Robertson, J. and William Wales — The Elements of Navigation; Containing the Theory and Practice. With the Necessary Tables, and Compendiums for Finding the Latitude and Longitude at Sea. To Which Is Added, a Treatise of Marine Fortification

London, C. Nourse, 1786. 5th. Hardcover. Brown full leather binding with 5 raised bands. Diagrams and charts throughout. Some diagrams and maps foldout. xxxii, approx. 870 pp. Composed for the use of the Royal Mathematical School at Christ's Hospital, the Royal Academy at Portsmouth, and the gentlemen of the Navy. Fifth edition. Two volumes in one book. Important textbook on navigation for the 18th century British navy. Edited by William Wales, member of Captain Cook's second voyage. Fair, case very worn, pages at extremities worn, markings at extremities, pieces missing from first title page, still readable .