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open hydrometer (?)
open hydrometer (?)

open hydrometer (?)

Date1879-1930
Inventory Number4338
ClassificationHydrometer
Subject
    Maker Dr. H. Geissler, Nachfolger Franz Müller fl. 1879 - 1920s
    Cultural Region
      Place of Origin
        Dimensions38.4 x 7.5 cm (15 1/8 x 2 15/16 in.)
        Material
          DescriptionA glass tube consisting of a thin, long stem with a cylindrical bulb at one end. At the opposite end, the glass bulb expands to a heart-shaped hollow chamber with a short narrow neck on top with a ground rim.

          The long stem of the tube is marked with a scale that goes from 20 to 22,5 increasing upwards. It has markings every 0.02 units and numbers every 0.2 units.


          SignedAlong neck, near scale: Dr. H. Geissler Nachf Frz. Müller in Bonn.
          FunctionThis is most likely a hydrometer for determining the density of liquids that are lighter than water. Unlike most hydrometers, it is open at the top. It apparently has a Baume scale that translates to densities between 0.918 and 0.933. One would need to fill it with a liquid (mercury?) before its use.
          open hydrometer (?)
          open hydrometer (?)
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1879-1930
          Object number: 4339
          glass hydrometer
          glass hydrometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1900-1920
          Accessories: green cylindrical cardboard case
          Object number: 4446
          glass hydrometer
          glass hydrometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1900-1920
          Accessories: blue cylindrical cardboard case
          Object number: 4447
          glass hydrometer
          glass hydrometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: green cardboard case
          Object number: 4445
          discontinuous milk glass scale thermometer
          discontinuous milk glass scale thermometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: hinged black case with violet velvet lining
          Object number: 4428
          milk glass scale thermometer
          milk glass scale thermometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: wooden cylindrical case
          Object number: 4975
          thermometer (Beckmann?)
          thermometer (Beckmann?)
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: black cardboard case with green inner surface
          Object number: 4399
          thermometer (Beckmann?)
          thermometer (Beckmann?)
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1910
          Accessories: green cardboard case
          Object number: 4389
          thermometer (Beckmann?)
          thermometer (Beckmann?)
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: black cardboard case with red inner surface
          Object number: 4397
          thermometer
          thermometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: brass cap with knob at top; black cardboard case with red inner surface
          Object number: 4400
          thermometer (Beckmann?)
          thermometer (Beckmann?)
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: black cardboard case with marbled paper inner surface
          Object number: 4407
          thermometer
          thermometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: wooden case
          Object number: 4411