Diffraction Grating, Rowland & Goniometer |
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| Diffraction grating of 14,437 lines/inch x 3 1/4 inch. Set in goniometer. “The grating is a ruling of 14,437 lines/inch by Rowland, on a concave spherical speculum mirror of 4-1/2 inch aperture and 10 ft radius. First order dispersion is 5.5 A per mm.” (see RTW Bigham: ‘Concave Roland Grating: Eagle Mounting” in ‘Inspection of New Wing’; Appendix B5 , Vol 2 of Laby :CollectedPapers. The remnants of the Eagle Mounting, featuring a 4 inch tube x 10 ft long, presently uncatalogued, lies on the roof of a display cabinet in the PSB basement open cage-store. |
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Three Dimensional Object (requires Quicktime):
3-2.obj |
Three Dimensional Object (requires Quicktime):
3-1.obj |
Registration number: 3 |
Database ID: 3 |
Maker's details: Speculum metal blanks made by John H. Brashear(1840-1920) from John Hopkins University in Baltimore, Diffraction Grating made by Prof. H.A. Rowland, [School of Physics, University of Melbourne.] |
Where made country: U.S.A. |
When made approximate: ?1930s |
When used approximate: ?1930s |
Material: Brass glass |
Method of production used for Museum Item: manufactured |
Size in cm (H x L x D): H20 x Diameter 20 |
Inscriptions and markings: Kirkpatrick & Co., London |
References: See reference to RTW Bingham below, No known publications using the Eagle mounting. May have been used exclusively for practical work in Physics III. |
