This device is used to determine the acceleration due to gravity at a place. It consists of a uniform rectangular bar, some one meter long, with some equidistant holes drilled on it. It is suspended by a parallel knife edge passing through any of these holes. A vertical pointer is arranged in front of the pendulum to mark its exact equilibrium position. The pendulum is then made to oscillate. The oscillations should be of small amplitudes in a perfectly vertical plane. From the time for some limited number of oscillations, we can determine the acceleration due to gravity at one location.
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