271
INTERNAL STRAINS IN GUN FORGINGS,
Muzzle Slice.
Interior diameter, 4".24; exterior diameter, 857.״. Original diameters of rings in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
	Inches. 4.3915 5.1514 7.1540 8.4069	Inches. 4.3905 5.1483 7.1536 8.4000	Inches. 4.3910 5.14985 7.1538 8.40345
			
			
			
			
Rings 1 and 4 detached; rings 2 and 3 in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
	Inches. 4.3952 5.1519 7.1548 8.3988	Inches. 4.3941 5.1475 7.1529 8.3994	Inches. 4.39465 5.1497 7.15385 8.3991
			
			
			
			
RINGS ALL DETACHED.
	5.1542	5.1508	5.1525 i
3 detached —			7.1516	7.1504	7.1510
Muzzle strains released.
Rings.	Diameters.		
	A.	B.	Mean.
	Inch. + .0037 + .0005 + .0008 -.0081	Inch. +.0036 -.0008 -.0007 -.0006	Inch. +.00365 -.00015 + .00005 -.00435
			
			
			
			
SECOND TO THIRD PHASE.
+ .0023	+ .0033	+ .0028
-.0032	-.0025	-.00285
2	detached.
3	detached.
FIRST TO THIRD PHASE.
+ .0028	+ .0025	+ .00265
-.0024	-.0032	-.0028
2	detached.
3	detached.