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Historical Quadrant

The quadrant, which was gradually improved by John Hadley, who, in 1723, provided two mirrors, one to bring the image of the heavenly body being oberved to the horizon, which had been aligned on the other. The height was read off the scale.
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Title:
Historical Quadrant
Caption:
The quadrant, which was gradually improved by John Hadley, who, in 1723, provided two mirrors, one to bring the image of the heavenly body being oberved to the horizon, which had been aligned on the other. The height was read off the scale.
Credit:
Album / Science Source / New York Public Library
Releases:
Model: No - Property: No
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Image size:
3381 x 3444 px | 33.3 MB
Print size:
28.6 x 29.2 cm | 11.3 x 11.5 in (300 dpi)
Keywords:
APPARATUS • ART • ARTWORK • ASTRONOMICAL • ASTRONOMY • CELEBRITY • DEVICE • DRAWING • ENGRAVING • FAMOUS • HADLEY • HISTORIC • HISTORICAL • HISTORY • ILLUSTRATION • IMPORTANT • INSTRUMENT • JOHN HADLEY • MARITIME • MEASURE • MEASUREMENT • MEASURING • NAUTICAL • NAVIGATION • NAVIGATIONAL • NAVIGATORS • NOTABLE • QUADRANT • SCIENCE • TOOL • WELL-KNOWN • WHITE BACKGROUND