diffraction grating on speculum metal, gra

Made:: 1881 in New York and United States

maker:: D C Chapman; Lewis Morris Rutherfurd

modifier:: Adam Hilger

$Diffraction grating on speculum metal, grating area 44 x 42 mm$

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Diffraction grating on speculum metal, grating area 44 x 42 mm
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

type:: diffraction grating - reflection

credit:: Imperial College of Science,Technology & Medicine (Spectroscopy Group)

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