Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 123
caused by oxygen and water vapour, and are speciallyprominent when the Sun at the time of observationis low, so that its light has traversed a long path inthe Earths atmosphere. The Suns Surface.—To observe the Sun at the tele-scope precautions must be taken by suitable eye-piecesto cut down a… … TeJescope- 3 Diag. LV. of the Sun on a screen. This was the method adoptedby Carrington, who made an extensive series of ob-servations upon sun spots during the years 1853-61. Itis more usual now to photograph the Sun, enlargingthe image formed by the object glass by means of asecond lens. Besides…
Astronomy
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