THE ROYAL ARTILLERY INSTITUTION. 
will probably penetrate, should the ground be soft, or, as in Pig. 24, suffer 
deflection should it be rough or stony. . 
We will take another case, in which shells burst by percussion will do 
very little if any damage to the target. _ Suppose an. abrupt short descent 
embankment, side of a cultivated hill, &c., as in Pig. 25, a target 
placed on the crest would hardly be injured by shells burst by percussion. 
And, generally, in any broken ground whatever, or uncleared land,, such as 
is indicated faintly in Pig. 26 ; attempts to produce good effects, by 
bursting shells on impact, will probably end in disappointment. 
In the case of gently undulating ground, such as is shewn in Iig. 27, and 
presenting nothing when seen from the front, but a series of ridges very 
undefined, the enemy posted on the reverse sides, time fuzes must be used, 
to burst the shells at the crest. 
[yol. VI.] 
6 
