Dunkirk-Barcelona triangulation charts

Here are the maps created by French surveyors in the face of extreme weather, demolished triangulation points (church spires had a bad time) and bloodthirsty mobs in order to calculate, with what we now know was an extraordinary degree of accuracy, the physical length of the 1791 commission’s definition of the metre as one ten millionth of the distance from the North Pole to the Equator. How many of the points in image 8 can you place?

(Walks here and here.)

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