Concave diffraction grating on speculum metal

Made:: 1926, May in Teddington

maker:: National Physical Laboratory

$Concave diffraction grating on speculum metal$

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Concave diffraction grating on speculum metal
Science Museum Group
© The Board of Trustees of the Science Museum

Concave diffraction grating on speculum metal, grating area 53 x 38 mm, with scratched markings 'N.P.L. / BLYTHSWOOD RULING / RULED MAY 1926 / No. 53837', in velvet lined wooden case marked V379. German typescript label in case indicates that radius is 100 cm and grating has 14402 lines per inch. A paper label marked in German indicates (according to the donor) that the grating came from Paschen's laboratory.

Details

Category:: Optics

Object Number:: 2000-1450

Materials:: speculum metal, wood, felt and metal

Measurements:: case: 88 x 88 x 28 mm
grating block: 12 x 71 mm

type:: diffraction grating - reflection

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

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