Radio transmitter tuning helix
date: label: date made
content: ca 1915
notes: label: Description (Brief)
content: Radio transmitting tuning helix for amateur radio transmitter of the 1915 period. No extant maker's markings. The larger coil (8.75" diameter) consists of 10 turns of .75" copper stripping wound across wooden brace bars. The smaller coil (7.5" dia) has 3 turns of .75" copper stripping. Coupling between the coils is adjustable by a hinge set between the wooden cross-pieces.
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.321418
label: catalog number
content: 321418
label: accession number
content: 241556
objectType: label: Object Name
content: tuning helix
physicalDescription: label: Measurements
content: overall: 12 in x 11 in x 12 1/2 in; 30.48 cm x 27.94 cm x 31.75 cm