Spectrograph
date: label: date made
content: around 1960
name: label: maker
content: Jarrell-Ash
notes: label: Description
content: Established in a Boston suburb in 1933, the Jarrell-Ash Company sold and serviced quartz spectrographs made by Adam Hilger, Ltd. Richard Jarrell, a son of the founder, joined the firm after his graduation from M.I.T. in 1935, and was sent to England to learn more about Hilger instruments. He was called back to M.I.T. in 1937, to build a Wadsworth-type spectrograph for Walter Newhouse, a geology professor who wanted to determine foreign particles in various mineral specimens. Jarrell-Ash began manufacturing spectrographs of this sort soon thereafter. Like the M.I.T. prototype, the early Jarrell-Ash instruments used diffraction gratings ruled on Rowland’s engine at the Johns Hopkins University. Later ones used gratings produced on a machine developed by George W. Stroke, a refugee scientist who spent a dozen years at M.I.T.
label: Description
content: This example, a 21-foot Jarrell-Ash spectrograph model 70-15e, was used at Lehigh University. It came to the Smithsonian in 1979.
label: Description
content: Ref: Jarrell-Ash, <i>Spectrographic Equipment</i> (Boston, ca. 1947).
label: Description
content: Richard F. Jarrell and George W. Stroke, “Some New Advances in Grating Ruling, Replication, and Testing,” <i>Applied Optics</i> 3 (1964): 1251-1262.
label: Location
content: Currently not on view
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: Lehigh University
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0643.01
label: catalog number
content: 1982.0643.01
label: accession number
content: 1982.0643
objectType: label: Object Name
content: spectrograph
physicalDescription: label: Measurements
content: overall: 1 1/2 ft x 6 3/4 ft x 12 1/4 ft; .4572 m x 2.0574 m x 3.7338 m