Twaddell's hydrometer
1900-1910
Twaddle Hydrometers
1950-1970
Hydrometer, glass, for diabetes
Hydrometer to measure sugar level
1870-1945
Hydrometer for use as diabetes-testing uriameter
1930-1960
Hydrometer, Sikes, brass
Hydrometer, plastic, for diabetes
Glass hydrometer
Glass hydrometers
1860-1900
Nicholson hydrometer in case with 2 thermometers
1850-1920
Brass hydrometer in mahogany case
1840-1920
Hydrometer, in case, French(?), 1801-1900
1801-1900
Glass hydrometer in case
Glass hydrometer
Hydrometer, brass, in wooden case
1801-1900
Hydrometer, Sikes, brass
1801-1900
Hydrometer, brass, in wood case
1801-1900
Clarke export hydrometer
1701-1800
Hydrometer, Sikes, brass
1801-1900
Hydrometer, Sikes, brass
1801-1900
Hydrometer, Sikes, brass
1801-1900
Hydrometer, brass, in wooden case
1801-1900
hydrometers
Hydrometer, brass, spherical front bulb
1860-1900
Baume hydrometer, glass, in case
3 diabetes hydrometers
1871-1930
Hydrometer, 1720-1980
1720-1820
Hydrometer and thermometer, Baume
Metal hydrometer
1720-1760
Glass hydrometer in case
Alcoholometer, Gay Lussac
1830-1920
Hydrometer, glass and metal
1801-1900
Hydrometer
Alcohol hydrometer
1701-1800
Broken glass and mercury hydrometer
1830-1920
Hydrometer, cased
Hydrometer, Bate, cased, English
Hydrometer, metal, in shaped wooden case
1801-1900
Hydrometer, glass, with colourless liquid
Glass Baume hydrometer
Glass Baume hydrometer
Clarke hydrometer in case with collars and weights
1840-1920
Two hygrometers in a wooden case
Brass Baume hydrometer, French(?), 1830-1920
Clear glass hydrometer
1880-1920
Glass Hydrometer, Beaume No. 1, 1866-1876
1866-1876
Silver ureometer
1870-1910
Clarke's Alcohol Hydrometer, 1767-1800
1804-1844
Hydrometer for use as diabetes-testing uriameter
1930-1960
Hydrometer for use as diabetes-testing uriameter
1945-1950