9. — The parks of the artillery should be estab-
lished on that side of the place where the attack is
to be carried on, their situations being concealed,
if possible, from the view of the garrison. When



inundations, woods, steep places, &c. The scale used for it
generally is 3-fourths inch, or 1 inch, to 200 yards.
* Several French Authors recommend the use of balloons in
reconnoitring fortresses, as, by this means, the nature and
form of the fortifications, and the manner in which they defend
the ground in front, may with good telescopes be correctly
ascertained ; as well as the new works that the garrison may
have thrown up, the disposition of the artillery of the place,
the communications across the ditches, and the situations of
the store-houses and other public buildings, &c.
Speaking of the use of balloonsj for the purpose of recon-
noitring fortified places which it is intended to besiege. Gay
de Vernon says in his Traite eUmentairt d'Art militaire,
SfC; that the observations mtiy be made at the distance of 1500
metres, (about 1640 yards) from the place.
