JOURN. R. MICR. SOC. 1907. PI. IV. 



Fig. 



Fig. 1. 



Fig. 3. 



Fig. 1.— Steel A, annealed at G20" C. After 100,000 reversals of 19 tons per 



sq in. X 415. 

 „ 3.— Steel A, annealed at 900'^ C. After 75,000 reversals of 19 tons per 



sq. in. X 415. 

 ,, 5. — Steel A, specimen 6. Heated after partial fatiguing. xl7-5. 



