Adjustable radio spark coil with gap
date: label: date made
content: ca 1910
notes: label: Description (Brief)
content: No extant markings. Appears to be a portable demonstration spark coil unit. A Ruhmkorff type coil with interrupter is mounted on a wooden base. Leads are affixed to rods 6 3/4" long which terminate in round spheres. Spark gap width is adjusted by a screw mechanism. Coil measurements (including frame) are 8.125" L X 4.5" W. On-OFF switch and binding posts are on the base. Hinged lid with carry handle.
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.320999
label: catalog number
content: 320999
label: accession number
content: 241556
objectType: label: Object Name
content: spark coil
physicalDescription: label: Measurements
content: overall: 12 in x 14 5/8 in x 11 1/2 in; 30.48 cm x 37.1475 cm x 29.21 cm