RCA-WSA model UC1820 variable condenser
date: label: date made
content: ca 1922
name: label: maker
content: Wireless Specialty Apparatus Co.
label: maker
content: Radio Corporation of America
notes: label: Description (Brief)
content: Marked: "Faradon / Condenser Model UC 1820 / Radio Corp. of America / Made by / Wireless Specialty Apparatus Co. / Boston / U.S.A." The UC-1820 is a variable air capacitor with a range of .00004 to .0006 MFD. Two units can be stacked in parallel thus doubling the maximum capacity to .0012 MFD. Fixed tubular condensers can be inserted into clips on the unit providing further capacity variation, or grid leak resistances can be inserted instead. This specimen has a 2 megohm grid leak resistance in the clip. The movable element of the capacitor is fastened to a steel shaft set in brass bearings. Spacing between the plates is 10/1000 of an inch. Reference: RCA catalog "Radio Enters the Home," 1922, pages 50-51.
label: Location
content: Currently not on view
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.321570
label: accession number
content: 241556
label: catalog number
content: 321570
objectType: label: Object Name
content: condenser
label: Object Name
content: variable condenser
label: Object Name
content: variable capacitor
physicalDescription: label: Measurements
content: overall: 4 in x 3 1/2 in x 3 in; 10.16 cm x 8.89 cm x 7.62 cm