Bolt and nut sets (4) for attaching the right vacuum gauge -.01.06 to the right diffusion pump from Hydrogen Maser of Norman Ramsey
date: label: date made
content: 1959-1960
name: label: maker
content: Ramsey, Norman F.
notes: label: Description (Brief)
content: Bolt and nut sets (4) for attaching the right vacuum gauge (01.06) to the right diffusion pump (.01.01) from Hydrogen Maser of Norman Ramsey. Object ID 1980.0594.01.10
label: Description (Brief)
content: The object is one of the 11 separate parts of the Ramsey hydrogen maser (1980.0594.01), which consists of an assembly of a glass hydrogen dissociator tube (.01.04), a hexapole state selector electromagnet, a beam tube, and two vacuum pumps (.01.01), all supported by a bolted steel frame; and connected by a beam tube to a silver-plated quartz microwave cavity with tuning plunger (.01.02), surrounded by three mutually perpendicular sets of Helmholtz coils (.01.03). The cavity and coils are supported by a second smaller steel frame. The assembly was displayed in Atomic Clocks exhibition. After the exhibition closed in 1988, the object was dismantled to prepare it for crating and storage. It was dismantled into 11 separate parts (see object IDs 1980.0594.01.01 - .11)
place: label: place made
content: United States: Massachusetts, Cambridge, Harvard University
topic: label: general subject association
content: Science & Scientific Instruments
label: general subject association
content: Modern Physics
setName: label: See more items in
content: Medicine and Science: Modern Physics
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Harvard University.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1980.0594.01.10
label: catalog number
content: 1980.0594.01.10
label: accession number
content: 1980.0594
objectType: label: Object Name
content: bolt and nut sets
physicalDescription: label: Physical Description
content: steel (overall material)
label: Measurements
content: overall (height x width x depth): 3 cm x 1 cm x 1 cm; 1 3/16 in x 13/32 in x 13/32 in