Lectures on some recent advances in physical science with a special lecture on force (1876)
Tait, Peter Guthrie, 1831-1901 · London, Macmillan and co. · leaf 259
gher temperature than the star itself. Now,this leads me to another and a curious remark aboutthe lines of hydrogen which we see in the sun. Hereis a portion of the solar spectrum as seen under par-ticular conditions. It belongs to a solar spot wherethe amount of radiation is less than that from… … was capable of radiating more of the hydrogen lightthan there was to absorb, so it behaved as a radiatingmedium instead of an absorbing one; and thereforethe green line in the solar spectrum which is due tohydrogen came out as a bright line. After watchingthis phenomenon for a short time in this…
Force and energy · Matter · Heat · Spectrum analysis
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