Star-land; being talks with young people about the wonders of the heavens (1899)
Ball, Robert Stawell, Sir, 1840- [from old catalog] · Boston and London, Ginn & company · leaf 201
re is a long wiresuspended from the roof of this theatre, and attachedto its lower end is an iron ball, made hollow for thesake of lightness. When I draw the ball aside, itswings to and fro with the regularity of a great pen-dulum. But when I place a powerful magnet in itsneighborhood (Fig. 59),… … Fig. :»«.). The Effect of Attraction earth, or any other planet, which would move in a straight line were it not for the attraction of the sun which draws the body aside. THE GEOGRAPHY OF MARS. We will now say something with respect to fchegeography of our fellow-planet, a subject which seems all…
Astronomy
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