Westinghouse type CL-2 cesium vapor lamp
date: label: date made
content: ca 1943
name: label: maker
content: Westinghouse Electric Corporation
notes: label: Description (Brief)
content: Brass mogul base with glass insulator. Tipless T-shaped envelope. Very similar in construction to mercury vapor lamps of the 1930s and 40s. Interior arc-tube mounted on metal discs in a frame. Braided leads. Cesium fill. Stamped on top: "Type CL-2 / [W logo] / 90W 5.5 A". Inked on press: "1011". Donor’s card reads: “Cesium vapor lamp made by Westinghouse Company for US government use during World War II. Made for visual signaling by means of a modulated infrared light beam. Modulation can be either voice or a code signal with frequencies up to 10 kilocycles and with modulation up to 100%. If desired or necessary, an ultra-red filter can be used to completely cancel out the visible portion of the radiation. Two warm-up filaments, 2.5 volts at 6 amperes, are located in the ends of the cesium capsule found in the top half of the tube. These filaments are separate and distinct from each other, using the four pins on the base for their lighting. These filaments are lighted for 1 minute, than an 18 volt “space” current at 5.5 amperes is connected from one filament to the other., and the filament lighting current is turned off. Infrared light of high intensity is then emitted from the cesium capsule. Power consumption 100 watts.”
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.325226
label: catalog number
content: 325226
label: accession number
content: 252994
objectType: label: Object Name
content: Vapor Lamp
label: Object Name
content: discharge lamp
label: Other Terms
content: Vapor Lamp; Telegraphy
physicalDescription: label: Measurements
content: overall: 12 3/4 in x 2 1/4 in; 32.385 cm x 5.715 cm