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This instrument is made only by Thomas Heath, at the Hercules, next to the Fountain Tavern in the Strand, having the patterns corrected by the translator
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The sea officers companion
being an appendix to Waddington's Navigation; (which makes it a complete system of that art) containing several methods of obtaining the latitude of a place either at Sea or on Land, both by Sun and Moon. The Variation of the Needle, Obtained by the Moon. A Table of the Limits of the Times for taking the Altitudes of Sun or Moon, in order to obtain the Latitude from Two Altitudes and the Time Elapsed. The Method of obtaining the Longitude at Sea, and of computing the Observations in a concise and easy Manner. The Nature and Principle of Refraction and Reflection, as Defined by Sir Isaac Newton. Tables of Refraction, and Parallax of the Moon at All Altitudes, illustrated. The Solar System Described. The Method of using Artificial Horizons both at sea and land. The Method of using Artificial Horizons both at sea and land. The Method of Surveying Coasts and Harbours, with Copper-Plate Plans for the Illustration. By R. Waddington, Teacher of Mathematics, Surry-Side, Westminster-Bridge -
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 -
Of the reflecting sextant, and its use at sea
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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