Abstract
By employing an Einthoven or string galvanometer rather than the usual D'Arsonval galvanometer in a direct-writing oscillograph a considerable reduction in inertia of the moving element is obtained. The use of compliant end supports makes possible very large deflections so that a 10-cm long string having a resonant frequency of 230 cps can be made to move through an amplitude of 2.5 cm. The nonlinearity associated with the large amplitude can be corrected by shaping of the magnetic field, and electromagnetic damping of the order of critical or less is obtainable.
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