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 78
just as securely asthe stone is held out by theforce the boy exerts to moveit, and in by the string he holds in his hand. This balancing of opposed forces was nicely shown someyears ago by Sir Robert Ball, the great English astronomer, atone of his lectures in the Eoyal Institution of London, and… … Fig. 65. — Iron Ball PendulumSwinging in Straight Line. 60 THE BOOK OF THE STARS pendulum, forth and back, in a straight line, as shown inFig. 65. But when a powerful magnet was placed on the table andthe ball was set swinging in a straight line as before, just as itcame close to the end of the…
Astronomy · Stars
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