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This lactometer was invented by Louis Heusner, a physician in Bavaria. It consists of parallel transparent plates for comparing the color of a same with that of a standard. The inscription on the cardboard box reads “D. HEUSNER’S PATENT MILCHSPIEGEL” and “Das Einfüllen der Milch.”
Ref: Louis Heusner, “Lactometer,” U.S. Patent 190587 (May 8, 1877).
Currently not on view
Object Name
patented by
Heusmer, Louis
carton: 2 in; x 5.08 cm
instrument: 1 3/4 in; x 4.445 cm
overall: 3/4 in x 2 3/16 in; 1.905 cm x 5.55625 cm
ID Number
accession number
catalog number
patent number
See more items in
Medicine and Science: Chemistry
Data Source
National Museum of American History
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