Torsion Balance
Torsion Balance :
Also called a torsion pendulum, an instrument used to measure small forces. Invented by John Michell, it was used by Coulomb to establish the electrostatic force law and by Henry Cavendish to measure the Earth's density. The Cavendish balance is also used to measure the universal gravitational (fundamental) constant, G. The restoring torque that acts on the boom of the balance depends upon the shear modulus of the fiber that supports it. An instrument similar to the classic torsion balance is the Wood-Anderson seismometer
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