Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 83
put theball in motion, it was drawnaside by a cotton cord andleft for some hours, untilit came absolutely to rest.Then the cord was burnedoff, and the pendulum startedto swing in a true plane. But this plane at once be-gan to deviate slowly towardsthe right, so that the pin onthe pendulum ball cut… … Fig. 9. —Foucaults Pendulum Experiment. and visibly turning under the plane defined by the swingingof the pendulum. The experiment created great enthusiasm at the time, and has sincebeen frequently performed. The pendulum used in such experimentsmust, in order to secure success, have a round ball,…
Astronomy
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