An account of the principle and effects of the air stove-grates, (which warm rooms, &c. by a continual introduction and exchange of dry fresh air,) commonly known by the name of American stoves Together with a description of the late additions and improvements made to them By James Sharp, (for which His Majesty's patents for Great-Britain are obtained,) no. 15, Leadenhall-Street, London. Either warm or cold air may (by this improvement) be drawn through the stove so as to raise or lower the thermometer at pleasure: and, it is found by experience, if a room be made ever so warm it will still be fresh air, perfectly free from smell, and agreeable to the nicest breath and tenderest lungs