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Model of the Great Rosse Telescope, 1842-1845

Model of the Great Rosse Telescope, 1842-1845

1844-1845
Telescope Eyepiece from Great Rosse Telescope, 1845-1850

Telescope Eyepiece from Great Rosse Telescope, 1845-1850

1845-1850
Retaining clip for the Mirror for the Great Rosse Telescope

Retaining clip for the Mirror for the Great Rosse Telescope

1844-1846
Bed of Iron Hoops

Bed of Iron Hoops

1840-1850
Six-foot speculum [metal] mirror on travelling carriage from the Great Rosse Telescope, the 'Leviathan of Parsonstown', built by the Third Earl of Rosse at Birr, Ireland, 1844-46.

Mirror for the Great Rosse Telescope, 1844-1846

1844-1846
Six-foot speculum [metal] mirror on travelling carriage from the Great Rosse Telescope, the 'Leviathan of Parsonstown', built by the Third Earl of Rosse at Birr, Ireland, 1844-46.

Mirror for the Great Rosse Telescope, 1844-1846

1844-1846
An illustration of the Great Nebula in Orion in glazed frame by the Third Earl of Rosse.

An illustration of the Great Nebula in Orion

1860-1867
Experimental speculum of 6 inches aperture and 24 inches focal distance, cracked across and bound together with string

Experimental speculum of 6 inches aperture and 24 inches focal distance

1840-1870
Experimental compound speculum mirror of 2 feet diameter, made by the 3rd Earl of Rosse. The 9 segments of speculum metal, are held in an alloy of copper and zinc.

Experimental compound speculum mirror of 2 feet diameter

1840-1845
Original "Finder" eyepiece of the six-foot Rosse telescope

Original "Finder" eyepiece

1845-1850
Grinding tool used with 6-foot speculum mirror by Lord Rosse

Grinding tool used with 6-foot speculum mirror

1840-1850
Metal cover for oval shaped secondary speculum mirror from the 6-foot Rosse telescope

Cover for speculum mirror

Almost complete section of curved wooden plank from the tube of Lord Rosse's 72-inch reflecting telescope. Removed during the restoration of the instrument durin 1996-7 and presented to the Science Museum by the 7th Earl of Rosse.

Section of wooden plank from Rosse's reflecting telescope

1843-1845
Two profile gauges, concave and convex which were used by the 3rd Earl of Rosse to measure the 72 inch mirrors used on the largest Rosse telescope.

Two profile gauges

1844-1845
Oval shaped secondary speculum mirror from the 6-foot Rosse telescope

Oval shaped secondary speculum mirror

One of two profile gauges with convex profile which was used by the 3rd Earl of Rosse to measure the 72 inch mirrors used on the largest Rosse telescope.

Profile gauge with convex profile

1844-1845
One of two profile gauges with concave profile which was used by the 3rd Earl of Rosse to measure the 72 inch mirrors used on the largest Rosse telescope.

Profile gauge with concave profile

1844-1845
Polishing tool used with 6-foot speculum mirror by Lord Rosse

Polishing tool used with speculum mirror

1840-1850
Oval shaped secondary speculum mirror with cover, from the 6-foot Rosse telescope

Oval shaped secondary speculum mirror with cover

1845-1850