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Hadley's Quadrant and Sextant, 1806

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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Title:
Hadley's Quadrant and Sextant, 1806
Caption:
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.
Credit:
Album / Science Source / Wellcome Images
Releases:
Model: No - Property: No
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Image size:
3957 x 2311 px | 26.2 MB
Print size:
33.5 x 19.6 cm | 13.2 x 7.7 in (300 dpi)
Keywords: