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.
- Object Number:
grating block: 7 x 76 x 75 mm
case, overall: 23 x 110 x 90 mm
- furnishing and equipment
- tools & equipment
- optical instrument
- optical instrument component
- diffraction grating
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
- Permanent collection
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