Gardner-Rodman / Radisco "Heliphone" pocket crystal radio receiver
date: label: date made
content: 1922
notes: label: Description (Brief)
content: Marked on fixed eyelet capacitor: "RADISCO / apparatus". "Heliphone" unit manufactured by Gardner-Rodman Corporation (16 Park Row, New York City) and distributed by Radio Distributing Company (Newark, New Jersey). Unit is a crystal set employing a copper wire as a cat's whisker. Two pancake coils employ variable coupling by sliding the inner lid panel. Four Fahenstock clips permit connections for headphones, antenna, and ground. A .001 MFD capacitor acts as an RF bypass, permitting only audio signals to pass through headphones. Wooden case with brass fittings. Original price: $5.00. Reference: Radio News, September 1922, page 415. https://www.radiomuseum.org/r/radiodis_heliophone_pocket_receiv.html.
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.321502
label: accession number
content: 241556
label: catalog number
content: 321502
objectType: label: Object Name
content: radio receiver
label: Object Name
content: crystal radio
physicalDescription: label: Measurements
content: overall: 4 1/2 in x 6 1/2 in x 1 1/4 in; 11.43 cm x 16.51 cm x 3.175 cm