Solar Spectrum

Solar Spectrum

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Description
“PHOTOGRAPHIC MAP OF THE SOLAR SPECTRUM / MADE BY PROF. H. A. ROWLAND, JOHNS HOPKINS UNIVERSITY.” This is from the first series, and extends from 37.1 to 39.85 units
Henry A. Rowland, the first professor of physics at Johns Hopkins University in Baltimore, Md., produced a photographic map of the solar spectrum using concave diffraction gratings made with his own ruling engine. The first edition, published in 1886, covered the region from wave-length 3100 to 5790. The scale of these maps was much greater than the maps of Angstrom or Rutherfurd, and they showed many more spectral lines.
Ref: “Photograph of the Normal Solar Spectrum. Made by Professor H. A. Rowland,” Johns Hopkins University Circular 5 (1886).
Location
Currently not on view
Object Name
spectrum photograph
date made
1886
maker
Rowland, Henry A.
place made
United States: Maryland, Baltimore
Measurements
overall: 11 3/16 in x 35 3/8 in; 28.41625 cm x 89.8525 cm
ID Number
PH.322957.03
accession number
249200
catalog number
322957.03
Credit Line
Columbia University
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History
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