DR. CHREE has obligingly sent me a copy of his paper entitled “The Relationship between the Solar Constant and Terrestrial Magnetism” (Proc. Roy. Soc. A 109, 1925). He finds no indication in the solar ...
NEARLY a century ago three pioneers, Sir John Herschel, Pouillet, and Forbes, laid the foundations of the measurement of solar radiation. Each devised an instrument for measuring the heating effect of ...
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