96 
BIRNIE. 
Table A—Continued. 
BEFORE ANNEALING. 
Muzzle section, third stage. Original diameters, j _g'gjj Indies* 
Diameters. 
State of rest—stresses. 
State of action. 
Measured. 
Deduced. 
Pressure. 
Stresses. 
Inches. . 
Bore, 3.2 
3.35 
* 
3.90 
4.46 
Exterior, 4.60 
Pounds 
per sq. inch. 
— 26,000 
— 1,925 
+ 28,600 
Pounds 
per sq. inch. 
— 36,748 
—(26,000) 
+ 3,378 
-f 22,836 
+ 26,808 
Pounds 
per sq. inch 
■ 
0) 
pH 
Pounds 
persq. inch. 
+ 14,784 
+ 21,900 
+ 36,049 
+ 60,000 
Thickness of section in 
calibers, 0.22. 
Elastic limit. 
* Neutral point, d — 3.82. 
AFTER ANNEALING. 
Breech section, third stage. Original diameters, ^ches 
Bore, 3.6 
— 29,170 
— 30,905 
+ 60,000 
Elastic limit. 
3.81 
— 25,20 ' 
—(25,200) 
© 
+ 55,119 
4.41 
— 31,290 
— 13,164 
o 
+ 30,330 
Thickness of section in 
5.05 
— 18,120 
— 4,752 
§ 
+ 30,443 
calibers, 0.75. 
5.70 
— 790 
+ 1,058 
»0.j® 
o“ 
+ 38,749 
6.30 
+ 9.048 
+ 4,906 
of u 
+ 42,613 
6.95 
+ 16,620 
+ 8,002 
10 o 
+ 45,378 
7.57 
+ 19,220 
+ 10,243 
-g 
+ 44,497 
8.20 
+ 20,600 
+ 12,020 
C8 
+ 43,119 
8.82 
+ 21,500 
+ 13,410 
'3 
+ 41,860 
Exterior, 9.00 
+ 18,500 
+ 13,761 
+ 38,315 
* Neutral point, d = 5 562. 
Muzzle section, third stage. Original diameters, | ^° ?'gg Aches' 
Bore, 3.2 
— 20,254 
+ 59,710 
3.35 
— 14,330 
—(14,330) 
<x> 
O'.H ° 
+ 60,00u 
Elastic limit. 
* 
.. ,IB,II,,III; 
cg -g g 
3.90 
— 3,460 
+ 1,861 
— "to 
+ 55,467 
Thickness of section in 
• 4.46 
+ 10,100 
+ 12,586 
(SI qi ..I 
._. w 
+ 58,825 
calibers, 0.22. 
Exterior, 4.60 
+ 14,676 
0> 
* Neutral point, d — 3.82. 
The Possible Maximum Resistance of the Sections .—Suppose 
the initial tension curve to be such as is required by theory 
to give a maximum resistance, several propositions may be 
stated : 
1st. The point of critical strain may always be taken at 
the surface of the bore where the compression at rest or the 
