Concave Rowland diffraction grating on speculum metal, grating area 53 x 23 mm, with scratched markings reading 'Plate prepared at the Astronomical / and Physical Instrument Works / of J A Brashear Allegheny, PA USA / 1894' and 'Ruled on Rowlands first [?] Engine / Johns Hopkins University / Baltimore Md USA / 1894', in wooden case marked 'V.210.' A paper label on the box marked in German indicates (according to the donor) that the grating came from Paschen's laboratory.
- Object Number:
case: 25 x 75 x 75 mm
grating block: 10 x 62 x 62 mm
- furnishing and equipment
- tools & equipment
- optical instrument
- optical instrument component
- diffraction grating
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
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