Star-land; being talks with young people about the wonders of the heavens (1899)
Ball, Robert Stawell, Sir, 1840- [from old catalog] · Boston and London, Ginn & company · leaf 47
u can look at thesun without any inconvenience. Generally speaking, aview of the sun in this way will show you only a uni-formly bright surface. To study the face of our greatluminary carefully, you must use the aid which thetelescope gives to the astronomer. A very good way ofdoing this is shown… … Fig. 12. — Looking at the Sun. picture on a screen. This may be examined withoutany inconvenience, or without the necessity for anyprotection to the eye, and a number of young astron-omers can all view the sun at the same moment. Onsuch a picture you will generally see the brilliant sur-face marked…
Astronomy
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