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 57
d eitherby day or by night.A simple and effective way to signal in the daytime whenthe Sun is shining is by using a mirror, that is, a looking-glass,as it is commonly called. Every boy knows how to make flasheswith a mirror, so it will be enough to say here that the glassis held in the hand in such… … Fig. 37.—Boy Focusing Burning Glass onLeaves to Maeje Fire. THE SUN, BRIGHTEST OF ALL STARS 39
Astronomy · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
