Concave Rowland-type diffraction grating on speculum metal, grating area 130 x 75 mm, with bevelled glass cover plate in heavy aluminium case. Unsigned, but similar gratings made by Brashear and Rowland. Typescript label reads '15,000 lines per inch, / right extreme 1½" defective'.
- Object Number:
grating block: 19 x 160 x 133 mm
metal case, overall: 52 x 200 x 185 mm
- furnishing and equipment
- tools & equipment
- optical instrument
- optical instrument component
- diffraction grating
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
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