Signal loose coupled tuner with crystal detector
date: label: date made
content: 1919
name: label: maker
content: Signal Electric Manufacturing Company
notes: label: Description (Brief)
content: Marked: "SIGNAL". Unit is a crystal detector with associated loose coupled tuner. Glass enclosed crystal holder. A fixed primary coil has a variable inductance slider on top. The secondary slides though the primary coil along two metal rods, and has a 5-point tap switch to vary inductance. A .0017 MFD capacitor mounted below the wooden base acts as a by-pass condenser which offers a high reactance to RF signals, allowing audio signals only to pass through the head-phones. Reference: a 1919 Signal unit without the crystal detector is seen in Clymer-Greenwood, page 37.
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.321320
label: accession number
content: 241556
label: catalog number
content: 321320
objectType: label: Object Name
content: radio receiver
label: Object Name
content: crystal radio
physicalDescription: label: Measurements
content: overall: 4 3/4 in x 12 in x 3 1/2 in; 12.065 cm x 30.48 cm x 8.89 cm