Clapp-Eastham / Duck receiving transformer and tuner
date: label: date made
content: ca 1915
name: label: maker
content: Clapp-Eastham Co.
notes: label: Description (Brief)
content: Unit is essentially a tri-axial receiving transformer used in conjunction with a 15-plate variable condenser. The variable inductance consists of primary and secondary coils wound in slotted hard rubber concentric rings rotating within each other to vary the coupling. Multi-point switches arranged on the same shaft vary the inductance of primary and secondary windings. Original sale price: $33 without accessories. Unit known as Blitzen Receiving Set. Reference: Clapp-Eastham catalog M (ca 1915), page 16. Label (ivory?) on front reads: "The J. J. Duck Co. / Anything Electrical or Wireless / Toledo, Ohio." The coil mounted inside on the back wall is stamped: "Clapp Eastham Co. / D".
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.320844
label: catalog number
content: 320844
label: accession number
content: 241556
objectType: label: Object Name
content: Inductance, Variable
label: Object Name
content: inductance
label: Object Name
content: radio component
label: Other Terms
content: radio component; Radio
physicalDescription: label: Measurements
content: overall: 5 1/4 in x 10 in x 7 in; 13.335 cm x 25.4 cm x 17.78 cm