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Drawing of Lord Rosse's machine

1915

Telescope Eyepiece from Great Rosse Telescope, 1845-1850

1845-1850

Model of the Great Rosse Telescope, 1842-1845

1844-1845
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
Two photographs (silver prints) showing views of the Great Rosse from both the south- west and south-east. Both were taken about 1880 by Lieutent-Colonel Harry J. Watson, seen in one photograph seated on the ladder, whilst he was posted to nearby Newbridge.

Photographs of the Great Rosse

1880
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
Photograph (silver print) showing the 3-foot Rosse Telescope with later equatorial mounting from the eastern side. Taken about 1880 by Lieutent-Colonel Harry J. Watson who was posted to nearby Newbridge.

Photograph showing the 3-foot Rosse Telescope

1880
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
One of two photographs (silver prints) of the Great Rosse Telescope taken from the south east. Taken about 1880 by Lieutent-Colonel Harry J. Watson, whilst he was posted to nearby Newbridge.

Photograph of the Great Rosse Telescope, 1880

1880
Grinding tool used with 6-foot speculum mirror by Lord Rosse

Grinding tool used with 6-foot speculum mirror

1840-1850
Polishing tool used with 6-foot speculum mirror by Lord Rosse

Polishing tool used with speculum mirror

1840-1850
Original "Finder" eyepiece of the six-foot Rosse telescope

Original "Finder" eyepiece

1845-1850
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
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
Oval shaped secondary speculum mirror with cover, from the 6-foot Rosse telescope

Oval shaped secondary speculum mirror with cover

1845-1850
One of two photographs (silver prints) of the Great Rosse Telescope from the southwest. Taken about 1880 by Lieutent-Colonel Harry J. Watson, seen seated on the ladder, whilst he was posted to nearby Newbridge.

One of two photographs (silver prints) of the Great Rosse Telescope from the southwest

1880
Bed of iron hoops used for casting three-foot speculum mirror by Lord Rosse

Bed of iron hoops

1840-1850