Practijck des landmeten

Illustration from the book Practijck des landmeten by Jan Pietersz.ย Dou and Johan Sems (1600).ย The image uses quadrants with which an angle of up to 90 degrees could be measured.ย To remove this limitation, Dou would later invent the Hollandse Circle, which was used until the end of the 18th century.

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