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.)
- Object Number:
- furnishing and equipment
- tools & equipment
- optical instrument
- optical instrument component
- diffraction grating
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
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