A Good Lord Kelvin Multicellular Voltmeter

English, c.1910, engraved to the solvered plaque at the top 'Lord Kelvin's Patents, Multicellular Voltmeter No.1506, James White Glasgow', the galvanometer with a glass oil damper (empty) to the base, needle to a scale running 0-260, in a chased lacquered brass case mounted on a later wooden support, 42cm tall