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 158
in the cardboard disk % inch in diameter andcover this hole with a bit of tinfoil. Now make a hole in thecenter of the tinfoil with the point of a needle; this makesthe edge of the hole sharp. A pasteboard tube without the pinhole will also aid thenaked eye in seeing the Moon and stars, for it… … Fig. 151.—The Telescope (Galileo). Haw a Telescope Works.—A real telescope has at leasttwo lenses in it; the larger lens is placed in the end of the tubenearest the object to be viewed and is called the object glassbecause the light from the object is received by it. The smaller lens is placed in…
Astronomy · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-376-43.webp)
