An explanation of a new construction and improvement of the sea octant and sextant

Publication Date1775
Remaindercontaining, 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
Extent[2],37,[1]p., fold.plates
Publisherprinted for the author, at No. 171, Fleet-Street



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