CAPTAIN NOBLE AND MR, F. A. ABEL ON FIRED GUNPOWDER, 
229 
We have pointed out in our first memoir our reasons for considering fallacious a 
temperature of explosion deduced (as has been done by some authors) by dividing the 
number of gramme units of heat by the mean specific heat of the exploded powder at 
0° C. ; but for purposes of comparison, to exhibit the striking differences between the 
powders, as well as because we have not data at our disposal to enable us to deduce 
the actual temperature of explosion in the case of each of the six powders, we give 
below the temperature of each powder calculated upon the above hypothesis. 
They are as follow:— 
Temperature of explosion on above hypothesis of 
W. A. pebble powder. 3899 C. 
W. A.R.L.G. „ . . 3880 „ 
W. A. F. G. „ 3897 „ 
C. and H. No. 6 „ . . . *. 4083 „ 
Mining ,, 2896 ,, 
Spanish pellet ,, 4087 ,, 
The volumes of the permanent gases generated by the explosion of each of the six 
powders are as follow :— 
1 gramme of W. A. pebble powder generated 2 75 • 7 cubic centimetres 
1 „ 
„ W.A.R.L.G. „ 
yp 
27F3 
1 
„ W. A. F. G. 
y y 
259-2 
1 „ 
„ C. and H. No. 6 „ 
yy 
238-2 
1 
„ mining 
py 
354-6 
1 „ 
,, Spanish pellet ,, 
yy 
232-7 
The above volumes are all calculated for a temperature of 0° C. and a barometric 
pressure of 760 millims. of mercury. 
If we correct, as before, the quantities of permanent gases formed for the amounts 
of moisture contained in the powders when experimented with, we shall have the 
values given in Table VII. 
Table VII. — Giving the volumes of permanent gases generated by the explosion of 
1 gramme of the undermentioned perfectly dry powders. 
1 gramme W. A. pebble powder generates 278'3 cubic centimetres." 
W. A. E. L. G. 
yy 
yy 
274-2 
W. A. F. G. 
yy 
y y 
263-1 
C. and H. No. 6 
yy 
yy 
241-0 
mining 
yy 
yy 
360-3 
Spanish pellet 
yp 
py 
234-2 
* It is perhaps necessary to remind readers not familiar with the French metrical system that the 
assertion that a gramme of powder generates 278‘3 cubic centimetres of permanent gases at temperature 
