Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 113
in 1851 by theFrench physicistFoucault. It de-pends upon thefact that accord-ing to the laws ofmotion a freelyswinging pendu-lum tends con-stantly to move inthe same plane.Suppose a pendulum suspended at 0, Fig. 28, is startedswinging in the meridian OQ. Let OF be the tangent at 0drawn in the plane… … Fig. 28. — The Foucault pendulum. CH. Ill, 44] THE MOTIONS OF THE EARTH 85 The tangent to the meridian at 0 is OF. Consequently,the angle between this line and the plane in which thependulum will be swinging is VOV, which equals OVO.That is, the angle at V between the meridian tangents equalsthe…
Astronomy
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