On the Rapid Production of Steam. 



!13 



The' five experiments which were made at a dull red heat in day- 

 light, and which were therefore marked comparable, prove that, on 

 an average, one pound of steam requires lO/Zo pounds of cast brass 

 of that temperature for its production. It was observed that the vio- 

 lence of agitation, when brass was employed, appeared to be much 

 greater than when similar masses of iron were the subjects of experi- 

 ment. This was attributed to its higher conducting power. A repe- 

 tition of this series might not exhibit precisely the same results, un- 

 less the specimens employed should have the same proportion of in- 

 gredients and the same specific gravity. 



SEVENTH SERIES, 



With ingots of standard silver, of various weights, from 21 J to 195^ 

 ounces avoirdupois. 



From a comparison of the three experiments marked comparable, 

 in the above table, it appears that about 18jW pounds of standard 

 silver will be required for generating one pound of steam. 



