Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 204
in stable equilibrium. A ball may rest in any position, as the centreof gravity is neither depressed nor raised by movement; but in the toy (Fig. 359) anymovement tends to raise the centre of gravity, and, on the cessation of the force, thebody returns to its original position. The ellipsoidal form… … Fig. 359. Fig. 360. Fig. 361. This is called unstable equilibrium, while in the position shown in Fig. 361 it is in stableequilibrium. In the toy (Fig. 362) the body of the figure* is light, and the weight of theballs brings the centre below the point of support. This will admit of great…
Mechanical drawing
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