Marconi crystal radio tuner and detector
date: label: date made
content: c 1912
label: date made
content: ca 1912
name: label: maker
content: Marconi Wireless Telegraph Co. Ltd.
notes: label: Description (Brief)
content: Marked: "Marconi's Wireless Telegraph Co., Ltd. / No. 180014 - London." Instrument is designed to receive code signals in the wavelength range of 200-2500 meters. Aerial tuning inductance normally used with this specimen missing. Essentially, unit is an oscillation transformer or "jigger", and crystal detector with components mounted on an ebonite type panel. Wooden case is also missing. Secondary coil of the "jigger" winding is wound in three sections to obtain three wavelength ranges. Switches are proved to cut in the desired band. Connected across the ends of the "jigger" secondary winding is an adjustable tuning condenser, fitted with an index and scale. This circular slide condenser is varied in capacitance by turning a circular ebonite adjusting handle. Reference: "Description of the Marconi Crystal Receiver, Pattern No. 31a," Marconi's Wireless Telegraph Company, Ltd., (Undated). Clark Collection: SRM 47-093.
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.320882
label: accession number
content: 241556
label: catalog number
content: 320882
objectType: label: Object Name
content: crystal radio
label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 3 1/4 in x 13 3/8 in x 6 3/4 in; 8.255 cm x 33.9725 cm x 17.145 cm