Concave Rowland diffraction grating on speculum metal
- Made:
- 1882, Nov 6 in Baltimore and Allegheny City
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Concave Rowland diffraction grating on speculum metal, grating area 80 x 52 mm, with scratched markings reading 'Ruled on Rowland's machine / Johns Hopkins University Baltimore / 14438 lines to inch / to Capt. Abney / with kind regards / H. A. Rowland, Nov. 6 1882', almost certainly on a plate prepared in J. A. Brashear's works, with remnant of film used for cleaning grating on part of surface.
Details
- Category:
- Optics
- Object Number:
- 2000-1448
- Materials:
- speculum metal
- Measurements:
-
overall: 14 x 102 x 100 mm
- credit:
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
