"Whyte.— 1. 



^1^:- 



.C'Ai, 





Fig. I. 



Spec. : Small Forging. 



Ilium. : Vertical. 



Camera: 66 cms. Obj. : 20 mm. 



Ocu. : Projn. Mag. : qo diams. 



Etched: Picric Acid. 



Remarks: Slag driven into steel 



along ^vith some decarbonised 



layers from the surface. .42% C. 



steel. 



Fig. 2. 



Spec. : High-speed Steel. 

 Ilium. : Vertical. 

 Camera: 78 cms. Obj.: 4 mm. 

 Ocu. : Projn. Mag. : 500 diams. 

 Etched: Picric Acid. 



Remarks: Fine Grains of Austenite 



with traces of free tungstede steel 



unabsorbed. (White globules.) 



Fig. 3. 



Spec. : High-speed Steel. 

 Ilium. : Vertical. 

 Camera: 66 cms. Obj.: 2 mm. 

 Ocu. : Projn. Mag.: 1,000 diams. 

 Etched: Picric Acid. 



Remarks: Large grains of Austenite 

 surrounded by oxide. 



Fig. 4- 



Spec. : High-speed Steel. 



Ilium. : Vertical. 



Camera: 78 cms. Obj.: 4 mm. 



Ocu. : Projn. Mag. : 500 diams. 



Etched: Picric Acid. 

 Remarks: Fine grains of Austenite 

 with considerable amount of free 



tungstede. (White globules.) 



