12-IìsCH STEEL B. L. RIFLED MORTARS.
54
Tube.
No. 7354.
־it t i 19609 B4
Marks, bt2m Diameter, ".564.
Sectional area, .25 square inch. Gauged length, 3".
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.
Inch. 0. .000100 .000267 .000667 .001000 .001167 .001333 .001667 .001867 .002333 .003000 .006333 .006833 . 007333	Inch. 0. .000100 .000167 . 000400 .000333 .000167 .000166 .000334 .000200 .000466 .000667 .003333 .000500 .000500	Inch. 0. 0.	Inch. 0. 0.
			
			
		0. 0.	0. 0.
			
			
			
			
			
			
			
			
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
35.000
40.000
50.000
55.000
56.000
57.000
58.000
59.000
60.000 100,480
General summary.
......................pounds..	100,480
........................do...	55,000
........................inch..	.1867
........................do...	.001867
........................do...	.124
.....;........................ 39.2
...................... 1".2 from neck
granular 50 per cent, silky 50 per cent ...................... ".12, ".20, ".24*
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.............................