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Three-prism solar spectroscope with automatic prism adjustment for minimum deviation and a fixed equatorial mounting with drive by Howard Grubb, Dublin, dated 1871. Supplied by the Royal Society of London to J.B.N.Hennessey who used the instrument at Vincent Hill, Dehra Dun in the Indian foothills [7,000 ft.] of the Himalayas to map the solar spectrum between 1871-5.

Solar spectroscope by Howard Grubb, Dublin, 1871

1871

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

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

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

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

Original "Finder" eyepiece

1845-1850

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