Clapp-Eastham "Radak" model R-4 radio receiver
date: label: date made
content: ca 1923
name: label: maker
content: Clapp-Eastham Co.
notes: label: Description (Brief)
content: Marked: "Clapp-Eastham Co. / Cambridge, Mass. / Licensed under Armstrong U.S. / Patent 1113149, Oct. 6, 1914 / for use in amateur experimental and scientific school radio stations. Regenerative detector with antenna variometer control and regeneration control. A type UV 199 tube in adapter base is employed. Panel binding posts for antenna, ground, and telephones. Unit sold for $25 in 1923. REF: "Langley Set Index", page 15.
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.320728
label: patent number
content: 1113149
label: catalog number
content: 320728
label: accession number
content: 241556
objectType: label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 9 3/8 in x 8 in x 6 in; 23.8125 cm x 20.32 cm x 15.24 cm