305
INTERNAL STRAINS IN GUN FORGINGS,
Muzzle Slice.
Interior diameter, 4".20; exterior diameter, 8".60. Original diameters of rings in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
1		Inches. 4.3335 5.1433 7.1420 8.3406	Inches. 4.3311 5.1461 7.1430 8.3403	Inches. 4.3323 5.1447 7.1425 8.34045
2				
3				
4				
			
Rings 1 and 4 detached; rings 2 and 3 in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
1 detached		Inches. 4.3370 5.1423 7.1414 8.3444	Inches. 4.3357 5.1457 7.1430 8.3328	Inches. 4.33635 5.1440 7.1422 8.3386
2				
3				
			
			
RINGS ALL DETACHED.
2 detached			5.1489	5.14745
3 detached			7.1393	7.1389
Muzzle strains released.
Rings.	Diameters.		
	A.	B.	Mean.
1 detached		Inch. +.0035 -.0010 -.0006 +.0038	Inch. +.0046 -.0004 .0000 -.0075	Inch. + .00405 -.0007 -.0003 -.00185
2 in slice				
3 in slice				
4 detached				
			
SECOND TO THIRD PHASE.
2 detached		+.0037	+ .0032	+ .00345
3 detached		-.0029	-.0037	-.0033
FIRST TO THIRD PHASE.
2 detached		+.0027	+ .0028	+.00275
3 detached		-.0035	-.0037	-.0036
H. Doc. 508----20