Accession No

2797

Brief Description

diffraction grating, reflecting, Rowland-type, by Theodore Schneider, U.S.A., c. 1900

Origin

U.S.A.; Baltimore, MA

Maker

Schneider, Theodore [ruled using Rowland's engine]

Class

optical

Earliest Date

1900

Latest Date

1900

Inscription Date

Material

speculum metal; wood; metal; brass

Dimensions

box length 196mm; breadth 175mm; height 85mm; grating breadth 137mm; length 161mm; height 28mm

Special Collection

Provenance

Transferred from Institute of Astronomy, University of Cambridge, Cambridge, England, 14/09/1981.

Inscription

‘Ruled by Schneider on Rowlands engine
14438 lines to in.
Johns Hopkins University, Baltimore’ (grating)
‘Grating
(Schneider)
(used 1949/51 in the McClean spectr.)
investigated by knife edge
and by Ronchi test - kinoir [?]’ (paper label on lid of box)

Description Notes

Diffraction grating, reflecting, Rowland-type, by Theodore Schneider, U.S.A., c. 1900.

Speculum metal plate with raised polished surface containing rectangular ruled surface. Fitted tray in fitted wooden box.
Box also includes two wrapped pieces of cottonwool.

Inscribed with the following:

‘Ruled by Schneider on Rowlands engine
14438 lines to in.
Johns Hopkins University, Baltimore’ (grating)
‘Grating
(Schneider)
(used 1949/51 in the McClean spectr.)
investigated by knife edge
and by Ronchi test - kinoir [?]’ (paper label on lid of box)

Condition good; complete

References

Events