Pocket Aneroid Barometer

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This is a small instrument in a silvered case, 1¼ inches diameter, and ⅞ inches deep. The circumference of the face is marked “SEMMONS OCULIST OPTICIAN, 687 BROADWAY, NEW YORK” and “S. M. R. R. C. F. S. F. V. D.” The altitude scale reads from –1,000 to +12,000 feet, in increments of 100 feet. The pressure scale reads from 19 to 31 inches of mercury, in fifths of an inch. There is a leather case that also holds a mercury thermometer and a magnifying lens.
This may have been made in the early 1870s when an optician names Semmons was in business in New York, and selling instruments imported from Europe. The U.S. Weather Bureau transferred it to the Smithsonian in 1954.
Currently not on view
date made
overall in case: 2 in x 3 in x 3 1/2 in; 5.08 cm x 7.62 cm x 8.89 cm
ID Number
accession number
catalog number
Credit Line
U.S. Weather Bureau
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Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History


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