Permeability Test Coil
date: label: date made
content: ca 1890
notes: label: Description (Brief)
content: A double-wound toroidal coil mounted on a wooden base with copper straps, insulated copper wire, two connecting ports. Gap in iron ring. Label in center reads: "Core No 4 / Iron ring with section cut out / Turns in Primary 211." Stamped on bottom: "J.I.T." Tufts #129. One of three permeability test coils. Prof. Rollins said these were "for testing the magnetic qualities of iron ores."
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Tufts University, Departments of Electrical Engineering and Physics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.328098.03
label: catalog number
content: 328098.03
label: accession number
content: 270107
label: collector/donor number
content: 129
objectType: label: Object Name
content: Coil, Permeability Test
label: Object Name
content: test coil
label: Other Terms
content: Coil, Permeability Test; Magnetic Devices
physicalDescription: label: Measurements
content: overall: 2 3/4 in x 10 3/4 in; 6.985 cm x 27.305 cm