Editing Spire of Dublin (section)

==Construction==
The first section was installed on 18 December 2002.<ref>{{cite web|url=http://www.irish-architecture.com/buildings_ireland/dublin/northcity/oconnell_street/spire_competition/introduction.html|title=The Dublin Spire Competition Winning Announcement|publisher=Archiseek.com|access-date=29 September 2008|url-status=dead|archive-url=https://archive.today/20080705180117/http://www.irish-architecture.com/buildings_ireland/dublin/northcity/oconnell_street/spire_competition/introduction.html|archive-date=5 July 2008}}</ref> Construction of the sculpture was delayed because of difficulty in obtaining planning permission and environmental regulations.<ref>{{cite web|url=https://www.architectsjournal.co.uk/home/judge-spikes-ritchies-dublin-millennium-spire/772731.article|title=Judge spikes Ritchie's Dublin Millennium Spire|work=The Architects' Journal|date=8 July 1999|access-date=18 April 2018}}</ref> The Spire consists of eight hollow stainless steel cone sections, the longest being {{convert|20|m|ft|abbr=on}}, which were installed on 21 January 2003.<ref>{{cite web |last1=Blaney |first1=Amy |title=Twenty things to know about the Spire as it turns 20 years old |url=https://www.independent.ie/regionals/dublin/dublin-news/twenty-things-to-know-about-the-spire-as-it-turns-20-years-old/42303278.html#:~:text=The%20Spire%20is%20made%20up%20of%20eight%20stainless%20steel%20cones%20stacked%20on%20top%20of%20one%20another%20to%20create%20a%20seamless%20structure.%20The%20longest%20section%20is%2020%20metres%20in%20length.%20The%20base%20is%203%20metres%20in%20diameter%20and%20narrows%20to%2015cm%20at%20the%20top. |website=Irish Independent |access-date=8 February 2024}}</ref> It is an elongated cone of diameter {{convert|3|m|ft|abbr=on}} at the base, narrowing to {{convert|15|cm|in|abbr=on}} at the top. The total weight of the eight sections amounts to 133.15 tonnes.<ref name=":0">{{Cite journal |last=Deavy |first=Cormac P. |last2=Allsop |first2=Andrew |last3=Jones |first3=Keith |date=16 August 2005 |title=The Spire of Dublin |url=https://www.ritchie.studio/wp-content/uploads/2011/02/IStructE-Paper.pdf |journal=The Structural Engineer |pages=20}}</ref> It features two [[tuned mass damper]]s inside the fifth section from the bottom,<ref name=":0" /><ref>{{cite web|url=http://www.publicart.ie/fileadmin/user_upload/PDF_Folder/The_Spire_of_Dublin_-_Science_and_Technology_in_Action.pdf|title=The Spire of Dublin|work=Public Art|access-date=18 April 2018}}</ref> designed by engineers Arup, to counteract sway. The steel underwent [[shot peening]] to alter the quality of light reflected from it.

The pattern around the base of the Spire is based on a [[core sample]] of rock formation taken from the ground where the spire stands and the DNA double helix.<ref name="Spire of Dublin">{{cite web|url=http://www.ianritchiearchitects.co.uk/projects/dublin/|title=Spire of Dublin|publisher=Ian Ritchie Architects|access-date=1 November 2016}}</ref> The pattern was applied by [[Abrasive blasting#Bead blasting|bead blasting]] the steel through rubber stencil masks whose patterns were created by [[Water jet cutter|water jet cutting]] based on core sample drawings supplied by the contractor.<ref>{{cite web|url=http://aqua-design.ie/CaseStudies/The%20Spire%20Waterjet.pdf|title=Case Study: The Spire WaterJet Cutting|publisher=Aqua Design|access-date=25 November 2012}}</ref> The design around the {{convert|10|m|ft|abbr=on}} lower part of the Spire was created by the architects making a 3D pattern model combining the core sample and double helix and then digitally translated to a 2D image drawing supplied to the contractor and used by specialists for cutting the masking material.<ref name="Spire of Dublin"/>

At dusk, the base of the monument is lit and the top {{convert|10|m|ft|abbr=on}}<ref name="Spire of Dublin"/> is illuminated through 11,884 holes through which [[light-emitting diode]]s shine.<ref>{{cite web|url=http://www.newsteelconstruction.com/wp/making-the-dublin-spire/|work=NewSteelConstruction.com|title=Making the Dublin Spire|date=1 May 2006|access-date=18 April 2018}}</ref>