Plane Rowland diffraction grating on speculum meta

Made:
1895-1909 (estimated) in Allegheny City and Baltimore
maker:
Henry Augustus Rowland

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Plane Rowland diffraction grating on speculum metal, grating area 45 x 35 mm, with scratched markings reading 'Plate prepared at the Astronom / ical and Physical Instrument / Works of J A Brashear / Allegheny Pa USA', 'Ruled on Rowlands Engine / Johns Hopkins Univty / Baltimore Md / USA', 'AE... / 1896' and '14438 lines to one inch / 568 to one m/m', in blackened metal stand with removable glass cover and three adjustable feet.

Details

Category:
Optics
Object Number:
2000-1444
Materials:
glass, metal and speculum metal
Measurements:
stand, overall: 72 x 115 x 102 mm
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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)