Abstract
The principle and operation of a photometer using photoconductive (cadmium sulphide) cells are described. Some limitations of the instrument were detected and these are discussed in relation to the photoconductivity of CdS cells. Some inherent characteristics of the dynamic equilibrium of a CdS cell, which apply under all conditions, make it difficult to keep this type of photometer in calibration. Suggestions are outlined to help users to overcome these difficulties, and modifications are proposed for future designs.
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