reflection diffraction grating on speculum metal
- maker:
- D C Chapman
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© The Board of Trustees of the Science Museum
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:
- metal, speculum (alloy of copper and tin), wood, leather, chamois leather, brass (copper, zinc alloy), textile and velvet
- Measurements:
-
grating: 77 mm x 76 mm x 7 mm, , .405kg
case closed: 22 mm x 87 mm x 87 mm, , .04kg
