glass hydrometer
Date1890-1920
Inventory Number4445
ClassificationHydrometer
Subject
Maker
Dr. H. Geissler, Nachfolger Franz Müller
fl. 1879 - 1920s
Owner
Theodore William Richards
1868 - 1928
Cultural Region
Place of Origin
Dimensions17.2 x 1.6 cm (6 3/4 x 5/8 in.)
case: 1.9 x 19.5 x 1.9 cm (3/4 x 7 11/16 x 3/4 in.)
case: 1.9 x 19.5 x 1.9 cm (3/4 x 7 11/16 x 3/4 in.)
Material
Accessoriesgreen cardboard case
DescriptionA hydrometer consisting of a thin glass stem that connects to a much wider cylindrical air-filled bulb that has a spherical glass bulb at its end about one-third with mercury that ends in a small cylindrical tip. The stem has a paper scale that goes from 1.180 to 1.120.
Signedmarked on stem: Dr. H. Geissler Nachf. Frz. Müller in Bonn.
Inscribednear signature: Specif. Gewicht temp 15°Cels
on cardboard case: Personal Property of Prof. T.W. Richards [and] 1.12/1.18
FunctionThis is a very precise and narrowly ranged hydrometer to determine the specific gravity of liquids close in density to salt water.
As with most hydrometers, one would determine a liquid's specific gravity by letting it float in the liquid and observing the level that the surface reached on the hydrometer's scale.
As with most hydrometers, one would determine a liquid's specific gravity by letting it float in the liquid and observing the level that the surface reached on the hydrometer's scale.
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1900-1920
Accessories: green cylindrical cardboard case
Object number: 4446
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1900-1920
Accessories: blue cylindrical cardboard case
Object number: 4447
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1920
Accessories: black cardboard case with green inner surface
Object number: 4399
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1910
Accessories: green cardboard case
Object number: 4389
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1920
Accessories: hinged black case with violet velvet lining
Object number: 4428
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1920
Accessories: brown and green mottled case with missing top
Object number: 1998-1-0737
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1920
Accessories: wooden cylindrical case
Object number: 4975
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1910
Accessories: black cardboard case with red inner surface
Object number: 4381
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1920
Accessories: black cardboard case with red inner surface
Object number: 4404
Dr. H. Geissler, Nachfolger Franz Müller
Date: 1890-1920
Accessories: wooden case
Object number: 4411