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.
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.
Size: 3381px × 3444px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: -, apparatus, art, artwork, astronomical, astronomy, background, device, drawing, engraving, famous, hadley, historic, historical, history, illustration, important, instrument, john, maritime, measure, measurement, measuring, nautical, navigation, navigational, navigators, notable, quadrant, science, tool, white
