Editing William Rowan Hamilton (section)

==Family==
Hamilton married Helen Bayly, daughter of Rev Henry Bayly, Rector of Nenagh, County Tipperary, in 1833; she was a sister of neighbours to the observatory.<ref>Graves (1885) Vol. II, p. 1</ref><ref name="Hankins"/>{{rp|108}} They had three children: the journalist [[William Edwin Hamilton]] (born 1834), Archibald Henry (born 1835) and Helen Eliza Amelia (born 1840).<ref>Graves (1882) Vol. I, p. xix</ref> Helen stayed with her widowed mother at Bayly Farm, [[Nenagh]] for extended periods, until her mother's death in 1837. She also was away from Dunsink, staying with sisters, for much of the time from 1840 to 1842.<ref>{{cite book |last1=Mollan |first1=Charles |title=It's Part of What We Are – Volumes 1 and 2 – Volume 1: Richard Boyle (1566–1643) to John Tyndall (1820–1893); Volume 2: Samuel Haughton (18210–1897) to John Stewart Bell (1928–1990): Some Irish Contributors to the Development of the Chemical and Physical Sciences |date=2007 |publisher=Charles Mollan |isbn=978-0-86027-055-3 |page=610 |url=https://books.google.com/books?id=cjnJDwAAQBAJ&pg=PA610 |language=en}}</ref> Hamilton's married life was reportedly difficult.<ref name="Bruno2003"/>{{rp|209}} In the troubled period of the early 1840s, his sister Sydney ran his household; when Helen returned, he was happier after some depression.<ref name="Hankins"/>{{rp|125, 126}}