STRESSES IN GUN FORGINGS, 
95 
The radius of the neutral circle of stress for each section 
has been computed by (7) and is noted in the table. 
Table A. 
Measured and Deduced Stresses for the State of Rest and Action. 
BEFORE ANNEALING. 
Breech section, second stage. Original diameters, 1II 9'77 inches 
Diameters. 
State of rest—stresses. 
State of action. 
Measured. 
Deduced. 
Pressure. 
Stresses. 
Inches. 
Bore, 3.6 
Pounds 
per sq. inch 
Pounds 
per sq. inch 
— 86,477 
—(71,260) 
— 39,116 
— 16,658 
— 1,142 
Pounds 
per sq. inch. 
Pounds 
per sq. inch. 
+ 34 
Thickness of section in 
3.81 
4.41 
5.05 
5.70 
— 71,260 
— 56,800 
— 30,000 
— 2,370 
ffi 
O 
a 
c3 
+ 6,573 
+ 2.702 
+ 1,694 
+ 35,477 
calibers, 0.85. 
6.30 
6.95 
7 57 
8.20 
8.82 
9.54 
Exterior, 9.72 
+ 14,290 
+ 23,960 
+ 32,900 
+ 35,400 
+ 36,700 
+ 42,900 
+ 9,132 
+ 17,396 
+ 23,382 
+ 28,125 
+ 31,837 
+ 35,272 
+ 36,014 
i‘| 
*° O 
Cfl 
% 
+ 46.278 
+ 51,235 
+ 56,762 
+ 56,557 
+ 55,740 
+ 60,000 
Elastic limit. 
* Neutral point, d — 
5.76. 
Breech middle section, 
second stage. Original diam¬ 
eters, 
f J9 0 = 2.80 inches. 
\D 1 = 8.68 inches. 
Bore, 3.20 
3.38 
4.02 
4.64 
— 78,280 
— 75,000 
— 42,910 
— 10,670 
— 90,721 
—(75,000) 
— 35,169 
— 11,209 
© 
o 
p 
a 
+ 21,115 
+ 14,789 
+ 22,595 
+ 40,146 
Thickness of section in 
calibers, 0.81. 
5 26 
5.90 
6.50 
7.08 
+ 7,410 
+ 18,560 
+ 28,380 
+ 34,320 
+ 4,791 
+ 16,304 
+ 24,159 
+ 29,934 
©2 
+ 48,450 
+ 52,566 
+ 57,587 
+ 60,000 
Elastic limit. 
7.65 
8.24 
Exterior, 8.38 
+ 35,490 
+ 30,760 
+ 31,330 
+ 34,378 
+ 38,041 
+ 38,799 
GS 
13 
+ 58,454 
+ 51,485 
+ 51,593 
* Neutral point, d = 
5.04. 
Muzzle middle section, 
, second stage. Original diam¬ 
eters, 
f D q — 2.80 inches. 
\ D l = 6.44 inches. 
Bore, 3.20 
3.38 
4.02 
* 
4.64 
5.26 
5.90 
Exterior, 6.06 
— 65,300 
— 59,910 
— 13,430 
+ 19,070 
+ 30,500 
+ 22,630 
+ 24,510 
— 77,348 
—(59,910) 
— 15,737 
+ 10,838 
+ 28,583 
+ 41,352 
+ 43,930 
CG 
*35 
CO <D —A. 
r-1 <T) 
2*'s§ 
00^=4 
£ 
+ 670 
+ 56 
+ 31,328 
+ 54,679 
-1- 60,000 
+ 47,734 
+ 48,726 
Thickness of section in 
calibers, 0.45. 
Elastic limit. 
* Neutral point, d = 4.354. 
14-Bull. Phil. Soe., Wash., Vol. 13. 
