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0460000613

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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Irish Photo Archive
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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