Signal model R-21 loose coupler
date: label: date made
content: ca 1916
name: label: maker
content: Signal Electric Manufacturing Company
notes: label: Description (Brief)
content: Signal model R-21 radio transformer, engraved on panel: "Signal / Menominee, Mich. / Type R-21". This is a two-circuit or loose coupler using a secondary winding sliding within the primary. The secondary has a 12 tap multi-point switch; three multi-point switches are mounted on the control panel.
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.320776
label: catalog number
content: 320776
label: accession number
content: 241556
objectType: label: Object Name
content: receiving transformer
label: Object Name
content: radio receiver
label: Object Name
content: transformer
physicalDescription: label: Measurements
content: overall: 6 3/4 in x 18 in x 6 3/4 in; 17.145 cm x 45.72 cm x 17.145 cm