Diffraction Grating

Diffraction Grating

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Description
Robert William Wood (1868-1955) succeeded Henry A. Rowland as professor of physics at Johns Hopkins University; and under his leadership, Rowland’s ruling engine continued to produce diffraction gratings. This example came from the Smithsonian Astrophysical Observatory. Its base is speculum metal. An inscription reads “Ruled Oct. 1, 1929 / concentrates at 16-17 order λ5461 or 8.5-9μ / 1312 lines per inch / R. W. Wood & H. M. O’Bryan.”
Ref: John Strong, “The Johns Hopkins University and Diffraction Gratings,” Journal of the Optical Society of America 50 (1960): 1148-1152.
Location
Currently not on view
Object Name
diffraction grating
date made
1929
place made
United States: Maryland, Baltimore
Measurements
overall, case: 1 3/4 in x 6 in x 6 in; 4.445 cm x 15.24 cm x 15.24 cm
ID Number
PH.327696
catalog number
327696
accession number
268220
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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