119
PIVOT YOKES---15-POUNDER GUN MOUNTS.
No. 7261.
Marks, fpYi5 Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.	Remarks.
Pounds. 1,000 5,000 10,000 20,000 26,000 27.000 28.000 29.000 30.000 31.000 68,900	Inch. 0. .00010 . 00035 . 00080 .00130 .00195 .00265 . 00395 .00425 . 00530	Inch. 0. . 00010 . 00025 . 00045 .00050 . 00065 .00070 .00130 .00030 .00105	Inch. 0. 0.	Inch. 0. 0.	Initial load Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
General summary.
Tensile strength per square inch of original section.............................pounds.. 68,900
Elastic limit per square inch of original section..................................do... 26,000
Elongation per inch after rupture................................................inch.. . 2350
Elongation per inch under strain at elastic limit................................do... . 00130
Reduction in diameter at point of rupture..........................................do...	. 085
Reduction in area after rupture, per cent of original section.......................... 30.7
Position of rupture.............................................................. ". 6 from neck
Character of broken surface........................................................ dull silky
Elongation of inch sections........................................................ ". 28*,". 19
No. 7271.
Marks, I p1 y is Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.	Remarks.
Pounds. 1,000 5,000 10,000 20,000 30.000 34.000 35.000 36.000 37.000 38.000 39.000 74,400	Inch. 0. .00010 . 00035 .00065 . 00100 . 00125 .00900 .00950 . 01000 .01100 .01215	Inch. 0. .00010 .00025 .00030 .00035 .00025 .00775 .00050 . 00050 .00100 .00115	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
General summary.
......................pounds..	74,40o
.........................do...	34,000
........................inch..	.1750
.........................do...	.00125
.........................do...	.055
............................. 20.5
..................... ".85 from neck
granular, silky spot at circumference ..........................".16, ".19*
Tensile strength per square inch of original section...
Elastic limit per square inch of original section......
Elongation per inch after rupture...................... .
Elongation per inch under strain at elastic limit......
Reduction in diameter at point of rupture..............
Reduction in area after rupture, per cent of original section.
Position of rupture....................................
Character of broken surface............................
Elongation of inch sections................................