225
INTERNAL STRAINS IN GUN FORGINGS.
Muzzle Slice.
Interior diameter, 4".27; exterior diameter, 8".92. Original diameters of rings in the slice.
Rings.		Diameters.	
	A.	B.	Mean.
1		Inches. 4.4146	Inches. 4.4226 5.1462 7.1361	Inches. 4.4186 5.1469 7.1359
2			5.1476 7.1357		
3				
4		8.7661	8.7741	8.7701
Rings 1 and 4 detached; rings 2 and 3 in the slice.
Rings.	Diameters.		
	A.	B.	Mean.
	Inches. 4.4185 5.1473 7.1356 8.7595	Inches. 4.4269 5.1455 7.1355 8. 78fifl	Inches. 4.4227 5.1464 7.13555
2				
3				
			
			
RINGS ALL DETACHED.
2 detached					 5.1496	5.1487	5.14915
3 detached	•			-	1 7.1329	7.1333	7.1331
Muzzle strains released.
Rings.	Diameters.		
	A.	B.	Mean.
	Inch. + .0039 -.0003 -.0001 -.0066	Inch. +.0043 -. 0007 -.0006 + .0118	Inch. +.0041 -.0005 -.00035 +.0026
			
			
			
			
SECOND TO THIRD PHASE.
2 detached		+ .0023	+.0032	+ .00275
3 detached		-.0027	-.0022	-.00245
FIRST TO THIRD PHASE.
2 detached		+.0020	+.0025	+.00225
3 detached		-.0028	-.0028	-.0028
H. Doc. 508—.—15