Dead-angle. Every angle is so called, that points inwards, or is not well defended.
Angle of the ditch, is formed before the centre of the curtain, by the outward line of the ditch.
| Angle rentrant, | - | |
| Re-entering angle, |
is any angle whose point turns inwards, or towards the place; that is, whose legs open towards the field.
Saliant angle, is that which points outwards or whose legs open towards the place.
Angle of the complement of the line of defence, is the angle formed by the intersection of the two complements with each other.
Inward flanking angle, that which is made by the flanking-line and the curtain. See [Angle].
Names of the solid works of a Fortification.
| Advanced-foss, | - | |
| Avant-fossé, |
or ditch, made at the foot of the glacis: it is but very seldom made, because it is easily taken, and serves for a trench to the besiegers.