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Spring-activated pendular instrument whose beats can be synchronized with the tempo of a piece of music while practicing.
Mechanism that controls the spring release, thereby regulating the oscillations of the pendulum.
Counterbalance of the pendulum; its back and forth movement triggers a clacking sound.
Stem on which the wheels of the spring mechanism turn.
Adjustable weight that is moved along the pendulum bar to regulate the frequency of the beats.
Scale calibrated to a number of beats per minute (40 to 208) and used to match the tempo of a given piece of music (adagio, allegro, vivace and so forth).
Metal rod that oscillates from one side of an axis to the other to produce a sound signal.
Part that rewinds the mechanism, consisting of a series of wheels.