Hydrometer, Baume, glass, in metal case, probably French, 19th century Hydrometer, Baume, glass 1801-1900
Hydrometer and metal case, French(?), 1830-1920 Hydrometer and metal case, French(?), 1830-1920 1830-1920
Glass and mercury hydrometer, with case, made by Thomas O. Blake, 58 Hatton Garden, London, EC, England, 1830-1920. Glass and mercury hydrometer 1830-1920