Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 80
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 Royal Institution of London, and… … Fig. 65. — Iron Ball PendulumSwinging in Straight Line. 60 THE BOOK OF THE STARS pendulum, forth and back, in a plane, as shown in Fig. 65. But when a powerful magnet was placed on the table andthe ball was set swinging in a plane as before, just as itcame close to the end of the magnet the latter…
Astronomy · Stars
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