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Title: Concave Rowland-type diffraction grating on speculum metal, [Go to resource]
Description: Concave Rowland-type diffraction grating on speculum metal, grating area 139 x 57 mm, with scratched markings reading 'Ruled at J. H. U. 1934 / R. W. Wood & W. H. Perry / 30,000 lines per inch / 21' radius of curvature'. (J. H. U. = Johns Hopkins University.) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: diffraction grating - reflection Temporal: 1934 Source: Science Museum Creator: Wood, R. W. Identifier: 2000-1447 Go to resource More Like this...
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