96 
CAPTAIN NOBLE AND MR. E. A. ABEL ON EIRED GUNPOWDER. 
The results of the whole of our experiments, as far as they relate to tension, arranged 
according to the three descriptions of the powder used and to the density of the products 
of explosion, are given in Table V. The experiments numbered with an asterisk are 
taken from the earlier series made by Captain Noble. They accord very well with the 
present experiments ; but the powder used in the first series not having been analyzed, 
we are not prepared to say that it was of exactly the same constitution as the corre- 
sponding kind of powder used in the present experiments, although the difference could 
of course be but very trifling, it being gunpowder of Waltham- Abbey manufacture, which, 
as shown by the analyses given in Table II., varies very little in composition. 
Table V. — Giving the pressures actually observed, in tons per square inch, with F. G., 
R. L. G., and Pebble powders for various densities of the products of Explosion. 
Mean 
density of 
products 
of explosion. 
Nature of Powder. 
Mean 
density of 
products 
of explosion . 
Nature of Powder. 
F. G. 
E.L.G. 
Pebble. 
F.G. 
E. L. G. 
Pebble. 
Pressure in 
tons per 
square inch. 
Pressure in 
tons per 
square inch. 
Pressure in 
tons per 
square inch. 
Pressure in 
tons per 
square inch. 
Pressure in 
tons per 
square inch. 
Pressure in 
tons per 
square inch. 
. -0940 
1-6 
•5000 
10-48 
10-48 
•1064 
1-66 
1*39 
10-20 
10-70 
1-35 
1-26 
11-10 
,, 
0 96 
1-28 
*•5300 
*u-8o 
•1973 
2-67 
•5322 
11-48 
12-20 
•2000 
2-70 
•6000 
14-14 
14-36 
13-78 
•2114 
2-93 
„ 
13-50 
•2129 
3-70 
,, 
14-80 
„ 
3-58 
*•6100 
*15-6 
„ 
3-00 
*•6200 
*16-8 
•2963 
6-40 
•7000 
18-2 
19-54 
18-60 
•3000 
5-40 
„ 
+18*9 
J17-00 
•3171 
4-90 
*'75°° 
*21-90 
•3193 
6-75 
1 -8000 
23-20 
24-40 
28-60 
„ 
6-32 
27-10 
23-20 
24-20 
*•3800 
*8-5 
•9000 
27-20 
35 -6 
33-40 
*7.7 
31-60 
•3860 
7-68 
,, 
31-40 
•3947 
8-1 
1 *’9000 
*33*i 
•4258 
9-34 
8-40 
*3°-7 
„ 

9-10 
*3 1 1 "9 
•4615 
8-68 
! -9150 
34-5 
•4893 
10-14 
•9300 
36-2 

•4934 
11-50 
•9300 
*340 
§35 0 
f R. E. G. powder. t Spanish spherical pellet. § Pellet. 
We have laid down on Plate 16 the whole of these experiments. The pressures 
given by the pebble and the R. L. G. are nearly identical ; we have therefore considered 
them so, and have drawn but one curve to represent their mean results. The curve 
representing the pressures given by the F. G., although nearly identical with the pebble 
and R. L. G. at the lower densities, does not coincide at the higher densities. A separate 
curve has therefore been drawn for this powder. The lower tension is perhaps accounted 
