INTEBNAL STBAINS IN GUN FOBGINGS.	289
Muzzle Slice.
Interior diameter, 4".28; exterior diameter, 8”.58. Original diameters of rings in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
1		Inches. 4.4398 5.1*33 7.1505 8.2387	Inches. ■ 4.4*09 5.1*71 7.1*74 8.2479	Inches. 4.4*035 5*. 1*52 7.1*895 8.2433
2				
3				
4					
			
Rings 1 and 4 detached; rings 2 and 3 in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
	Inches. 4.4432 5.1426 7.1501 8.2418	Inches. 4.4443 5.1468 7.1472 8.2410	Inches. 4.44375 5.1447 7.14865 8.2414
2				
3				
			
			
RINGS ALL DETACHED.
	5.1441	5.1493	5.1467
	7.1485	7.1450	7.14675
			
Muzzle strains released.
. Rings.	Diameters.		
	A.	B.	Mean.
	Inch. + .0034 -.0007 -.0004 +.0031	Inch. + .0034 -.0003 ~. 0002 -. 0069	Inch. +.0034 -.0005 -.0003 -.0019
			
			
			
			
SECOND TO THIRD PHASE.
2 detached		+ .0015	+.0025	+ .0020
3 detached		-.0016	-.0022	-.0019
FIRST TO THIRD PHASE.
2 detached		+ .0008	+ .0022	+ .0015
3 detached		-.0020	-.0024	-.0022
19
H. Doc. 508