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Published online by Cambridge University Press: 15 September 2014
1. Let α be the vector (from the earth's centre) of the point of suspension, λ its inclination to the plane of the equator, α the earth's radius drawn to that point; and let the unit vectors i, j, k be fixed in space, so that i is parallel to the earth's axis of rotation; then, if ω be the angular velocity of that rotation