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
Picture No
10803044
Media ID
47603139
Size
3381px x 3444px
(1.9MB)
Credit
©Photo Researchers / Mary Evans Picture Library
Source
Photo Researchers
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Restrictions Only for Ireland and United Kingdom
Astronomical Hadley Measure Quadrant
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