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Triangulation
Georgius Agricola, De Re Metallica, Triangulation
Triangulation with a hinged staff. From Sebastian
Using a quadrant with a plumb bob to calculate
Cross-staffs used for surveying: in this case
Measuring the distance of an inaccessible object
Using a quadrant with a plumb bob to calculate
Astrolabe, 15th Century
Using the Astrolabe, 17th Century
Gemma Frisius, Dutch Polymath
Observation of Sun with Astrolabe, 1545
Georgius Agricola, De Re Metallica, Triangulation
Alexis Carrel, French Surgeon and Eugenicist
Alexis Carrel, French Surgeon
Alexis Carrel, French Surgeon and Eugenicist
Astrolabe
Alexis Carrel, French Surgeon and Eugenicist
Gemma Frisius, Dutch Polymath
Gemma Frisius, Dutch Polymath
The Surveyor
Surveying. Gemma Frisius's 1533 diagram ?
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