Abstract
A simple impulse-driven torsion pendulum for studying the transient and steady-state characteristics of resonant mechanical oscillators is described. The moving system has a natural period of about 2 sec and is fitted with a coaxial hollow cylinder and a reservoir of oil for applying a damping torque that is proportional to the angular velocity of the pendulum. This damping is continuously variable between almost zero (air) and critical. The driving impulses, which are approximately square waves, are derived from simple electronic circuits that permit the period between pulses to be continuously varied from approximately 0.05 to 4 sec. Detailed information on the mechanical system and electronic circuits is given.
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