HADLEY'S QUADRANT OCTANT SEXTANT Britain, 18th Century London". Mahogany "T-frame" and radius arm with clamp. Index with a 90-degree arc; diagonal scale for dividing the increments on the index scale. This Quadrant patented in 1734 by John Hadley was adopted by most British Octant is a navigational positioning device. Invented by Isaac Newton and perfected by John Hadley and Thomas Godfrey in 1742, it aligned the horizon and the stars more efficiently and was easier, quicker and more accurate to use than previous navigation instruments.

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Size: 3634px × 4608px
Photo credit: © Ian Shaw / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -frame, 1734, 18th, adopted, britain, british, century, early, gps, hadley, hadleys, john, london., mahogany, navigators, octant, patented, quadrant, sextant, system