TensUe strength per square inch of original section pounds.. 106,000

Elastic limit per square inch of original section do... 67,000

Elongation per inch after rupture inch.. .200

Elongation per inch under strain at elastic limit do... .00246

Beduction in diameter at point of rupture do... .006

Reduction in area after rupture, per cent of original section 84

Position of rapture 1^.15 from the neck

Character of broken surface silky

^of InchiecUooa «'.18,*.22»



54



6-inch r. f. guns.
Bbeeghblogk.
No. 8074.
Forging S 8515.
Marks, ^Sr«^^
Diameter, ".505.
Sectional area, .20 square inch.
Gauged lengtli, 2".
AppUed

loads per

square

Inch.
EloD^tion
per inch.
Successiye
elongation
per inch.
Permanent
set.
Successiye

permanent

set.
Remarks.
Pwinda,
1,000
5,000
80,000
50,000
55,000
60,000
65,000
70,000
72,000
73,000
74,000
75,000
109,500


Inch.
0.
.00010
.00105
.001B5
.00195
.00210
.00230
.00260
.00260
.01000
.01050
.01130


Inch,
0.
.00010
.00095
.00080
.00010
.00015
.00020
.00020
.00010
.00740
.00060
.00080


Inch.
0.
0.
Inch.
0.
0.
Initial load.
Elastic limit.
Tensile strength.
.00005


.00005











































General mmmary.
Tensile strength per square inch of original section pounds.. 109,600

Elastic limit per so uare inch of original section do . . . 72, 000

Elongation per inch after rupture inch.. .175

Elongation per inch under strain at elastic limit do. . . . 00260

Reduction in diameter at point of rupture do . . - .105

Reduction in area after rupture, per cent of original section 37. 1

Position of rupture at the middle of the stem

Character of broken surface silky

Elongation of inch sections ".14, ".21*



TABULATION OF TENSION SPECIMENS FROM 6-INCH R. R GUNS.
STEMS 2" LONG, ".605 DIAMETER,



No. of
test.
Position
in gun.
Location
of speci-
mens.
Elastic
limit
per

square
inch.
Tensile
strength

per
square
inch.
Elon-
tfon.
Con-
trac-
tion
of
area.
