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A pycnometer (sometimes termed a Geissler specific gravity bottle) is a glass flask provided with an accurate and delicate thermometer, that determines the density of a liquid and how it varies with temperature. The form was devised in 1859 by the German glassworker, Heinrich Geissler (1814-1879) and the Russian chemist Dmitri Ivanovich Mendeleev (1834–1907). The inscription on this example reads "25 ML / 20° C / K / USA / 1560."
The “Jenaer Normalglass Germany” inscription on the thermometer refers to the Jenaer Glaswerk Schott and Genossen, established in 1884.
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Object Name
Physical Description
glass, ?, transparent (overall material)
ID Number
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Medicine and Science: Medicine
Data Source
National Museum of American History
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