TY  - GEN
T1  - 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.
DA  - [1775?]
CY  - London :
AU  - Martin, Benjamin,
PB  - printed for the author, at No. 171, Fleet-Street,
PP  - London :
PY  - [1775?]
N1  - "The public are indebted solely to my son, J.L. Martin, for the invention .." (Preface); he was awarded patent no. 1088 in 1774.
N1  - Price from imprint: price 1s. 6d.
N1  - Reproduction of original from British Library.
ID  - 570088
KW  - Sextant.
KW  - Nautical instruments.
KW  - Astronomical instruments.
TI  - 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.
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ER  -