55
12-INCH STEEL B. L. EIELED MOBTARS.
Tube.
No. 7370.
-««•	,	19524 B3
Marks, BT.M Diameter, ".564.
Sectional area, .25 square inch. Gauged length, 3".
Remarks.
Successive
permanent
set.
Permanent
set.
Successive elongation per inch.
Elongation per inch.
Inch.
Inch.
Inch.
I
Inch.
Initial load.
Elastic limit.
Tensile strength.
0.	0.	0.
. 000100	0.	0.
.000200 ..................
.000300	................
.000367	................
. 000133	0.	0.
. 000200	0.	0.
.000400	................
. 000033	................
.003534	.............
. 000400	..............
. 001000 .................
.000666 ..................
. 001100 ................ -
0.
.000100 .000300 .000600 .000967 .001100 .001300 .001700 .001733 .005267 . 005667 .006667 .007333 .008433
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
35.000
40.000
50.000
51.000
52.000
53.000
54.000
55.000
56.000 92,320
General summary.
Tensile strength per square inch of original section........................pounds.. 92,320
Elastic limit per square inch of original section...............................-do... 51,000
Elongation per inch after rupture...............................................inch.. .1833
Elongation per inch under strain at elastic limit...............................do... . U01733
Reduction in diameter at point of rupture.......................................do...	. 074
Reduction in area after rupture, per cent of original section...................24
Position of rupture.........................................— -• ---........;9•. ־־־ fr0*?■ neck
Character of broken surface...........................granular, dull silky spot at circumference
Elongation of inch sections.....................................................15> •18> •22*