Twaddell's hydrometer

Twaddell's hydrometer, in cardboard case, German, 1900-1910

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Twaddell's hydrometer, in cardboard case, German, 1900-1910
Science Museum Group

Twaddell's hydrometer, in cardboard case, German, 1900-1910

Details