Clapp-Eastham type 652 oscillation transformer
date: label: date made
content: ca 1922
name: label: maker
content: Clapp-Eastham Co.
notes: label: Description (Brief)
content: Marked: "Clapp-Eastham Co. / Manufacturers / Cambridge, Mass." An oak frame carries slotted bakelite arms that support primary and secondary windings. Depth is 16" at full extension. The primary consists of five-turns edgewise copper strip, 7.5" inside diameter. The secondary consists of six-turns edgewise copper strip, 10/75" inside diameter. The primary is continuously adjustable by means of a rotating handle. helix clips are used on the secondary. Coupling between primary and secondary is varied by the hinged method. Reference: F. D. Pitts Co. Inc Catalog No. 22, page 72.
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.321213
label: catalog number
content: 321213
label: accession number
content: 241556
objectType: label: Object Name
content: tuning helix
physicalDescription: label: Measurements
content: overall (closed): 12 3/4 in x 13 1/2 in x 6 in; 32.385 cm x 34.29 cm x 15.24 cm