ELECTRIC DISCHARGE WITH THE CHLORIDE OF SILVER BATTERY. 
213 . 
was reduced to 27, and just before the current ceased to pass after the 
battery had been disconnected from the condenser the number fell to 21. 
In the case of tube 124 the strata decreased in number with the decrease 
of current. 
The introduction of any substance in the tube, such as rings or flags of metal, 
produces an interruption of strata very much as if they acted as distinct terminals. 
Tube 120, Carbonic Acid. 
209. — This tube is 28 inches long between the end straight terminals, and 1'75 
inch diameter, with two lightly suspended aluminium flags. Nine strata 
produced from the positive, then a dark space between them and the first 
flag, which is brightly illuminated. This seemed to act as a fresh terminal, 
from which started ten strata, beyond which there was again a dark space 
between them and the second flag, which in its turn appeared to act as a 
new terminal, being illuminated by a glow.' 5 ' Five other strata were formed 
on the other side of this, and beyond them there was a dark space, and 
the negative terminal was brilliantly illuminated. Fig. 5, Plate 17, copied 
from a photograph shows the phenomena ; no motion of the flags could be 
detected during the passage of the current, 0 '01 158 W. 
Tube 101, Carbonic Acid. 
210. — This tube is 25 inches long between two straight terminals, and 1*5 inch 
in diameter ; beginning at the positive terminal on the right, at 1'25 inch is 
a fixed flag 0'5 inch square, beyond this at 1'5 inch another, at the middle 
of the tube a ring 1 inch in diameter ; on either side of this ring at 
1'375 inch distance are two balls about 0’375 inch in diameter, then two 
other square fixed flags at the same distances from the left hand (negative) 
terminal and from each other. It will be seen by referring to fig. 6, Plate 17, 
that a close stratified discharge is shown with an illumination of each of 
the impediments except the last two flags near the negative, as in tubes 
referred to at page 165. This figure is copied from a photograph taken 
when the tube was connected with 2400 cells and 150,000 ohms resistance, 
C. 0-00504 W. 
* Gaggain (‘ Comptes Rendus,’ xli., 1855, pp. 152-156) compares the behaviour of gases in this respect 
with that of liquid electrolytes where the introduction of a metal diaphragm between the electrodes 
increases the resistance,, and the two faces of the diaphragm act as opposite electrodes. GauGAIN 
further remarks that if the metal obstruction be pierced it ceases to act as a double electrode in gases, a 
fact confirmed by our many experiments with tubes furnished with metal rings (fig. 41, p. 165). 
