A philosophical investigation of the origin, [electronic resource] : Vicissitude, and Power of steam employed in a fire-engine with A candid and familiar Explanation of the Parts, Powers, and true Construction of that ingenious Machine: and Demonstration that the Force of the Steam is the direct and efficient Cause of the Ascent of the Piston in the Cylinder: And also the Occasion of all Evacuation therein by snifting, &c. contrary to the mistaken Opinion of many Engineers, &c. From whence the true Rationale and Construction of that noble Machine may be easily deduced, many Errors corrected, and Improvements made. By Cuthbert Clarke.