Grewal crystal detector receiver
date: label: date made
content: ca 1922
notes: label: Description (Brief)
content: Marked: "The Grewal Mfg. Co. / Newark, N.J. / Pat. Pend." A crystal detector with induction coil and slider. Detector is fixed type, and has one lead to a .0005 mfd. bypass capacitor which offers a high impedance to radio frequency currents, permitting audio currents to pass through headphones. Binding posts for antenna, ground, and headphones are on the wooden base. The rigid contact wire is missing from detector unit. Reference: Electric Appliance Co. Catalog No. 61-R, undated, page 48 (for detector unit) (Clark Collection CL 15).
label: Location
content: Currently not on view
place: label: place made
content: United States: New Jersey, Newark
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.321283
label: catalog number
content: 321283
label: accession number
content: 241556
objectType: label: Object Name
content: Capacitor, Variable
label: Object Name
content: radio receiver
label: Object Name
content: crystal radio
physicalDescription: label: Measurements
content: overall: 5 1/2 in x 7 5/8 in x 7 in; 13.97 cm x 19.3675 cm x 17.78 cm