Photo-electric measurements of daylight
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W. R. G. Atkins; Miriam Rothschild
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Article
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2007
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John Wiley and Sons
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English
β 601 KB
## Abstract Observations have been made with vacuum sodium and with rectifier selenium photoβelectric cells, under opal flashed glass diffusing plates. The former may remain constant save when exposed to intense tropical desert heat and full sunshine for a long period. The latter are far less const