The book of stars; being a simple explanation of the stars and their uses to boy life, written to conform to the tests of the Boy scouts (1915)
Collins, A. Frederick (Archie Frederick), 1869- · New York, D. Appleton and company · leaf 159
a largerGlasses. image is formed in the eye it is inverted, or upside down, so that this kind of a tele-scope is of no use as a glass to spy things with on the surfaceof the Earth. How to Make a Cheap Telescope.—Lenses are absurdlycheap. If you live in a large city you will find lens grinderswho… … -5JST- j:l % *\<v ILL. ^HEAVY PASTE BOARD THIN CARDBOARD Fig. 153.—Pasteboard Mounting of Lens. Get two pasteboard tubes of the kind described for thepinhole telescope; the bore, or hole, of the first tube should be1% inches in diameter and it should be 2 inches long. Havethe second tube a…
Astronomy · Stars
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