Gravitational Attraction
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“Two cannon balls, when suspened by long cords, so as to hang quite near each other, are found to exert a mutual attaction, so that neither of the cords are excatly perpendicular, but they approach each other...” -Comstock 1850
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General PhysicsSource
J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 17
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