Geissler Minimum Thermometer

This is a Rutherford-type minimum thermometer with a bifurcated bulb. The tube scale is graduated every .2 degrees from -50 to +40, and its milk-glass backing is marked "H. Geissler in Bonn" and "Centigrade." The whole is enclosed in an outer glass cylinder.
Heinrich Geissler began manufacturing chemical and physical apparatus in Bonn in 1852 and soon acquired a worldwide reputation. Franz Müller joined the firm in 1874 and, after Geissler's death in 1879, did business as Dr. H. Geissler, Nachfolger Franz Müller.
This example came to the Smithsonian from Western Reserve University, and was probably used by Edward W. Morley, a noted American scientist.
Currently not on view
Object Name
date made
ca 1852-1897
Physical Description
glass (overall material)
overall: 16 1/4 in; 41.275 cm
place made
Deutschland: North Rhine-Westphalia, Bonn
ID Number
catalog number
accession number
Measuring & Mapping
Thermometers and Hygrometers
See more items in
Medicine and Science: Physical Sciences
Thermometers and Hygrometers
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Western Reserve University

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