JOURN. R. MICR. SOC. 1907. PI. V. 







» '.» 









^:^^^' 



•4 





Fig. 2. 



Steel A, annealed at 620"' C. After 252,300 reversals of 19 tons per 



sq. in X 15(X1 



« » •» 'J. 



f-f 



^. 



'v.-* 





V 



«. 







.■^ ** 



Sit ■!«?■ y.« _ 



Fig. 4. 



Steel A, annealed at 900- C, After 114,-300 reversals of 19 tons per 



sq. in. X 1500. 



