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Displayed below are some selected recent viaLibri matches for books published in 1798

        Experiments to determine the Density of the Earth,

      Cavendish's celebrated paper calculating the weight of the earth using John Michell's torsion balance. PHOTOGRAPHS SENT ON REQUEST. First Edition, extracted from Philosophical Transactions of the Royal Society of London, vol. 88, 1798, pp. 469-526 and with 2 engraved folding plates. Small quarto, half calf gilt in period style, plates slightly foxed. "The apparatus consisted of two lead balls on either end of a suspended beam; these movable balls were attracted by a pair of stationary lead balls. Cavendish calculated the force of attraction between the balls from the observed period of oscillation of the balance and deduced the density of the earth from the force. He found it to be 5.48 times that of water. Cavendish was the first to observe gravitational motions induced by comparatively minute portions of ordinary matter. The attractions that he measured were unprecedentedly small, being only 1/500,000,000 times as great as the weight of the bodies. By weighing the world he rendered the law of gravitation complete. The law was no longer a proportionality statement but a quantitatively exact one; this was the most important addition to the science of gravitation since Newton." (D.S.B III:158). Norman 422.

      [Bookseller: Jeffrey Stern Antiquarian Bookseller]
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