- The earths
**precessional**motion is of this latter type, the angles being ci = .0087, ~=23 28. - The polhode and herpoihode cones are then right circular, and the motion is
**precessional**according to the definition of 18. - We can hence deduce the condition of steady
**precessional**motion in a top. A solid of revolution is supposed to be free to turn about a fixed point 0 on its axis of symmetry, its masscentre G being in this axis at a distance h from 0. - If we put Oso we get the condition of steady
**precessional**motion in a form equivalent to (3). - The theory of disturbed
**precessional**motion there outlined does not give a convenient view of the oscillations of the axis about the vertical position.

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