Now, if we construct three cells (or any
other number), so faced that the three, collectively, will be acted upon
by all the colors, and arrange them around the light to be tested, at
equal distances therefrom, each cell will produce a current corresponding
to the colored rays suited to it, and all together will produce a current
corresponding to all the rays emitted by the light, no matter what the
proportions of the different colors may be. The three currents may act
upon the same index, but each should have its own coil, not only for the
sake of being able to join or to isolate their influences upon the index,
but also to avoid the resistances of the other cells. If a solid
transparent conductor of electricity could be found which could be thick
enough for practical use and yet would transmit all the rays perfectly,
i.e., transmit white light unchanged, that would be still better. I have
not yet found a satisfactory conductor of that kind, but I think the plan
stated will answer the same purpose. This portion of my system I have not
practically tested, but it appears to me to give good promise of removing
the color stumbling-block, which has so long defied all efforts to remove
it, and I therefore offer it for your consideration.
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