RCA-GE model PR-539 rheostat
date: label: date made
content: ca 1922
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: Marked: Box "Filament Rheostat / Model PR-539 / Series 33 Ohms .25 Amp. / Parallel: 8.2 Ohms .5 Amp. / For one to six radiotrons / UV-199 / Mfd. by General Electric Co., USA / for Radio Corporation of America." A variable resistance unit in original box. Two winding filament rheostat for UV-199 vacuum tubes. Two contacts, single side sweep.
label: Location
content: Currently not on view
place: label: place made
content: United States
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321644
label: model number
content: PR-539
label: catalog number
content: 321644
label: accession number
content: 241556
objectType: label: Object Name
content: rheostat
label: Object Name
content: variable resistance
physicalDescription: label: Measurements
content: unit: 2 7/8 in x 2 in x 2 1/2 in; 7.3025 cm x 5.08 cm x 6.35 cm
label: Measurements
content: box: 2 1/8 in x 3 1/8 in x 2 7/8 in; 5.3975 cm x 7.9375 cm x 7.3025 cm