Principle and Working:
In this set-up, the angular acceleration of abeam containing two small lead balls is measured by an interface system that contains an integrated capacitive sensor. This angular deflection results from the gravitational attraction of two large lead balls held on a swivel arm on to the small lead balls on the beam. The beam containing the two small lead balls is held suspended by a thin tungsten thread. So when the larger balls are brought near to the smaller balls, the tungsten thread oscillates about its equilibrium position due to the restoring moment of rotation generated in the thread.