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Science Source ftp Apr 2015

EN_01170126_0596
Science Source ftp Apr 2015
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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.
2015-04-07
East News
Science Source
Science Source
BV5451
1,63MB
29cm x 29cm by 300dpi
1723, ALIGNED, APPARATUS, ART, ARTWORK, ASTRONOMICAL, ASTRONOMY, BACKGROUND, BEEN, BEING, BODY, BRING, BY, DEVICE, DRAWING, ENGRAVING, FAMOUS, GRADUALLY, HAD, HADLEY, HEAVENLY, HEIGHT, HISTORIC, HISTORICAL, HISTORY, HORIZON, ILLUSTRATION, IMAGE, IMPORTANT, IMPROVED, IN, INSTRUMENT, JOHN, MARITIME, MEASURE, MEASUREMENT, MEASURING, MIRRORS, NAUTICAL, NAVIGATION, NAVIGATIONAL, NAVIGATORS, NOTABLE, OBERVED, OF, OFF, ON, ONE, OTHER, PROVIDED, QUADRANT, READ, SCALE, SCIENCE, SOURCE, THE, TO, TOOL, TWO, WAS, WELL-KNOWN, WHICH, WHITE, WHO,