THE EOYAL ARTILLERY INSTITUTION. 
245 
Front view of the toall after the third and last day's fire. 
The power of artillery to destroy Carnot's wall has been therefore clearly 
established, the guns having received no aid as to charge, direction, or eleva¬ 
tion, beyond what real service would afford, and the shells having in some 
measure been less efficacious than they really would have been, from the 
circumstance of so much powder having been taken out of them after two 
hours of the first day's fire (on account of the splinters reaching the batteries), 
that a very considerable number of the shells did not explode. 
5. From careful observation it appeared that about Jth of the shells and 
-Jth of the shot struck the wall,* many of both, which but just missed it, 
would have been efficacious, had the wail been longer. 
The increased rapidity of the fire is also observable, that of the third day 
being nearly double that of the first day, although the reduction in the 
height of the wall from 21ft. to 5 ft. rendered the operation obviously more 
difficult. 
A general view of the counterguard is also added in fig. 8, to show the 
appearance of the effect of the shells on its superior slope.t 
(Signed) 
E. DOUGLAS, 
Director-General, F. T. 
* Sir Howard Douglas gives the following more precise statement, which has been adopted in 
the text. 
Took effect on wall. 
Counterguard. 
Bastion. 
Shot. 
Shells. 
Shot. 
Shells. 
Shot. 
Shells. 
1st day . 
180 
168 
192 
190 
not obs 
ervable. 
2nd day. 
36 
68 
128 
111 
92 
65 
3rd day. 
73 
86 
204 
176 
235 
216 
289 
302 
624 
477 
327 
281 
Weight of iron fired, 112 tons, 11 cwt., 64 lbs. Sir Howard Douglas makes it rather more, 
having taken the carronade shot as weighing 68 lbs. instead of 665 lbs.—J. H. L. 
f It has not been thought necessary to reproduce this view. 
