Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 154
116 ANNALS OF THE ASTRO PHYSICAL OBSERVATORY straight line E drawn there. This we regard as the line of “normal pyranometry ” for air mass 2.0. A departure of any observed value from the indication of the line of normal pyranometry we term the “excess. ” It may have any value from — 60 to + 150 or… … Our next care was to discover the march of atmospheric transmission coefficients at selected places in the spectrum on days of normal pyranometry. The transparency decreases with increasing values of the precipitable water. We selected all available long-method days of satisfactory character for…
Infrared spectra · Solar radiation
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