Concave Rowland-type diffraction grating on specul

Made:
1926, April in Baltimore
designer:
Henry Augustus Rowland

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Concave Rowland-type diffraction grating on speculum metal, grating area 84 x 53 mm, with faint scratched markings reading 'Ruled by R W Wood and R Canfield / Johns H . . . .' [remainder indecipherable] and with 'Ruled by / R W Wood / and / R Canfield / Johns Hopkins U / April 1926' painted on the back, in felt-lined wooden case.

Details

Category:
Optics
Object Number:
2000-1452
Materials:
brass, felt, speculum metal and wood
Measurements:
grating block: 13 x 110 x 110 mm
case, overall: 30 x 127 x 130 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)