321
INTERNAL STRAINS IN GUN FORGINGS,
Muzzle Slice.
Interior diameter, 4".27; exterior diameter, 8".53. Original diameters of rings in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
	Inches. 4.3052 5.1373 7.1509 8.3462	Inches. 4.3091 5.1445 7.1469 8.3457	Inches. 4.30715 5.1409 7.1489 8.34595
			
			
			
			
Rings 1 and 4 detached; rings 2 and 3 in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
	Inches. 4.3110 5.1355 7.1495 8.3642	Inches. 4.3154 5.1441 7.1468 8.3290	Inches. 4.3132 5.1398 7.14815 8.3466
			
			
			
			
RINGS ALL DETACHED.
	5.1381	5.1454	5.14175
	7.1468	7.1441	7.14545
			
Muzzle strains released.
Rings.	Diameters.		
	A.	B.	Mean.
	Inch. + .0058 -.0018 -.0014 + .0180	Inch. +.0063 -.0004 -.0001 - .0167	Inch. +.00605 -.0011 -.00075 + .00065
			
			
			
			
SECOND TO THIRD PHASE.
	+.0026	+ .0013	+ .00195
3 detached			-.0027	-.0027	-.0027
FIRST TO THIRD PHASE.
	+ .0008	+.0009	+ .00085
	-.0041	-.0028	-.00345
			
H. Doc. 508----■21