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.

Format:

Book

Author/Creator:

Martin, Benjamin, 1705-1782.

Language:

English

Subjects (All):

Sextant.

Nautical instruments.

Astronomical instruments.

Physical Description:

1 online resource ([2],37,[1]p., fold.plates )

Other Title:

Explanation of a new construction and improvement of the sea octant and sextant,

Place of Publication:

London : printed for the author, at No. 171, Fleet-Street, [1775?]

Notes:

"The public are indebted solely to my son, J.L. Martin, for the invention .." (Preface); he was awarded patent no. 1088 in 1774.

Price from imprint: price 1s. 6d.

Reproduction of original from British Library.

Cited in:

English Short Title Catalog, T25321.

OCLC:

642555373