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Theory and Practice of Finding Longitude at Sea or Land

to which is added, various methods of determining the latitude of a place, and variation of the compass; with new tables

the third edition, improved and enlarged

by Andrew MacKay.

London, printed for Longman, Hurst, Rees, and Orme, 1810.

2 volumes. ppxvi 365, viii 294 + errata leaf at end of volume one, and author’s self promotion leaf at end of volume two

complete with the eight folding plates.

some light foxing to the plates, otherwise internally clean and fresh, but the printed title-page is lacking from volume one, with a few preliminary leaves loose or working loose. bound in the original cloth-backed boards, with paper title-labels to spine and large printed title-label to front board. bindings sound with some wear and a little loss of paper covering to the boards.

the final edition of Andrew MacKay’s important work on the finding of longitude, first published in 1793.

volume one is signed by Mackay at the end of the preface, which at first sight seems odd as he died in 1809. However, the work was obviously ready for publication in January 1809, when the preface is dated, and the National Maritime Museum holds a document from MacKay dated July 1808 in which he seeks the approval of Trinity House for the forthcoming third edition, which is “nearly printed, and will be soon ready for publication”.

 

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