Hadleys Quadrant And Sextant, 1806
by Wellcome Images
Title
Hadleys Quadrant And Sextant, 1806
Artist
Wellcome Images
Medium
Photograph - Photograph
Description
Engraving of Hadley's quadrant and sextant, 1806. Sir Isaac Newton (1643-1727) invented the principle of the doubly reflecting navigation instrument (a reflecting quadrant), but never published it. Two men independently developed the octant around 1730 John Hadley (1682-1744), an English mathematician, and Thomas Godfrey (1704-1749), a glazier in Philadelphia. John Bird made the first sextant in 1757. The octant and later the sextant, replaced the Davis quadrant as the main instrument for navigation.
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April 5th, 2016
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