Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 459
D PRESENT. [nnriK VI. hydrogen lines are seen to start up to great heights,showing the presence of flames or prominences extend-in o; in heioht to sometimes 100,000 miles. If, without changing the focus, we open the slit wider,and throw the suns image just off the slit, so that thevery bright… … Fio. 201.—Part of Solar Spectnim near F. the slit, so if we virtually remove the slit by opening itwide, we see the flames ; still the limit of opening issoon approached, and the flood of atmospheric light soonmasks them. The red hydrogen line of the spectrumis the best for viewing them, although…
Astronomy · Telescopes
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