Concave Rowland diffraction grating on speculum me

Made:
1882, Nov 6 in Baltimore and Allegheny City
designer:
Henry Augustus Rowland
and
Henry Augustus Rowland
and

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Concave Rowland diffraction grating on speculum metal, grating area 80 x 52 mm, with scratched markings reading 'Ruled on Rowland's machine / Johns Hopkins University Baltimore / 14438 lines to inch / to Capt. Abney / with kind regards / H. A. Rowland, Nov. 6 1882', almost certainly on a plate prepared in J. A. Brashear's works, with remnant of film used for cleaning grating on part of surface.

Details

Category:
Optics
Object Number:
2000-1448
type:
diffraction grating - reflection
taxonomy:
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • optical instrument component
  • diffraction grating
credit:
Imperial College of Science,Technology & Medicine (Spectroscopy Group)