394 Prof. Skinner on the Relation of Electrode Fall 
same whatever be the gas-pressure and current-density under 
which it be obtained. 
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The Anode Fall.—In hydrogen and oxygen, as in nitrogen, 
the anode-fall for gas-pressures not lower than that giving 
an unstriated luminosity in the gas, is practically unaffected 
by changing the current-density. Harlier observations in 
nitrogen * indicated that the anode-fall increased with gas- 
pressure—tests being always confined to conditions giving an 
unstriated luminosity in the gas. Similar experiments per- 
formed in hydrogen and in oxygen, however, indicate the 
anode-fall to be constant with increasing gas-pressure. These 
latter observations, placing the former results from nitrogen 
in question, called forth in the present investigation a careful 
study of the anode-fall in this gas also. A notable difficulty 
in determining the anode-fall arises from the gas in the 
immediate vicinity of the anode possessing a potential gradient 
of negligible magnitude only at the lower pressures (ap- 
proaching that giving the striated discharge). The observed 
*Wied. Ann. J. ¢. 
