Astronomical & geographical essays: [electronic resource] : containing, I. A full and comprehensive view, on a new plan, of the general principles of astronomy. II. The use of the celestial and terrestrial globes, exemplified in a greater variety of problems, than are to be found in any other work. III. The description and use of the most improved planetarium, tellurian, and lunarium. IV. An introduction to practical astronomy. / By the late George Adams, mathematical instrument maker to His Majesty, and optician to the Prince of Wales