Clapp-Eastham type HR 175-825 radio receiver
date: label: date made
content: ca 1922
name: label: maker
content: Clapp-Eastham Co.
notes: label: Description (Brief)
content: Marked: "Regenerative Receiver / Type H.R. 175-825 Meters / Clapp-Eastham Co. / Cambridge, Mass. / Licensed Under Armstrong U.S. Pat. 1113149 Oct. 6, 1914. / For Use in Amateur Experimental and Scientific School Radio Stations. "Radak" not stamped on faceplate. Serial number 2273 stamped on wooden frame. A regenerative radio detector using single 201-A type triode (missing). Feedback is accomplished with a tickler coil adjustable from front hard rubber panel. A sweep switch cuts antenna inductance in our out of circuit. An additional variable capacity serves for station tuning, and filament rheostat controls current. Telephone binding posts and battery connections, antenna and ground, are available on front panel. The single circuit regenerative detector was licensed under Armstrong patent 1113149. Reference: Clapp-Eastham Bulletin F2, 1922, pages 3-4; Langley Set Index, page 15.
label: Location
content: Currently not on view
place: label: place made
content: United States: Massachusetts, Cambridge
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.321520
label: accession number
content: 241556
label: catalog number
content: 321520
label: patent number
content: 1113149
objectType: label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 9 3/8 in x 7 7/8 in x 6 in; 23.8125 cm x 20.0025 cm x 15.24 cm