Editing Armagh Observatory (section)

== Instruments ==

A 2½ inch aperture refracting telescope by J & E [[Edward Troughton|Troughton]] was installed in a dome in 1795.<ref name=":6">{{Cite book|title=Troughton, Thomas|date=2011-10-31|publisher=Oxford University Press|series=Benezit Dictionary of Artists|doi = 10.1093/benz/9780199773787.article.b00185568}}</ref> The telescope was manufactured in London, and is noted for its late 18th century [[brass]] metal work.<ref name=":6" /> It is also known the Troughton Equatorial Telescope, for having an [[equatorial mount]]ing.<ref name=":6" />

The observatory has an Earnshaw Regulator.<ref name=":6" /> It is an accurate type of clock invented in 1791 by [[Thomas Earnshaw]].<ref>{{Cite book|url=https://archive.org/details/treasuresofpower00meas|url-access=registration|quote=Earnshaw Regulator.|title=Treasures of the Powerhouse Museum|last1=Measham|first1=Terry|last2=Museum|first2=Powerhouse|date=1994-01-01|publisher=Powerhouse Publishing|language=en}}</ref> Earnshaw travelled with it to Armagh to set it up in the new Observatory.

In the early 1800s it was reported to have a [[mural circle]] instrument.<ref>{{Cite book|url=https://books.google.com/books?id=Iy_sAAAAMAAJ&q=Armagh+Observatory&pg=PA17|title=Memoirs of the Royal Astronomical Society|last=Society|first=Royal Astronomical|date=1836|publisher=Priestley and Weale|language=en}}</ref> Another instrument at the observatory is a [[sunshine recorder]].<ref name=":0" />

In the 1830s the observatory bought a 15-inch reflecting telescope from the [[Grubb Telescope Company]].<ref name="Butler">{{cite journal |last1=Butler |first1=C. J. |title=The 15-inch Equatorial Reflector by Thomas Grubb at Armagh Observatory |journal=Bulletin of the Scientific Instrument Society |date=June 2016 |issue=129 |pages=2–9 |url=https://scientificinstrumentsociety.org/BulletinArticles_public/Bulletin129_Butler,C.J._15-inch-equatorial-by-Thomas-Grubb.pdf}}</ref> The telescope used a [[Speculum metal|speculum metal mirror]] mounted on an equatorial mount with clockwork-drive.<ref name=Butler />

In 1885, a ten-inch aperture refracting telescope was installed, also by Grubb.<ref name=":2">{{Cite web|url=https://www.sciencephoto.com/media/663882/view/armagh-10-inch-refractor-telescope-1885|title=Armagh 10-inch refractor telescope, 1885 - Stock Image - C025/0064|website=Science Photo Library|access-date=2019-10-31}}</ref> This was installed in the Robinson dome.<ref name=":2" />

Meridian marks can be found in the vicinity of the observatory, these look like stone arches, but were used to mark the location of the north-south line for the astronomical instruments. There is also another one in the form of an iron obelisk. The first meridian mark was built in 1793, and is in Tullyard, and it was used with the transit instrument.<ref name=":3">{{Cite journal |last=Butler |first=John |date=2016-04-01 |title=Armagh Observatory's meridian marksARMAGH OBSERVATORY |url=https://academic.oup.com/astrogeo/article/57/2/2.27/2468648 |journal=Astronomy & Geophysics |language=en |volume=57 |issue=2 |pages=2.27–2.31 |doi=10.1093/astrogeo/atw073 |issn=1366-8781 |doi-access=free|url-access=subscription }}</ref>

In 2005, two wide-angle cameras for a meteor detection systems were installed.<ref>{{Cite book|url=https://books.google.com/books?id=2Y3POvMXDcgC&q=Armagh+Observatory&pg=PA263|title=Advances in Meteoroid and Meteor Science|last1=Trigo-Rodriguez|first1=J. M.|last2=Rietmeijer|first2=F.|last3=Llorca|first3=Jordi|last4=Janches|first4=D.|date=2008-03-21|publisher=Springer Science & Business Media|isbn=9780387784199|language=en}}</ref>