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THEORY AND PRACTICE

OF FINDING THE

L 0 N G

N G I T U D E

AT SEA ORLAND:

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 OP NEWCASTLE-

UPON-TYNE, AND MATHEMATICAL EXAMINER TO THE HONOURABLE

THE CORPORATION OF TRINITY-HOUSE, THE HONOURABLE

TRE 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, 89, Chancery-Lade, London.

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