Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 192
is theatre, and attachedto its lower end is an iron ball, made hollow for thesake of lightness. When I draw the ball aside, it swings The Inner Planets. 177 to anl fro with the regularity of a great pendulum. Butwhen I place a powerful magnet in its neighbourhood (Fig.58), you see that as soon as… … Fie. 58.— The Effect of Attraction. move in a straight line were it not for the attraction of the sun which draws the body aside. THE GEOGRAPHY OF MARS. It remains to say something with respect to thegeography of our fellow-planet, a subject which seems allthe more interesting because Mars is so…
Astronomy
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