Plane diffraction grating with 14,438 lines per in

Made:
1890 in Baltimore
maker:
Henry Augustus Rowland

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Plane diffraction grating with 14,438 lines per inch ruled on Rowland's engine at Johns Hopkins University on a plate prepared at the Astronomical and Physical Instrument Works of J.A. Brashear at Allegheny in 1890, on oxidised brass mount with circular rack and pinion for rotating grating, and three levelling screws

Details

Category:
Optics
Object Number:
1996-305
Measurements:
grating: 35 x 45 mm
brass mount: 120 x 110 mm
type:
diffraction grating - reflection
taxonomy:
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • optical instrument component
  • diffraction grating
credit:
Epsom College