e., the surface next to
the gold offers a higher resistance to a battery current than the other
surface of the selenium does. The power to generate a current is
temporarily weakened by sending a battery current through the cell while
exposed to light, in either direction. The current generated by exposure
to light is also weakened by warming the cell, unless the cell is
arranged for producing current by exposure to heat.
The properties of sensitiveness to light and to change of battery power
are independent of each other, as I have cells which are sensitive to
change of current but absolutely insensitive to light--their resistance
remaining exactly the same whether the cells are in darkness or in
sunlight. I also have cells which are sensitive to light, but are
unaffected by change of battery power, or by reversing the direction of
the current through them.
The sensitiveness to change of battery power is also independent of the
sensitiveness to reversal of direction of the current. Among the best "L
B cells," some are "anode cells" and others are "cathode cells," while
still others are absolutely insensitive to reversal of current or to the
action of light.
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