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Royal Irish Academy
Lunchtime Lectures
1 October 2014
The Ordnance Survey Six-Inch
Mapping Project: Political and
Cultural Agendas
Benchmarks :
1791 – Foundations of the O.S. in Britain.
1820 (to 1846) – Col. Thomas Colby appointed head of the O.S.
1824 – Decision to map the whole of Ireland at very large 6’’ scale; Colby
begins triangulation in the summer of 1825.
1825 – Separate Boundary Commission formed, led by Richard Griffith.
1828 (to 1846) – Lieut. (later Capt.) Thomas A Larcom in charge of O.S.
Headquarters in Ireland (Mountjoy House, Phoenix Park).
1830 – He establishes Topographical Department under George Petrie with
John O’Donovan, Eugene O’Curry, et.al.,
1830-31 – Revision of earliest surveyed counties required.
1833-46 – Publication of first edition six-inch maps for each county, from
Londonderry (1833) to Kerry (1846).
1837 – First (and only) County Memoir published.
1846 – Griffith’s Tenement Valuation begun.
1846(May) – Larcom removed from the O.S.
1846(Nov.) – Major-General Colby steps down as head of O.S.
{See Andrews(NB), Hewitt, Doherty, et.al.,}
Thomas Spring Rice: Liberal MP from
Limerick, in favour of reforms – including
Catholic Emancipation – in Ireland. Chair of
1824 Select Committee on Survey of
Ireland. Later Chancellor of the Exchequer
and involved in demise of Memoir.
Thomas Colby
Richard Griffith 1784-1878
The Principal Triangulation of
Ireland.
Districts and district offices of the 6-inch
detail survey
All numbered figures from J H Andrews (A Paper Landscape)
State of the 6-inch detail survey, 1830
1829 1832 1857
Need for revisions
Monaghan, part of 6’’ sheet 19,
1835-36
Part of 6’’ sheet 26 Co. Londonderry
Survey dates of completed
1st edition 6-inch sheets
Thomas Larcom
From G M Doherty
Eugene O’Curry
from G M Doherty
Fieldwork for the Memoir
Series 1830-1840
From G M Doherty
Clogheen – Burncourt before and after Famine
Civil Parishes as surveyed and
mapped by the Ordnance
Survey
Of Children under 5 yrs
1841 - 1851

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Prof. William Smith, MRIA 'The OS 6" mapping project: political and cultural agendas' 1-10-2014

  • 1. Royal Irish Academy Lunchtime Lectures 1 October 2014 The Ordnance Survey Six-Inch Mapping Project: Political and Cultural Agendas
  • 2. Benchmarks : 1791 – Foundations of the O.S. in Britain. 1820 (to 1846) – Col. Thomas Colby appointed head of the O.S. 1824 – Decision to map the whole of Ireland at very large 6’’ scale; Colby begins triangulation in the summer of 1825. 1825 – Separate Boundary Commission formed, led by Richard Griffith. 1828 (to 1846) – Lieut. (later Capt.) Thomas A Larcom in charge of O.S. Headquarters in Ireland (Mountjoy House, Phoenix Park). 1830 – He establishes Topographical Department under George Petrie with John O’Donovan, Eugene O’Curry, et.al., 1830-31 – Revision of earliest surveyed counties required. 1833-46 – Publication of first edition six-inch maps for each county, from Londonderry (1833) to Kerry (1846). 1837 – First (and only) County Memoir published. 1846 – Griffith’s Tenement Valuation begun. 1846(May) – Larcom removed from the O.S. 1846(Nov.) – Major-General Colby steps down as head of O.S. {See Andrews(NB), Hewitt, Doherty, et.al.,}
  • 3. Thomas Spring Rice: Liberal MP from Limerick, in favour of reforms – including Catholic Emancipation – in Ireland. Chair of 1824 Select Committee on Survey of Ireland. Later Chancellor of the Exchequer and involved in demise of Memoir.
  • 7. Districts and district offices of the 6-inch detail survey All numbered figures from J H Andrews (A Paper Landscape)
  • 8. State of the 6-inch detail survey, 1830
  • 9. 1829 1832 1857 Need for revisions Monaghan, part of 6’’ sheet 19, 1835-36 Part of 6’’ sheet 26 Co. Londonderry
  • 10. Survey dates of completed 1st edition 6-inch sheets
  • 11.
  • 13.
  • 14.
  • 15.
  • 16. From G M Doherty
  • 18. Fieldwork for the Memoir Series 1830-1840 From G M Doherty
  • 19.
  • 20. Clogheen – Burncourt before and after Famine
  • 21. Civil Parishes as surveyed and mapped by the Ordnance Survey
  • 22. Of Children under 5 yrs 1841 - 1851