Airopaidia : containing the narrative of a balloon excursion from Chester, the eighth of September, 1785, taken from minutes made during the voyage : hints on the improvement of balloons, and mode of inflation by steam : means to prevent their descent over water : occasional enquiries into the state of the atmosphere, favouring their direction : with various philosophical observations and conjectures. To which is subjoined, mensuration of heights by the barometer, made plain : with extensive tables. The whole serving as an introduction to aërial navigation : with a copious index / by Thomas Baldwin, Esq. A. M.