Editing Scafell Pike (section)

==Survey point==
Scafell Pike was used in 1826 as a station in the [[Principal Triangulation of Britain]] by the [[Ordnance Survey]] when they fixed the relative positions of Britain and Ireland. Angles between [[Slieve Donard]] in [[Northern Ireland]] and Scafell Pike were taken from [[Snowdon]] in [[Wales]] as were angles between Snowdon and Scafell Pike from Slieve Donard. Given the need for clear weather to achieve these very long-range observations ({{convert|111|mile|km}} to Slieve Donard), the Ordnance surveyors spent much of the summer camped on the respective mountain tops. Scafell Pike was not used as a station in the earlier part of the Principal Triangulation of Britain, even though ''Sca-Fell'' formed one corner of a Principal Triangle.<ref group=note>Absence of angles taken from one corner of some triangles was attributed to difficulties of access in the preface of the 1811 report by the Ordnance Survey.</ref> The Ordnance Survey's high precision [[theodolite]] was not taken to the summit until 1841.<ref name=Mudge/><ref name="Seymour">{{cite book|editor1-last=Seymour|editor1-first=W. A.|editor1-link=W. A. Seymour|title=A History of the Ordnance Survey|date=1980|publisher=Wm Dawson & Sons, Ltd|location=Folkestone, Kent|isbn=0-7129-0979-6|url=https://www.ordnancesurvey.co.uk/docs/ebooks/history-ordnance-survey.pdf}}</ref><ref>{{cite news|work=Carlisle Journal | title = Ordnance Trigonometrical survey  |url=http://www.britishnewspaperarchive.co.uk/viewer/BL/0000363/18411009/009/0002?browse=False|access-date=12 Jun 2017|date=9 Oct 1841|at= page 2, Col 8}}</ref>