The construction of micro-galvanometer systems of short period (0.01 sec.) and low resistance (20Ω, 0.3 to 0.5 mm. wide, weighing 3-5 mg., is described; methods of winding and inserting connecting tags in the form of a loop and of removing surplus insulation to reduce the inertia of the coil are given. A static balance of the system is undertaken by bending the tags and adding small weights to the coil. These weights are placed close to the axis in order to obtain good dynamic results.
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A C Downing (1948) studied this question.