Aneroid Barometer

Aneroid Barometer

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Description
This is a cylindrical instrument, 5.5 inches in diameter. The silvered face is marked “SIGNAL SERVICE U.S. ARMY / L. CASELLA / MAKER TO THE ADMIRALTY & ORDNANCE / LONDON / COMPENSATED / 2634 / ‘FOR ISSUE’ / NO 21.” The scale around the circumference of the face extends from 17 to 22 inches of mercury, graduated in tenths; another scale indicates altitudes from below 10,000 to above 15,000 feet.
This was probably made after 1870 when the Signal Service was charged with organizing a national weather service. And it was probably made before the establishment of the U.S. Weather Bureau, as a civilian agency, in 1890.
Location
Currently not on view
Object Name
aneroid barometer
date made
circa 1856-1897
circa 1870-1897
1870 - 1890
maker
L. P. Casella
place made
United Kingdom: England, London
Measurements
overall: 5 1/2 in; 13.97 cm
overall: 6 3/4 in x 2 1/8 in x 5 3/4 in; 17.145 cm x 5.3975 cm x 14.605 cm
ID Number
PH.314547
accession number
204612
catalog number
314547
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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