Using a cross-staff to measure the height of a tower. From Robert Fludd "Utriusque cosmi … historia", Oppenheim, 1617-1619. Engraving

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
License: Licensed
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Keywords: /, 1617-1619., cosmi, cross-staff, engraving, fludd, height, historia, instrument, mathematical, measure, measurement, oppenheim, robert, surveying, tower, tower., utriusque, …