Declinometer

Description
A declinometer measures the horizontal angle between the geographic and magnetic poles of the earth (also known as the declination, or variation, of the magnetic needle). This particular form was introduced by H. P. Gambey of Paris in the 1830s and remained popular in France throughout the century. This example was purchased in France and was probably produced there as well. It consists of a heavy stone base, a bar magnet supported by a thread, and microscopes at either end to read the magnet's position.
Ref: E. Mascart, Traite; de Magnetism Terrestre (Paris, 1900), p. 189-190.
Location
Currently not on view
Date made
ca 1830-1845
maker
Gambey, Henri Prudence
Place Made
France: Île-de-France, Paris
Physical Description
metal (overall material)
marble (base material)
Measurements
overall: 19 1/4 in; x 48.895 cm
overall: 2 in x 24 in x 9 3/4 in; 5.08 cm x 60.96 cm x 24.765 cm
ID Number
1982.0668.01
accession number
1982.0668
catalog number
1982.0668.01
subject
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History, Kenneth E. Behring Center

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