Rotary spark gap for radio transmitter
date: label: Date made
content: 1919
notes: label: Description (Brief)
content: Rotary spark gap used in amateur station 3BV. A wooden base on which is mounted two brass and plastic posts, each having an adjustable plunger with an electrode, and a connecting screw. A rotating wheel with twelve spokes is mounted between the posts. No extant makers markings. The base does not appear to be original to the piece. A motor to operate this unit may be catalog number 325496. The unit is mounted in a display case with other pieces from station 3BV. A copper wire leads from one post to a condenser pack (catalog number 325497) also displayed in the case. Another copper wire leads from the other post to the outer coil of the oscillation transformer catalog number 325494.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.325495
label: catalog number
content: 32549
label: accession number
content: 252994
objectType: label: Object Name
content: transmitter
label: Object Name
content: spark gap
physicalDescription: label: Measurements
content: overall: 7 1/2 in x 14 in x 3 3/4 in; 19.05 cm x 35.56 cm x 9.525 cm