reflection diffraction grating on speculum metal

Made:: 1879 in New York

maker:: D C Chapman

$reflection diffraction grating on speculum metal$

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reflection diffraction grating on speculum metal
Science Museum Group
© 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

type:: diffraction grating - reflection

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reflection diffraction grating on speculum metal

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