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 252
escope lens of long focus. We formby means of it an image of the sun of an inch or so indiameter, and place the slit of our spectroscope succes-sively on various parts of that image. It was to be expected that some very important addi-tional information would thus be obtained. Now, suchinformation… … absorption lines a little thicker and darker than fromsunlight as a whole, so that it appears that there isassociated with the sun-spot something which producesan excess of absorption. There is a more powerfullyabsorbing medium at the place where the sun-spotappears than at the places where faculae…
Force and energy · Matter · Heat · Spectrum analysis
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