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In this paper, which is a continuation of a former paper bearing the same title, the author states that the law given in that paper, in reference to steam when superincumbent on the water in the boiler, may be rendered applicable to the determination of its pressure when insulated therefrom, as in the case of the expansive engine, of which the cylinder being in part filled with steam of the same temperature as that in the boiler, the communication is suddenly cut off, and the stroke is completed by the pressure on the piston of the steam whilst expanding within the cylinder. He considers that the power of expansive engines has been greatly overrated, instancing those of the Great Britain, which were of the estimated power of 1200 horses, but which he states he can prove did not exceed in actual power that of 300 horses. This he attributes to the inapplicability of Mariotte’s law without a particular limitation. Having premised that “it is assumed that, by nature’s law in the generation of steam, of the temperature 100° and of a pressure of 15 lbs. on a square inch, the density of the Matter of Heat, is to that of atmospheric air of the same temperature and pressure exactly as 1 to 2,” he then gives general laws, by means of which, he considers, the pressure of steam when cut oft from its generating source may be correctly estimated.

On the temperature of steam, and its corresponding pressure