Surveying Instruments and Techniques.

Surveying Instruments and Techniques.

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Caption: 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shown is a circumferentor, or surveyor's compass, an instrument used in surveying to measure horizontal angles, now superseded by the theodolite.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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Keywords: air level, base line, baseline, chain, circumferentor, compass, encyclopedia, foot level, gunners level, horizontal, horizontal angles, huygens level, plumb level, survey, surveyor, theodolite

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