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8. A Complete Map
The origin of the Ordnance Survey in Ireland.
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7. “La différence”
Paris and Greenwich, science and rivalry, and the measurement of position. The Great Trigonometric Survey of…
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6. The Isles of Scilly
Longitude, navigation, and the consequences of being in the wrong place. “Farewell and Adieu to You,…
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5. Navigation, Napoleon, and “Normalisation”
The arrival of the Ordnance Survey in Ireland against a broader political, military, and administrative background.…
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4. Inside Mountjoy House
Crossing the Threshold: An Ambition for Change in the Survey. The front of the big house…
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3. Where the Gas Lamps End
Echoes of the past – “where the technically minded visitor discovered an outpost of an earlier…
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2. “This Admirable House”
Luke Gardiner, 1st Viscount Mountjoy (1745-1798), painted by Sir Joshua Reynolds. Source Wikipedia “A young man…
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1. Ghosts of Mountjoy
The ghosts of Mountjoy and my arrival in the Phoenix Park. I turned off the light,…
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Abbreviations
Published 10 January 2026 I have tried to keep these to a minimum. OS Ordnance Survey…
