Hydrometer and metal case, French(?), 1830-1920 Hydrometer and metal case, French(?), 1830-1920 1830-1920
Hydrometer, Baume, glass, in metal case, probably French, 19th century Hydrometer, Baume, glass 1801-1900
Urinometer, mercury in glass, in cylindrical leather covered case, by Down Bros., London, English, 1874-1900 Urinometer, mercury in glass 1874-1900
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
Hydrometer, glass and metal, Twaddle, in metal case, European, 19th century Hydrometer, glass and metal 1801-1900