Concave Rowland-type diffraction grating on speculum metal
- Made:
- 1882-1909 (estimated) in Baltimore and Allegheny City
- maker:
- Henry Augustus Rowland
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Science Museum Group
© The Board of Trustees of the Science Museum
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'.
Details
- Category:
- Optics
- Object Number:
- 2000-1446
- Materials:
- speculum metal and metal, cast
- Measurements:
-
grating block: 19 x 160 x 133 mm
metal case, overall: 52 x 200 x 185 mm
- credit:
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
