626 puesident's address — section h. 



lestored steel being far and away stronger than the original when 

 subjected to fatigue tests, and it was quite unnecessary to forge such 

 steel in order to restore it to good qualities. Discontinuity in the 

 material seems, however, to be a bar to success. So it has been 

 found* that it is impossible to restore fatigtied samples of steel by 

 meie annealing if the fatigue has been carried beyond a certain stage 

 so that an actual crack has been started. 



In thus trying to put before you some of the results of modem 

 inquiries into the structure of metals, I hope you Avill not think I 

 have attempted to turn Section H. into Section A. The matters 

 under review lie perhaps on the border land, but they have a very 

 important bearing upon engineering progress, and much of the in- 

 vestigation has been carried out by engineers. It may be classed as 

 engineering science rather than engineering practice, but even if 

 such knowledge does no more than give us a better understanding of 

 the nature of practical operations it is a great advantage to have it, 

 and there is always the possibility that the pure science of to-day 

 Ui.ay be the basis of the improved practice of to-morrow. 



F. Eogers, Journal Iron :uid Steel Inst., I., 190'). 



