Jewell pattern 90 wavemeter
date: label: date made
content: ca 1929
name: label: maker
content: Jewell Electrical Instrument Co.
notes: label: Description (Brief)
content: Marked: "Jewell Wavemeter / Pattern No. 90 / Range 150-625 / Serial No. 29968 / Jewell Electrical Instrument Co. / Chicago, U.S.A." Unit designed to check transmitter wavelengths between 150 and 625 meters. Hard rubber panel with swivel control for variable capacitor. The control moves a calibration dial so that wavelength may be determined by observation. Binding posts on unit presumably connect to external inductance. Resonance indicated by a small lamp.
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.321519
label: catalog number
content: 321519
label: accession number
content: 241556
objectType: label: Object Name
content: wavemeter
physicalDescription: label: Measurements
content: overall: 5 in x 6 1/2 in x 6 1/2 in; 12.7 cm x 16.51 cm x 16.51 cm