transmitter tuning helix
date: label: date made
content: ca 1921
notes: label: Description (Brief)
content: No extant maker's markings. A transmitter tuning helix for an amateur radio transmitter. Two movable coils slide on a wooden frame. One coil has two turns of copper sheeting, 3.25" wide. The second coil has eight turns of copper sheeting 1.625" in width. Coil diameters are 17.5" each. Coupling is varied by adjusting distance between the coils. Reference: almost identical to T&H Oscillation Transformer advertised in QST, May 1921, page 78. Manufacturer of that unit is T&H Radio Company, Anthony, Kansas.
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.321097
label: catalog number
content: 321097
label: accession number
content: 241556
objectType: label: Object Name
content: tuning helix
physicalDescription: label: Measurements
content: overall: 24 in x 19 in x 19 in; 60.96 cm x 48.26 cm x 48.26 cm