Experimental speculum of 6 inches aperture and 24

Made:
1840-1870 in Birr
maker:
William Parsons

Experimental speculum of 6 inches aperture and 24 inches focal distance, cracked across and bound together with string

Details

Category:
Astronomy
Object Number:
1876-564
type:
metal mirrors
credit:
Lord Rosse (4th Earl)

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