17. Chapter 4: Introduction Chapter 4: Triangulation, limelight, human endurance and one of the “Ghosts” of Mountjoy, Thomas Drummond. How a hidden framework of measurement shaped the map of Ireland. Slieve Snaght…

Thank you, Professor Lilley. My next post, about the first triangulation behind the map of Ireland, is now online. Please see here: fromlimelighttosatellite.com/2026/04/03/1...

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