Cross-staffs used for surveying: in this case for measuring the width of a river by triangulation

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Cross-staffs used for surveying: in this case for measuring the width of a river by triangulation

Cross-staffs used for surveying: in this case for measuring the width of a river by triangulation. From Sebastian Munster Rudimenta Mathematica, Basle, 1551. Woodcut

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Media ID 9788765

© Universal History Archive/Universal Images Group

1551 Basle Case Instrument Mathematica Mathematical Measurement Measuring Munster River Sebastian Surveying Triangulation Woodcut Width

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EDITORS COMMENTS
This print showcases the ancient technique of surveying with cross-staffs, specifically used here to measure the width of a river through triangulation. The image is taken from Sebastian Munster's Rudimenta Mathematica, published in Basle in 1551. The woodcut illustration beautifully captures the intricacy and precision involved in this early form of measurement. The cross-staffs, an essential instrument for surveyors at that time, are depicted with great detail. These long wooden poles feature perpendicular arms that intersect at right angles, allowing for accurate measurements. In this particular case, the surveyor uses the cross-staffs to determine the width of a river by employing triangulation techniques. By measuring two known distances on either side of the riverbank and using trigonometry principles, they can calculate its width accurately. Sebastian Munster's work was highly influential during his time as it laid down fundamental mathematical concepts still used today. This woodcut serves as a testament to both his expertise and dedication to advancing scientific knowledge. This remarkable print not only provides us with a glimpse into historical surveying practices but also reminds us of humanity's continuous quest for understanding our surroundings through precise measurement methods.

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