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DEPT. Jones, William, 1763-1831. *XE The description and use of the sea octant, -795 commonly called Hadley's quadrant; wherein its .J72D use is exemplified by proper examples and tables,
and an account given of the new additional ap- paratus that are applied to it, for determining the latitude and longitude with the greatest possible accuracy. To which is annexed, A demon- stration of the theory of this excellent instru- ment. The second edition corrected. By William JONES we.
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