The Elements of Navigation Containing the theory and practice With the necessary Tables To which is added A treatise pf marine fortification Composed for the Use of The Royal mathematical School at Christ's hospital The Royal Academy of Portsmouth And the Gentlemen of the Navy The Third Edition with Additions And Compendiums for finding The latitude and longitude at Sea By J. ROBERTSON LIBRARIAN to the Royal Society Late Master of the Royal Mathematical School Christ's Hospital, London and afterwards for more than Eleven Years Head-Master of the Royal Academy, at Portsmouth LONDON Printed for J. NOURSE Bookseller to His MAJESTY MDCCLXXII (1772) Volume I. ONLY Bound in full leather with gilt detail to spine. Measuring approx.23.7cm x 15.2cm x 3.7cm. Leather is scuffed/rubbed with some marks and there is a small dent/chip to front board. There is a small portion of paper to centre of front and rear boards. The top third of leaves have staining, getting smaller upt o centre of the volume. Ink annotation with ink staining/scoring to top of title page (which has bled through to following three leaves). Pencil number to half title page and pencil mark to verso of title page. A section of six or so leaves are detaching and have wrinkle/chip to inner edge. Lightly thumbed with some corner bumps and creases. A couple of the folding plates are a little misfolded/creased/worn and are frayed to edges. Some marks and occasional creases. Lacking one text leaf and two plates. Contents are cracking/straining in places, although the majority of contents are in reasonably clean condition. xii, [8] xxxii, I-192 [lacking] 195-398 Four folding plates. A rigorous blend of theory and practice, covering essential mathematical principles such as arithmetic, geometry, trigonometry, astronomy, Latitude and Longitude. Tables designed to help sailors determine their precise position at sea and for manual nautical calculations.