Concave Rowland diffraction grating on speculum me

Made:
1894 in Baltimore and Allegheny City
maker:
Henry Augustus Rowland

Concave Rowland diffraction grating on speculum metal, grating area 53 x 23 mm, with scratched markings reading 'Plate prepared at the Astronomical / and Physical Instrument Works / of J A Brashear Allegheny, PA USA / 1894' and 'Ruled on Rowlands first [?] Engine / Johns Hopkins University / Baltimore Md USA / 1894', in wooden case marked 'V.210.' A paper label on the box marked in German indicates (according to the donor) that the grating came from Paschen's laboratory.

Details

Category:
Optics
Object Number:
2000-1443
Materials:
speculum metal, wood
Measurements:
case: 25 x 75 x 75 mm
grating block: 10 x 62 x 62 mm
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)
status:
Permanent collection

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