Abstract
The ratio of light to dark resistance of a cadmium selenide photocell is sufficiently great for the cell to be used effectively as a light controlled switch. Where radiation incident on a detector is chopped at a frequency of less than 20 c/s, two such photocells can be used in a very simple arrangement to make a coherent demodulator which has the advantages of a mechanical rectifier without the usual disadvantages.
Published Version
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