Inside Out Library

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 162

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 162 — five plano-convex lenses in it and these not only magnify the image butthey also erect it so that you see the object as it really is. While the homemade telescopes which I have described willnot magnify as highly as a cheap telescope which you can buy,yet you ought to make one, for it will let you… … A 8 Fig. 157.—Magnifying Power of Telescope. To Find the Power of a Telescope.—In the last chapter, Iexplained what the focal length of a convex lens is, see Fig. 146,and how to measure it. To repeat, it is the distance in inchesbetween the center of a lens and the point where the rays…

Astronomy · Stars

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

More pictures 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

More like this