to a distance of 60 cm. (with 40,000 volts). 
I then endeavored to see whether in an unsyinmetrical field 
find 
phe- 
o 
Faraday 
nds in the similar unsy 
