Concept
Sextant
Catalogue
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An explanation of a new construction and improvement of the sea octant and sextant, containing, A most easy, expeditious and accurate Method of adjusting and rectifying those Instruments for Use both at Sea and Land. Also the best Disposition of the Glasses; with Directions for making the Fore and Back Observations; and the several Steps in the Process of finding the Longitude at Sea. Illustrated by four Copper-Plates. By B. Martin.
Martin, Benjamin, 1705-1782.Date: [1775?]- Books
Catálogo crítico de astrolabios existentes en España / [Salvador García Franco].
García Franco, Salvador, 1884-Date: 1945- Books
- Online
Description, use, and method of adjusting Hadley's quadrant and sextant. By George Adams, Mathematical instrument maker to His Majesty, and optician to His Royal Highness the Prince of Wales.
Adams, George, 1750-1795.Date: M.DCC.LXXXIX. [1789]