311
INTERNAL STRAINS IN GUN FORGINGS.
Breech Slice.
Interior diameter, 4".77; exterior diameter, 10".46. Original diameters of rings in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
1		Inches. 4.9305	Inches. 4.9270	Inches. 4.92875
2		5.6435	5.6485	5.6460
3		9.6475	9.6451	9.6463
4		10.2919	10.2879	10.2899
			
Rings 1 and 4 detached; rings 2 and 3 in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
	Inches. 4.9384 5.6426 9.6470 10.2822	Inches. 4.9335 5.6467 9.6438 10.2947	Inches. 4.93595 5.64465 9.6454 10.28845
2				
3				
			
			
RINGS ALL DETACHED.
2 detached			5.6468	5.6512	5.6490
3 detached		9.6419	9.6399	9.6409
Breech strains released.
Rings.	Diameters.		
	A.	B.	Mean.
	Inch. +.0079 -.0009 -.0005 -.0097	Inch. + .0065 -.0018 -.0013 + .0068	Inch. + .0072 -.00135 -.0009 -.00145
			
			
			
			
SECOND TO THIRD PHASE.
	+ .0042	+.0045	+.00435
	-.0051	-.0039	' -.0045
			
FIRST TO THIRD PHASE.
2 detached			+ .0033	+ .0027	+ .0030
3 detached			 		-.0056	-.0052	-.0054