Navigational Instruments

Navigational Instruments

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Credit: DAVID PARKER/SCIENCE PHOTO LIBRARY

Caption: Plate from 18th century encyclopedia showing various navigational instruments. Such instruments are used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction etc. to arrive at the port or point of destination. Including in the illustration are; compass, azimuth compass, knights compass, dipping needle, backstaff, forestaff, hadley's quadrant, astolabe, and various sunisighting diagrams.

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Keywords: and various sunisighting diagrams., astolabe, azimuth compass, backstaff, compass, dipping needle, encyclopedia, forestaff, hadley's quadrant, knights compass

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