細節
A fine galvanometer,
signed J. & A. Duboscq á Paris, No. 49, with oxidised and lacquered-brass fittings, finely balanced needle, the horizontal circle divided in four quadrants, with vulcanite vase, glass suspension tube and casing -- 9¼in. (23.5cm.) high
See Illustration
signed J. & A. Duboscq á Paris, No. 49, with oxidised and lacquered-brass fittings, finely balanced needle, the horizontal circle divided in four quadrants, with vulcanite vase, glass suspension tube and casing -- 9¼in. (23.5cm.) high
See Illustration