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THE

THEORY AND PRACTICE

OF FINDING THE

LONGITUDE

AT SEA OR LAND:

TO WHICH ARE ADDED,

VARIOUS METHODS OF DETERMINING

THE LATITUDE OF A PLACE,

AND

VARIATION OF THE COMPASS;

WITH

NEW TABLES.

BY

ANDREW MACKAY, LL. d. f. r. s. Edin.

HONORARY MEMBER OF THE LITERARY AND PHILOSOPHICAL SOCIETY OF NEWCASTLE-
UPON TYNE, AND MATHEMATICAL EXAMINER TO THE HONOURABLE

THE CORPORATION OF TRINITY-HOUSE, THE HONOURABLE
THE EAST INDIA COMPANY, CHRIST'S HOSPITAL, ETC.

IN TWO VOLUMES.

THE THIRD EDITION, IMPROVED AND ENLARGED.
VOL. II.

Cæli enarrant Gloriam Dei.

LONDON:

PRINTED FOR LONGMAN, HURST, REES, AND ORME, FATERNOSTER-ROW-

1810.

R. WILKS, Printer,

19, Chancery-Lane, London.

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