The torsion balance consists of a bar suspended from its middle by a thin fiber.
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It also contained a detailed description of different forms of his torsion balance.
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Shows pictures of the Coulomb torsion balance, and describes Coulomb's contributions to torsion technology.
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Vertical section drawing of Cavendish's torsion balance instrument including the building in which it was housed.
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In Coulomb's experiment, the torsion balance was an insulating rod with a metal-coated ball attached to one end, suspended by a silk thread.
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It was not until 1784 when Charles-Augustin de Coulomb, using a torsion balance, was able to definitively show through experiment that this was true.
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Prior to his famous doctoral studies on magnetism, he designed and perfected an extremely sensitive torsion balance for measuring magnetic coefficients.
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The most important advance in experiments on gravitation and other delicate measurements was the introduction of the torsion balance by Michell and its use by Cavendish.
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Traditionally, various kinds of torsion balance have been used to calculate G by measuring the twist in a wire induced by the gravitational force between two masses.