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open hydrometer (?)
open hydrometer (?)

open hydrometer (?)

Date1879-1930
Inventory Number4339
ClassificationGlassware
Subject
    Maker Dr. H. Geissler, Nachfolger Franz Müller fl. 1879 - 1920s
    Cultural Region
      Place of Origin
        Dimensions38.5 x 7.5 x 7.5 cm (15 3/16 x 2 15/16 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 22.4 increasing upwards. It has markings every 0.02 units and numbers every 0.2 units.

          Its top neck is stopped with cotton.
          SignedAlong neck, near scale, "Dr. H. Geissler Nachf Frz. Müller in Bonn."
          Inscribedscale from 20-22.4
          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 0.9186 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: 4338
          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
          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
          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
          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
          thermometer
          Dr. H. Geissler, Nachfolger Franz Müller
          Date: 1890-1920
          Accessories: wooden case
          Object number: 4411