On the Rapid Production of Steam. 



297 



The 2d, 3d, 4th and 5th experiments, present a remarkable coin- 

 cidence of results, and prove that at the temperature of comparison, 

 nine pounds of wrought iron will generate one pound of steam, under 

 atmospheric pressure. Subsequent series will show, that, but for 

 the caution necessary to avoid waste, this effect might have been 

 produced in twenty-five or thirty seconds, instead of the times above 

 noted. 



SECOND SERIES, 



With wrought iron cylinders, 6 inches long, and 1.7 inches in diame- 

 ter; surface, 38 square inches, including that of the hook; water 

 kept at 212°. 



The Striking correspondence in the results of those experiments in 

 the above series, which purport to have been made at the compara- 

 ble temperature (No.'s 5, 6, 7, 8 and 9) with the analogous ones in 

 the first series, render it evident that in this form, as well as in that 

 of the plate, the amount of steam generated by any portion of wrought 

 iron at a dull red heat, bears a direct relation to the weight of metal, 

 being one pound of steam to every nine pounds of iron. 



