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"DICO" Ballistic Galvanometer. A ballistic galvanometer is a type of sensitive galvanometer; commonly a mirror galvanometer. Unlike a current-measuring galvanometer, the moving part has a large moment of inertia, thus giving it a long oscillation period. It is really an integrator measuring the quantity of charge discharged through it. These galvanometers are rigid in construction beautiful in design and easy to operate, with large periodic time. Large moment of Inertia of the moving part of the galvanometer. Deflection closely proportional to the electric charge? Ballistic Galvanometers undergo strict laboratory checks before dispatch and are suitable for direct deflection measurements which are closely proportional to the current. These galvanometers can be used both PERIODIC as well as APERIODIC instruments. An arrangement is provided to make it APERIODIC by introducing a suitable resistance in parallel with the moving coil system. Zero adjusting and locking devices are provided. The Phosphor-bronze suspension strip prevents the shifting of zero. The moving coil carries a specially polished front silvering concave mirror of 100cm. focal length, suitable for use with Lamp and Scale Arrangement. Galvanometer Resistance 500 ohms and Time period Approximate 10-12 Seconds.?