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The vibration galvanometer is used for detecting alternating currents in the frequency of its natural resonance.
The tuning of the vibration galvanometer is done by adjusting the tension of the suspension spring.
The sharp resonance of the vibration galvanometer makes it very sensitive to changes in the measured current frequency and it can be used as an accurate tuning device.
S. Butterworth (December 1911) "On the vibration galvanometer and its application to inductance bridges," Proceedings of the Physical Society of London, vol.
A vibration galvanometer is a type of mirror galvanometer, usually with a coil suspended in the gap of a magnet or with a permanent magnet suspended in the field of an electromagnet.