diffraction grating on speculum metal, gra
- Made:
- 1881 in New York and United States
- maker:
- D C Chapman and Lewis Morris Rutherfurd
- modifier:
- Adam Hilger
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Science Museum Group
© The Board of Trustees of the Science Museum
Diffraction grating on speculum metal, grating area 44 x 42 mm, with scratched markings reading 'Made by D. C. Chapman with / L. M. Rutherfurd's Engine / 175, 2nd Avenue New York'. 'Tested by A. Hilger July 1881' and ' July 1881 / 29880 spaces / 17296 per inch', in velvet-lined mock fish skin covered case.
Details
- Category:
- Optics
- Object Number:
- 2000-1449
- Materials:
- speculum metal, wood, textiles and metal
- Measurements:
-
grating block: 7 x 76 x 75 mm
case, overall: 23 x 110 x 90 mm
- credit:
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
