The Specification of a Spectral Correction Filter for Photometry with Emission Photocells

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Abstract
An aqueous soln. of cupric chloride, cobalt ammonium sulfate and potassium dichromate is a useful filter for modifying the spectral response of certain types of emission photocells, so as to match the response of the standard (photopic) eye. A table of spectral densities for these solutions permits calculation of the combination required for correction of a given photocell.