De Forest type CS radio loading condenser
date: label: date made
content: ca 1919
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: Marked: "De Forest Radio Tel & Tel Co., N.Y. / Unit Receiving Set". An external bridging or loading condenser. Consists of a small sectional mica condenser of ten taps that are thrown in and out of the circuit by a fan switch. The sections are not of equal capacity but are tapped to give a small minimum, increasing to within 1/10th of the full capacity on the last tap. Bakelite panel is 3/16" thick. The fan switch is of phosphor bronze and contacts are nickel plated. Two binding posts on the bakelite panel provide connections to the external circuit. Specimen can be used to increase the range of a variable air condenser, or as a primary or secondary condenser where the tuning inductances are tapped. Made in .0015 and .003 MFD sizes, although the capacitance of this unit is not marked. Original price: $7.00. Reference: De Forest catalog C, 1919.
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.321472
label: accession number
content: 241556
label: catalog number
content: 321472
objectType: label: Object Name
content: variable conderser
label: Object Name
content: variable condenser
label: Object Name
content: variable capacitor
physicalDescription: label: Measurements
content: overall: 3 in x 5 1/8 in x 5 1/8 in; 7.62 cm x 13.0175 cm x 13.0175 cm