126 



The Passive State of Iron and Steel. 

 Table II continued. 



[June 5, 



In addition to the observations recorded in Table II, numerous 

 other confirmatory experiments were made which it is not needful to 

 give in detail. 



* At these temperatures the first violent explosive ebullition of red nitric oxide 

 gas occurred consequent on the loss of passivity of the metal. The average critical 

 temperature point of transition from the passive to the active state was about 195 F. 



The observations show that the magnetised steel bars were less passive in warm 

 nitric acid than the unmagnetised steel bars. 



