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Invented by English geologist John Mitchell, it usually involves two small spheres attached to the ends of a horizontal rod which is suspended by a wire. Among those who have used this device is Charles Augustin de Coulomb in studying electrical and magnetic attraction. _FOR 10 POINTS_ —name this apparatus which Henry Cavendish used to measure the gravitational constant, G.
Invented by English geologist John Mitchell, it usually involves two small spheres attached to the ends of a horizontal rod which is suspended by a wire.
{torsion balance}