reflection diffraction grating on speculum metal,

Made:
1879 in New York
maker:
D C Chapman

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reflection diffraction grating on speculum metal, engraved: 1879, 29, 520 spaces, 17296 per inch, manufactured by D. C. Chapman, New York, United States with L. M. Rutherfurd's engine, with dark red leather case

Details

Category:
Optics
Object Number:
1980-923
Materials:
brass (copper, zinc alloy), chamois leather, leather, metal, speculum (alloy of copper and tin), textile, velvet, wood
Measurements:
grating: 77 mm x 76 mm x 7 mm, , .405kg
case closed: 22 mm x 87 mm x 87 mm, , .04kg
type:
diffraction grating - reflection
taxonomy:
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • optical instrument component
  • diffraction grating
status:
Permanent collection

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