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
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”