CAPTAIN NOBLE AND MR. F. A. ABEL ON EIRED GUNPOWDER. 
133 
Table XX. — Giving the total work that gunpowder is capable of performing in the 
bore of a gun, in kilogrammetres per kilogramme and foot-tons per lb. of powder 
burned, in terms of the density of the products of explosion. 
Total work that the gunpowder 
is capable of realizing. 
Density of 
products of 
combustion. 
Number of 
volumes of 
expansion. 
Per kilogramme 
burned in kilo- 
grammetres. 
Per lb. burned 
in foot-tons. 
•95 
1-0526 
3210-8 
4-70 
•90 
1-1111 
6339-6 
9-29 
•85 
11768 
9412-8 
13-79 
•80 
1-2500 
12443-3 
18-23 
•75 
1-3333 
15460-8 
22-65 
•70 
1-4286 
18488-1 
27-08 
*65 
1-5385 
21544-9 
3156 
•60 
1-6667 
24650-8 
3611 
•55 
1-8182 
27841-9 
40-78 
•50 
2-0000 
31153-7 
45-62 
•45 
2-2222 
34614-0 
50-70 
•40 
2-5000 
38290-0 
56-08 
•35 
2-8571 
42234-7 
61-86 
•30 
3 3333 
46565-9 
68-21 
•25 
4 0000 
51414-8 
75-31 
•20 
5-0000 
57031-7 
83-53 
•17 
5-8824 
60952-1 
89-35 
•16 
6-2500 
62368-1 
91-45 
•15 
6*6667 
63884-4 
93-64 
•14 
7-1429 
65470-1 
95-94 
•13 
7-6923 
67138-4 
98-39 
•12 
8-3333 
68940-1 
101-00 
•11 
9*0909 
70855-4 
103-82 
•10 
10-0000 
72903-7 
106-87 
•9 
11-1111 
75214-5 
11018 
•8 
12-5000 
77679 9 
113-81 
•7 
14-2857 
80462 1 
117-85 
•6 
16-6667 
83582-1 
122-42 
•5 
20-0000 
87244-4 
127-79 
The results embodied in this Table are of very considerable importance. They 
enable us to say by simple inspection what is the maximum work that can be obtained 
from powder such as is employed by the British Government in any given length of gun. 
To make use of the Table, we have only to find the volume occupied by the charge (gravi- 
metric density = 1) and the number of times this volume is contained in the bore of the 
gun. The maximum work* per kilogramme or pound which the powder is capable of 
* It is hardly necessary to point out that the velocity of the projectile at any point of the bore is directly, 
deducible from equation (134). For the velocity being connected with the work by the equation 
velocity =. . W, 
V w 
w being the weight of the shot, we have only to take out from equation (34) or Table XX. the value of W for 
any given expansion, multiply it by the ‘‘factor of effect ” (see p. 134) for the particular gun, charge, &c., and 
use in the above equation the value of W so found.- 7 
As an illustration, if it be required to determine the velocity at the muzzle of the 10-inch gun under the 
