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The Cavendish experiment can be demonstrated by an apparatus consisting of two pairs of spheres, each pair forming dumbbells that have a common swivel axis. One dumbbell is suspended from a quartz fibre and is free to rotate by twisting the fibre; the amount of twist measured by the position of a reflected light spot from a mirror attached to the fibre. The second dumbbell can be swivelled so that each of its spheres is in close proximity to one of the spheres of the other dumbbell. The gravitational attraction between two sets of spheres twists the fibre, and it is the measure of this twist that allows the magnitude of the gravitational force to be calculated.
