Diffraction Grating

Diffraction Grating

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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.
Currently not on view
Object Name
diffraction grating
date made
place made
United States: Maryland, Baltimore
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
catalog number
accession number
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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