Aneroid Barometer

Description
This is a brass instrument, 3¼ inches diameter. The silvered dial is marked “Improved Altitude Scale / Surveying Aneroid / Compensated” and “GEORGE E. BUTLER / SAN FRANCISCO” and “MADE IN ENGLAND” and “IMPD PAT / NO 7318.” The back of the case is marked “TRADE MARK LONDON.” There is also a leather case with strap.
The circumference of the face has three scales reading from 0 to 15000 feet: one in 25 foot increments, one in 50 foot increments, and one in 100 foot increments. A pressure scale reads from 18 to 31 inches of mercury. A smaller scale at the bottom of the face reads the temperature from 30 to 130 degrees Fahrenheit.
This instrument is based on a British patent for “An Improvement in Metallic Thermometers and Barometers” that was issued to Thomas Wheeler, of London, in 1894. It may have been made by F. Barker & Son, a London firm that that is known to have produced compasses and aneroid barometers. It was sold by George E. Butler, a jeweler in San Francisco in the early 20th century.
Location
Currently not on view
date made
ca 1900
place made
United Kingdom: England, London
Measurements
overall; barometer: 1 1/4 in x 3 1/8 in x 4 3/16 in; 3.175 cm x 7.9375 cm x 10.63625 cm
overall; case: 1 5/8 in x 3 1/2 in x 4 1/4 in; 4.1275 cm x 8.89 cm x 10.795 cm
ID Number
PH*335617
catalog number
335617
accession number
1977.0058
Credit Line
Doris Hoffman
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Barometers
Data Source
National Museum of American History, Kenneth E. Behring Center

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