Old Map of Surrey, 1811 - First Triangulation Ordnance Survey Chart - Hills, Castles, Steeples atlas map and general horsey facts

and general horsey facts

This is the first map ever printed to show King's College (now Columbia University) at its original site in Lower Manhattan

before it was turned into suburbs

Bowness-On-Windmere

Old Map of Surrey, 1811 - First Triangulation Ordnance Survey Chart - Hills, Castles, Steeples atlas map and general horsey factsA hugely important, rare and interesting map of Surrey from 1811, created by the Ordnance Survey, which was only a few years old at the time. This is literally a map of triangles but they're very important triangles. They're highly accurate triangles between various points of Surrey, measured using theodolites. These measurements, using Pythagoras's theorem and a bit of clever interpolation to take the Earth's curvature into account, would lead to the