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The usefulness of the ordinary moving coil galvanometer is severely limited by the narrow range of adjustment of period, sensitivity, and damping ordinarily provided. By the use of an appropriate electrical circuit, these factors may be adjusted independently and through wide ranges plus or minus. Three separate rheostats control respectively: effective stiffness of suspension, effective damping and effective moment of inertia.
Otto H. Schmitt (Fri,) studied this question.