Plate from 18th century encyclopedia showing illustrations of various surveying instruments and techniques. Diagrams show the use of chains to measure

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Plate from 18th century encyclopedia showing illustrations of various surveying instruments and techniques. Diagrams show the use of chains to measure baselines. Also shown is a circumferentor, or surveyor's compass, an instrument used in surveying to measure horizontal angles, now superseded by the theodolite. At the bottom various levels are illustrated including; air level, foot level, Huygens level, gunners level and plumb level.

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Size: 4539px × 7144px
Photo credit: © DAVID PARKER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: air, angles, base, baseline, chain, circumferentor, compass, encyclopedia, foot, gunners, horizontal, huygens, level, line, plumb, survey, surveyor, theodolite