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The standardization of daylight measurements

✍ Scribed by R. H. Collingbourne; P. Petherbridge; G. Spurr

Publisher
John Wiley and Sons
Year
1961
Tongue
English
Weight
104 KB
Volume
87
Category
Article
ISSN
0035-9009

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## Abstract Observations have been made with vacuum sodium and with rectifier selenium photo‐electric 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