Ruhmkorff Nobili-type needle galvanometer
date: label: date made
content: ca 1865
name: label: maker
content: Ruhmkorff, Heinrich Daniel
notes: label: Description (Brief)
content: Galvanometer with brass frame and glass cover. Original suspension thread was missing and has been replaced. Marked "Ruhmkorff, Rue des Orferes 6, Paris" No number on end of tangent screw shaft. Two binding posts.
label: Description (Brief)
content: In 1825, Leopoldo Nobili (1784-1835), an Italian physicist, introduced a sensitive astatic galvanometer that could detect relatively small electric currents, and that was soon popular with scientists around the world. This example came from the Department of Electrical Engineering at Princeton University. The "Ruhmkorff, Rue des Orferes 6, Paris” inscription refers to Heinrich Daniel Ruhmkorff (1803-1877), a German instrument maker who established a shop in Paris in 1855. Reference: MacLaren, Rise of Electrical Industry, Fig.82, p.136.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Princeton University, Dept. of Electrical Engineering, thru Dean Howard Menand
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.318556
label: catalog number
content: 318556
label: accession number
content: 232729
objectType: label: Object Name
content: galvanometer
physicalDescription: label: Measurements
content: overall: 11 in x 9 in; 27.94 cm x 22.86 cm