Marconi type 107-A crystal detector
date: label: date made
content: c 1914
label: date made
content: ca 1914
label: associated date
content: 1912
name: label: maker
content: Marconi Wireless Telegraph Co. Ltd.
notes: label: Description (Brief)
content: No nameplate. This is a modified Fleming Value receiver of 1914 manufactured by Marconi Wireless Telegraph Co. of America. Provision made for use of Cerusite, Carborundum or a Fleming Value detector. Special six point double throw switch (marked charge-over switch) disconnects large capacity (.01 mfd) condenser across the intermediate circuit, and places it in shunt to secondary winding and the billi-condenser. Secondary then will respond to a wider range of wavelengths. For reception of wavelengths exceeding 1500 meters, a DPDT switch is thrown to "standby" position and the intermediate circuit cut out. For wavelengths below 1000 meters either "standby" or "tune" circuits can be employed. REF: "Greenwood-Clymer", page 49; Bucher, "Practical Wireless Telegraphy", pp. 144-148; Restored by R. LeRoche 8/1963.
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.320704
label: accession number
content: 241556
label: catalog number
content: 320704
label: accession number
content: 241556
objectType: label: Object Name
content: Radio receiver
label: Object Name
content: crystal radio
label: Other Terms
content: Radio receiver; Radio
physicalDescription: label: Measurements
content: overall: 9 3/4 in x 17 in x 14 in; 24.765 cm x 43.18 cm x 35.56 cm