On the Production of Steam from heated Iron. 



73 



been attained, varies considerably from that which precedes, and 

 that possibly different stages of rapidity will be discovered, in differ- 

 ent parts of the series following the time of most rapid vaporization. 



First course, comprising twelve series. 



Exhibiting the times in which given quantities of water of known 

 temperature, may be successively converted into vapor, while the iron 

 which produces it is cooled from redness to the point of ebullition. 



1st series. 5f oz. generated in 281" 

 2 intervals, 60" each 120 



whole lime of the series, 401 

 Vol. XXI.— No. 1. 



2d series. 4 oz. generated in 457" 

 7 intervcds 10" each 70 



whole time of the series 

 10 



527 



