radio tuning helix
date: label: date made
content: ca 1914
notes: label: Description (Brief)
content: Radio tuning helix mounted on a wooden base. No extant makers markings. Unit is a tuning helix for a spark transmitter. A single coil of solid copper wire about .125" diameter is mounted on a fixed wooden frame. An identical coil is mounted on an adjustable frame controlled by a toothed-gear. Clips on the back of each frame permit tapping the coils for the desired inductance. Reference: very similar to "Electro" commercial oscillation transformer advertised in Electro Importing Company Catalog, 1914, page 34.
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.321090
label: catalog number
content: 321090
label: accession number
content: 241556
objectType: label: Object Name
content: tuning helix
physicalDescription: label: Measurements
content: overall: 13 in x 8 1/4 in x 6 in; 33.02 cm x 20.955 cm x 15.24 cm