Liberty Electric model SE-84 radio tone tester
date: label: date made
content: 1918
name: label: maker
content: Liberty Electric Corporation
label: maker
content: Clark, George H.
notes: label: Description (Brief)
content: Marked: "Radio Tone Tester / Made for Navy Dept. (Bu. of S.E.) by / Liberty Electric Corp. / Date 1918". Requisition, contract & serial numbers have been obliterated - type number SE-84 barely visible. Size: 4 3/4" diam. wheel on 5" diam. base, 7 1/2" high. This device, designed by George A. Clark, was devised to test the tone of a spark signal easily and quickly. The unit consists of a miniature crystal detector, inductance, and fixed condenser, all mounted upon a heavy cast base and equipped with two binding posts for telephone connections. The fixed condenser is contained within the inductance spool, while the detector and inductance switch are mounted directly upon alternate sides of the spool. The contact switch has three taps permitting the test of a spark tuned on any one of the standard wavelengths, 300 meters, 600 meters and 1200 meters. Frame construction is of bakelite dilecto. REF: Radio Equipment Catalog, 1919. Wireless Specialty Apparatus Co. page 64.
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.320715
label: catalog number
content: 320715
label: accession number
content: 241556
objectType: label: Object Name
content: vacuum tube tester
label: Object Name
content: vacuum tone tester
label: Object Name
content: radio tone tester
physicalDescription: label: Measurements
content: overall: 7 1/2 in x 5 in; 19.05 cm x 12.7 cm