Whyte.— 3. 



Fig. q. 



Spec. : Nickel Rolled Bar. 

 Ilium. : Vertical. 

 Camera: 02.5 cms. Obj. : 2 mm. 

 Ocu. : Projn. Mag-.: 1,500 diams. 

 Etched: Nitric Acid. 



Remarks: Etching- pits in nickel 

 crystals. 



Fig. 10. 



Spec. : Nickel Rolled Bar. 



Ilium. : \'ertical. 



Camera: 92.5 cms. Obj.: 2 mm. 



Ocu. : Projn. Mag-. : 1,500 diams. 



Etched: Nitric Acid. 

 Remarks: Twinning- plane in nickel 

 crystal with resulting difference in 

 orientation. 



