Concave diffraction grating on speculum metal, gra

Made:
1926, May in Teddington
maker:
National Physical Laboratory

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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:
felt, metal, speculum metal and wood
Measurements:
case: 88 x 88 x 28 mm
grating block: 12 x 71 mm
type:
diffraction grating - reflection
taxonomy:
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • optical instrument component
  • diffraction grating
credit:
Imperial College of Science,Technology & Medicine (Spectroscopy Group)