23 6 
CAPTAIN NOBLE AND MR. F. A. ABEL ON FIRED GUNPOWDER. 
And on account of its very great utility we give in Table XI. the results of the calcula¬ 
tions of W for various values of v up to and inclusive of t>=50, the powder used being- 
supposed to be of the normal type and free from moisture, and the constants having 
the values given in Table IX. 
The work is expressed in the table both in metre tonnes per kilogramme and foot- 
tons per pound of powder burned, and by use of a proper factor of effect is applicable 
also to powders differing very materially from those of Waltham Abbey manufacture— 
for example, to mining or the Spanish powders. 
But before entering upon these special cases we shall, as the principles embodied in 
this table have led to the greatly increased charges of recent guns and the consequent 
high velocities attained, give one or two illustrations of its application. 
Table XI.—Giving for value of v up to r=50, the total work that dry gunpowder of 
the Waltham Abbey standard is capable of performing in the bore of a gun in 
metre tonnes per kilogramme, and foot-tons per lb. of powder burned. 
Number of 
volumes 
of expansion. 
Corresponding 
density of 
products of 
combustion. 
Total work that gunpowder is capable of performing. 
Per kilogramme 
burned in 
metre tonnes. 
Difference. 
Per lb. 
burned in 
foot-tons. 
Difference. 
1-00 
1-000 
1-01 
•990 
0-669 
•669 
•980 
•980 
1-02 
•980 
1-322 
•653 
1-936 
•956 
1-03 
•971 
1-960 
•638 
2-870 
•934 
1-04 
•962 
2-583 
■623 
3-782 
•912 
1-05 
•952 
3-192 
•609 
4-674 
•892 
1-06 
•943 
3-788 
•596 
5-547 
•873 
1-07 
•935 
4 - 370 
•582 
6-399 
•852 
1-08 
•926 
4-940 
•570 
7-234 
•835 
1-09 
•917 
5-498 
•558 
8-051 
•817 
1T0 
•909 
6'045 
•547 
8-852 
•810 
111 
•901 
6-581 
•536 
9-637 
•785 
1-12 
•893 
7-106 
•525 
10-406 
•769 
113 
•885 
7-621 
■515 
11T60 
•754 
1-14 
•877 
8-126 
•505 
11-899 
•739 
1-15 
•870 
8-622 
"496 
12-625 
•726 
1-16 
■862 
9-109 
•487 
13-338 
■713 
1-17 
•855 
9-587 
•478 
14-038 
•700 
1-18 
•847 
10"056 
•469 
14-725 
•687 
1-19 
•840 
10-517 
•461 
15-400 
•675 
1-20 
•833 
10-970 
•453 
16-063 
•663 
1-21 
•826 
11-416 
•446 
16-716 
•653 
U22 
•820 
11-855 
•439 
17-359 
•643 
1-23 
•813 
12-287 
•432 
17-992 
•633 
1-24 
•806 
12-712 
•425 
18-614 
•622 
1-25 
•800 
13-130 
•418 
19-226 
•612 
1-26 
•794 
13-541 
•411 
19-828 
•602 
1-27 
•787 
13-945 
*404 
20-420 
•592 
1-28 
•781 
14-342 
•397 
21-001 
■581 
1-29 
•775 
14-732 
•390 
21-572 
•571 
1-30 
•769 
15-115 
•383 
22-133 
•561 
