A new theoretical and practical treatise on navigation: : in which the auxiliary branches of mathematics and astronomy, comprised of algebra, geometry, logarithms, plane and spherical trigonometry, the motions of the heavenly bodies, tides, variation of the compass, etc., are treated of. : Also, the theory and most simple methods of finding time, latitude, and longitude, by chronometers, lunar observations, single and double altitudes, are taught. : together with a new and easy plan for finding diff. lat., dep., course, and distance. /