explanation of a new construction and improvement of the sea octant and sextant, containing, a ... method of adjusting and rectifying those instruments for use both at sea and land .... illustrated by four copper-plates
By: by B. Martin.
Publisher: printed for the author
Published: 1775
Place of publication: London
Language: eng
Number of pages: 37
Notes: "The public are solely indebted to my son, J.L. Martin, for the invention .." (Preface); he was awarded patent no. 1088 in 1774.

ESTCT25321.

Microfilm. Woodbridge, CT : Research Publications, Inc. 1983. 1 reel ; 35mm. (The Eighteenth Century ; reel 628, no. 18).