resistance coil mounted on wooden frame
date: label: date made
content: ca 1918
label: date made
content: ca. 1918
notes: label: Description (Brief)
content: A variable resistance consisting of a copper coil wound on a ceramic mandrel, mounted on a wooden base. A sliding contact mounted above the coil is used to vary the electrical resistance of the unit. Two binding posts allow connection to external circuit. Donor was Robert Williams Wood (1868-1955), professor of optics at Johns Hopkins University (1901-1955).Unit may have been used to control the light output of a flash telescope military signaling device during World War I.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Robert W. Wood
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.317948.06
label: catalog number
content: 317948.06
label: accession number
content: 232066
objectType: label: Object Name
content: Rheostat
label: Other Terms
content: Rheostat; Components; Radio and Television; Radio and Television
physicalDescription: label: Measurements
content: overall: 2 3/4 in x 10 1/4 in x 2 3/4 in; 6.985 cm x 26.035 cm x 6.985 cm