... North and South Meridian Markers before restoration . ... From the Observatory Minute Book for 6 Oct 1948, p.2: "South meridian mark repaired, substituted a massive iron ring for the former copper one. ... One, the northern mark, at Tullyards, just off the Armagh-Loughall Road, is an arch-shaped structure surmounted by two pinnacles. ... A second meridian mark of similar design was built to the south of the Observatory at Corkley but was destroyed in the 19th century. ...