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 96
Fig. 85.—Lines of Forcethrough and around aMagnet. MOTHER EARTH, OLD ADAMS PLANET 77 n.M/O-, … forming a magnetic circuit, just as two wires joined to-gether may form an electric circuit. If we place a compass needle near the steel bar magnet the needle will turn in the same direction as the magnetic lines of force are flowing, and it will, there-fore, point to the north and to the south…
Astronomy · Stars
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