\Vhyte.^2. 



Fig. 5. 



Spec. : Machine Gun Mechanism. 

 Ilium. : Vertical. 

 Camera: 78 cms. Obj. : 4 mm. 

 Ocu. : Projn. Mag. : 500 diams. 

 Unetched. 

 Remarks; File mark in radius at 

 bottom of extractor stOp. 



Fig. 6. 



Spec. : Machine Gun Mechanism. 

 Ilium. : Vertical. 

 Camera. : 61 cms. Obj. : 2 mm. 

 Ocu.: Projn. Mag-.: i,oco diams, 

 Unetched. 

 Remarks: File mark in radius de- 

 flected alongside slag patch. 



^' 



■M, 



Fig. 



7. 



Spec. : Machine Gun Mechanism. 



Ilium. : \^ertical. 



Camera: Q2.5 cms. Obj.: 2 mm. 



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



Etched: Picric Acid, 

 Remarks: Strain in structure round 

 crack in .50% C. steel. Troostitic 

 condition. 



Fig. 8. 



Spec. : B. Brass. 



Ilium. : \'crtical. 



Camera: 55 cms. Obj.: 4 mm. 



Ocu. : Projn. Mag. : 250 diams. 



Etched: .Ammonium h>'drate. 

 Remarks: Shows junction of three 

 crj'stal grains. Each \vith own sys- 

 tem of slip bands. 



