Surveyor's Crosses by Pomodoro, Stevin, and Bion, Octagonal Surveyor's Cross, Staff Combination by Da Vinci. Original caption: From: Surveying Instruments, Their History and Classroom Use, by Edmund Kiely, , Bureau of Publications, Teachers College, Columbia University, New York 1947.
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Photo credit: © NB/PR / Alamy / Afripics
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