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It is well known (see Thomson and Tait, §§ 517, 518) that a spherical shell, whose surface-density is inversely as the cube of the distance from an external point, as well as a solid sphere whose density is inversely as the fifth power of the distance from an external point, are centrobaric. The centre of gravity is, in each case, the “image“ of the external point.
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- Copyright © Edinburgh Mathematical Society 1892