Man Using a Circumferentor

Illustration of a man using a circumferentor, or surveyor's compass, a forerunner of the theodolite (a more sophisticated sextant that can measure both a horizontal and a vertical angle through a full 360o), from an illustrated book on cosmography by Jacques de Vaulx (or Devaulx), a pilot of Le Havre, called, Les Premieres Euvres de Jacques de Vaulx, pillote en la Marine, 1583

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Compass Diagram Measuring Navigating Navigational Sextant Surveyor Surveyors

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