This small scale version of the famous Cavendish experiment verifies Newton’s Law of Gravity and measures the Universal Gravitational Constant using two methods—initial acceleration and equilibrium displacement.
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Unique, small scale version of the famous Cavendish experiment used to verify Newton’s Law of Gravity and measure the Universal Gravitational Constant, g, using two methods—initial acceleration and equilibrium displacement. This device is remarkable for measuring the value of g by simple, easily-understood means. Apparatus contains a torsion pendulum system carrying a small mirror for optical measurements, a light damping vane and a light aluminum cross-piece with two 20-g lead balls 10 cm apart. The suspension wire is a very fine beryllium bronze torsion wire 15 cm long. This configuration gives the pendulum a torsional period of 590 ±10 seconds. The pendulum is mounted in a massive aluminum housing with glass windows to minimize drafts. Two large 1.5-kg plastic-coated lead balls rest on the light aluminum cylinders on a swivel that enables them to be swung from one side to the other of the apparatus. Dampening oil is included. Overall dimensions are 30 × 30 × 42 cm and weighs 1.2 kg.