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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.

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.

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Created: 12 May 2003
Authorised by: Head, School of Physics
Maintained by: Museum Curator (pslyons @