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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 154

An illustration from 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, leaf 154
LENS EDGE OF SIDE VIEW OF CONVEX LENS CONVEX LENS Fig. 146.—Convex Lens. FOCUS it is at the edge, as shown in Fig. 147. It is used in small tele-scopes and opera glasses to turn the inverted picture formed SEEING THE STARS 135 … EDGE OPCONCAVE LENS SIDE VIEW OFCONCAVE LEvNS by the convex lens around so that the object can be seen in itsright position, as shown in Fig. 151. Shadows.—Shadows are useful as well as sunshine, butshadows are such common, everyday things it seems almost use-less to talk about them; still you may…

Astronomy · Stars

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