A "Searle's" torsion balance; a mahogany and brass tangent galvanometer;and a collection of other scientific apparatus including a spectrometer by W.& J. George Ltd, with helical scale, black enamelled and lacquered brass - 7¾in high

細節
A "Searle's" torsion balance; a mahogany and brass tangent galvanometer;and a collection of other scientific apparatus including a spectrometer by W.& J. George Ltd, with helical scale, black enamelled and lacquered brass - 7¾in high