Experimental speculum of 6 inches aperture and 24 inches focal distance

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

Materials:: speculum metal (bronze alloy)

Measurements:: overall: 70 x 180 mm

type:: components, concave mirrors, metal mirrors and astronomical instruments

credit:: Lord Rosse (4th Earl)

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Experimental speculum of 6 inches aperture and 24 inches focal distance

Details

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