Elements of mechanics: treated by means of the differential and integral calculus (1887)
Peck, William G[uy], 1820-1892. [from old catalog] · New York, Chicago, A. S. Barnes & company · leaf 87
Let A be a sphere, supportedby a horizontal axis OP passingthrough its centre of gravity.Then, in whatever position it maybe placed, it will have no tendencyto change this position; it is, therefore, in indifferent, 01neutral equilibrium. In the figure, A, B, and C represent a cone in positionsof… … Fig. 49. If a wheel, or other solid, be mounted on a horizontal axis,about which it is free to turn, the centre of gravity not lyingon the axis, it will be in stable equilibrium, when the centre ofgravity is directly below the axis; and in unstable equi-librium when it is directly above the axis.…
Mechanics
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