First goniometer of plate circuit for visual radio beacon
date: label: date made
content: 1926-08-3
label: associated date
content: 1926
name: label: associated user
content: unknown
label: associated institution
content: Bureau of Standards
label: maker
content: Dunmore, Francis W.
notes: label: Description (Brief)
content: "Resembles large variometer crudely made of crating material, rotor operated by wooden disc, 360 degrees" 16.5 x 11 x 11" "First goniometer for visual radio beacon - plate circuit " NBS# X31.
label: Description (Brief)
content: A wooden frame in which is mounted two pairs of nested coils. The outer (larger) pair is fixed in place with the coils (many turns of cloth insulated thin wire) at an approximate 45 degree angle to each other. The inner (smaller) pair can rotate within the larger pair. The coils (5 turns each of heavier cloth-insulated wire) are fixed at a 90 degree angle to each other. A plastic dial mounted on a wooden plate includes a paper scale graduated 0 to 350, and is mounted on the top of the axle that holds the inner coil pair. A steel pointed is mounted on top next to the dial. (The dial has broken away from the axle and will need repair.) The axle extends from the bottom of the unit about 3" and serves as a conduit for two cloth insulated lead wires that attach to connecting clips on the bottom plate. Two additional connecting clips are on the top plate.
label: Description (Brief)
content: "31" written in red on one side. " Written on the bottom plate: "First plate circuit / type goniometer / made Aug. 3, 1926 / See Dunmore / time card / this date".
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: U.S. Department of Commerce, National Bureau of Standards
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.313595
label: catalog number
content: 313595
label: accession number
content: 188571
label: collector/donor number
content: X31
objectType: label: Object Name
content: Inductance, Variable
label: Object Name
content: inductance, goniometer
label: Other Terms
content: Inductance, Variable; Components; Radio and Television; Radio and Television
physicalDescription: label: Physical Description
content: wood; steel; brass; cord; plastic (composite); cloth tape; wire; paper (overall material)
label: Measurements
content: overall: 22 in x 12 in x 12 in; 55.88 cm x 30.48 cm x 30.48 cm