A fine Helmholtz tangent galvanometer, with ivorine makers label inscribed ELLIOTT BROS LONDON, the two loops of braided copper wire encased in shellac and mounted in twin mahogany frames, the deflection needle mounted on cruciform bracing and raised on a pillar from the mahogany base, with copper and lacquered-brass fittings, on thin adjustable feet in original pine carrying case 19in. (48x3cm.) high