Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 48
ture of the sun appears to be. If you get a piece of very dark glass, or if you smoke apiece of glass over a candle, then you can look directly atthe sun with comfort. A nicer plan is to prick a pinhole in The Sun. ^ a card, through which you can look at the sun without anyinconvenience. Generally… … Fig. 13.—This is what the Sun sometimes looks like. The correct way of doing this is shown in the oppositepicture, Fig. 12. A small telescope, fixed on a stand, ispointed to the sun, and on a screen the sun draws its ownpicture. This may be examined without any inconvenience,or without the…
Astronomy
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