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12. The Lough Foyle Baseline
It started with a measured line on the ground, “on which the credit of the whole…
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11. Accuracy Once Lost Cannot Be Recovered
Why Colby’s System Still Matters. When Thomas Colby directed the Ordnance Survey in the nineteenth century,…
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10. Colby’s System
Colby devised a system of working for the Irish Survey that prioritised quality and accuracy over…
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9. Thomas Colby
The surveyor whose drive, determination and insistence on accuracy left a durable and long-lasting mark on…
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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…
