vacuum valve for GE DuFour type cathode-ray oscillograph
date: label: date made
content: ca 1929
notes: label: Description (Brief)
content: Part of the General Electric DuFour type cathode-ray oscillograph (317301.01 thru .04). According to the donor, this piece is "the valve that was used between the mercury diffusion pump and the chamber to permit continuous control of the degree of vacuum." No extant manufacturer's mark. Paper scale is graduated between 10 and 2[00] by tens. It's not clear if GE made this valve or purchased it from another company.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from the University of Michigan, Ann Arbor, College of Engineering, thru Hempstead Bull
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.317301.04
label: catalog number
content: 317301.04
label: accession number
content: 230388
objectType: label: Object Name
content: valve
physicalDescription: label: Measurements
content: overall: 16 1/2 in x 5 1/4 in x 6 1/4 in; 41.91 cm x 13.335 cm x 15.875 cm