385 
normal conditions = 0.28.10? eem. or ata pressure of p. mm of mercury. 
760 
— ,0,23.10-3 cm. gas. 
P 
According to the supposition the current is conveyed half by 
negative particles, half by positive particles. Hence taking into con- 
sideration what was assumed above 
760 
— .0,23.10—-3 ccm. 
ade 
is liberated on discharge per m.A. at tbe anode, and: 
760 
ae 0,23. 10-3. 4 ccm. of “neutral” gas 
p 
at the cathode. 
760 
Hence ae 0,23. 0-3 eem. more at the anode than at the cathode, 
P 
or when the strength of the current is A. milli-ampere: 
760 
yg lll Sd ee Ae hae AE) 
4p 
A stationary state will occur when through the diffusion an equal 
amount is carried back from anode to cathode. Let us think the 
current cut out for a moment with given difference of pressure 
and all the ions re-combined to neutral molecules. Then the gas 
must flow black through the capillary. Let us apply for this purpose 
formula (1), which under these circumstances ') passes into: 
JD 
9, — 38090 a Mee) ee Pr eae eee (5) 
When the stationary state prevails, we get’): 
A Cas 2,0,, 10—-4== 36090 ae 7 
don ek : ry ‘ 7 P/P i ; ( ) 
dD 
= 38090 . — . Ap, when p,—p, = Ap is put’). 
L 
Let the pressure of the gas be p = Bd = 0.15 mm. = 200 baryes, 
D=0.2 em, L = 5em. 
A = 400 mA., then: 
400 . 700 88090. 10-3 
lg ge Ape 
4. 0,15 5.200 
1) Assumed is 7'= 28008. (water-cooled capillary wall). 
2) pmm represent the pressure expressed in millimeters of mercury, pp that in bareys. 
3) A factor 1/pp has been added in the second member of this equation, because 
in equation 3 (resp. 6) qj (resp. dy) is measured by the product of volume and 
pressure (expressed in baryes), whereas from equation 5 a volume results at a 
pressure p, 
