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Dunsink Observatory
The Dunsink Observatory is an astronomical observatory established in 1785 in the townland of Dunsink near the city of Dublin, Ireland.〔Alexander Thom, (''Irish Almanac and Official Directory'' ) 7th ed., 1850 p. 258. Retrieved: 2011-02-22.〕
Its most famous director was William Rowan Hamilton, who, amongst other things, discovered quaternions, the first non-commutative algebra, while walking from the observatory to the city with his wife. He is also renowned for his Hamiltonian formulation of dynamics. In the late 20th century, the city encroached ever more on the observatory, which compromised the seeing. The telescope, then no longer state of the art, was used mainly for public 'open nights'.
==History==
The site was established on the south slope of a low hill in the townland of Dunsink, 84m above sea level.〔(Ordnance Survey Map ). Select ''Wind Report'' for elevation. Retrieved: 2011-02-22.〕 The South Telescope or 12 inch Grubb, is a refracting (uses lens) telescope built by Thomas Grubb of Dublin, completed in 1868.〔(The South Telescope of Dunsink Observatory ) Authors: Wayman, P. A. Journal: Irish Astronomical Journal, vol. 8(8), p. 274 Bibliographic Code: 1968IrAJ....8..274W〕 The achromatic lens, with an aperture of 11.75 inches, was donated by Sir James South in 1862, who had purchased the lens from Cauchoix of Paris 30 years earlier.〔(''History of the Cauchoix objective'' )〕 He had intended it for a large but troubled equatorial that came to fruition in the 1830s, but was dismantled around 1838.〔Dictionary of National Biography, 1885-1900, Volume 53, "South, James", by Agnes Mary Clerke (WikiSource 2010)〕 (See also Great refractors)
The entry for the observatory in ''Thom's Directory'' (1850) gives the following account of the observatory,
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