[5] My
standard size of cell has about two by two and a half inches of surface,
with a thickness of 1/1000 to 5/1000 inch of selenium. But the cells can,
of course, be made of any size or form. A great advantage of this
arrangement consists in the fact that it enables me to apply the current
and the light to the selenium in the same plane or general direction,
instead of transversely to each other as heretofore done, so that I can
cause the two influences to either coincide in direction and action, or
to act upon opposite faces of the selenium and oppose each other,
according to the effect desired.
[Footnote 5: The method of constructing the cells was described in the
SCIENTIFIC AMERICAN SUPPLEMENT, No. 462, for Nov. 8, 1884, page 7371.]
By virtue of the process and arrangement described, my cells have a
number of remarkable properties, among which are the following:
1. _Their sensitiveness to light_ is much greater than ever before known.
The most sensitive cell ever produced, previous to my investigations, was
one made by Dr. Werner Siemens, which was 14.8 times as conductive in
sunlight as in dark. In table A, I give results obtained from a number of
my cells.
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