Objective lens (4-inch) of around 30 feet focal l

Made:
1930-1939 in Newcastle upon Tyne
maker:
Sir Howard Grubb, Parsons and Company

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Objective lens (4-inch) of around 30 feet focal length with wooden case and marked, 'GRUBB-PARSONS No.5104 4 INS. APERTURE 30 FT FOCUS', unsigned, 1930-1939.

Details

Category:
Astronomy
Object Number:
2001-682
Materials:
brass, complete, glass and wood
type:
objective lenses
credit:
University of Oxford (Dept of Physics)