[Ms. volume dealing exhaustively with navigational and related astronomical problems / William Bayley, 1781. Includes sections on construction of Gunter's Quadrant; Dials - construction of sundials, horizontal or wall dials at various planes; projection of spheres; use of compass; tacking to starboard and larboard; making charts; variations of the compass; description and uses of instruments used in navigation and astronomy; astronomical definitions and problems; information on constellations and planets. Neatly written on 147 pages, with over 50 illustrations (many coloured) and including six volvelles]