Declinometer
date: label: Date made
content: ca 1830-1845
name: label: maker
content: Gambey, Henri Prudence
notes: label: Description
content: 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 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 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.
label: Description
content: Ref: E. Mascart, <i>Traite; de Magnetism Terrestre</i> (Paris, 1900), p. 189-190.
label: Location
content: Currently not on view
place: label: Place Made
content: France: Île-de-France, Paris
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Measuring & Mapping
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0668.01
label: accession number
content: 1982.0668
label: catalog number
content: 1982.0668.01
objectType: label: Object Name
content: declinometer
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: marble (base material)
label: Measurements
content: overall: 19 1/4 in; x 48.895 cm
label: Measurements
content: overall: 2 in x 24 in x 9 3/4 in; 5.08 cm x 60.96 cm x 24.765 cm