Permeability Test Coil
date: label: date made
content: ca 1890
notes: label: Description (Brief)
content: A toroidal coil mounted on a wooden base with copper straps, insulated copper wire, two connecting ports in center. The coil is wound about 85% around a set of cloth-wrapped plates, square cross-section. Label in center reads: "Core = 79 discs, .19" thick / 7" inside dia. 10" outside / Weight of core = 13 1/2 lbs. / 125 turns on Primary." Printed between contacts: "4". Tufts #128. 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.328098.01
label: catalog number
content: 328098.01
label: accession number
content: 270107
label: collector/donor number
content: 127
objectType: label: Object Name
content: Coils, Permeability Test
label: Object Name
content: test coil
label: Other Terms
content: Coils, Permeability Test; Coil, Permeability Test; Magnetic Devices
physicalDescription: label: Measurements
content: overall: 5 in x 12 1/2 in; 12.7 cm x 31.75 cm