Solar Spectrum
date: label: date made
content: 1886
name: label: maker
content: Rowland, Henry A.
notes: label: Description
content: “PHOTOGRAPHIC MAP OF THE SOLAR SPECTRUM / MADE BY PROF. H. A. ROWLAND, JOHNS HOPKINS UNIVERSITY.” This is from the first series, and extends from 30.75 to 37.1 units .
label: Description
content: 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.
label: Description
content: According to “Photographs of the Solar Spectrum,” <i>American Journal of Science</i> 31 (1886): 319, "Seven plates on heavy albumen paper are offered for sale. Six contain two strips of the spectrum, and one contains three. The price for the set is $10, or $12 if mounted on cloth."
label: Description
content: Ref: “Photograph of the Normal Solar Spectrum. Made by Professor H. A. Rowland,” <i>Johns Hopkins University Circular</i> 5 (1886).
label: Description
content: Rowland, 'A Discussion of the Wavelengths of Lines in the Solar Spectrum,' <i>American Journal of Science</i> 33 (1887): 182-190.
label: Location
content: Currently not on view
place: label: place made
content: United States: Maryland, Baltimore
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Columbia University
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.322957.01
label: accession number
content: 249200
label: catalog number
content: 322957.01
objectType: label: Object Name
content: spectrum photograph
physicalDescription: label: Measurements
content: overall: 11 in x 35 in; 27.94 cm x 88.9 cm