BAS'TION, n. bas'chun. A huge mass of earth, usually faced with 56sods, sometimes with brick, or stones, standing out from a rampart, of which it is a principal part; formerly called a bulwark. Bastions are solid or hollow. A flat bastion is made in the middle of the curtain, when it is too long to be defended by the bastions in its extremes. A cut bastion has its point cut off and instead of it a re-entering angle, or an angle inwards, with two points outward. A composed bastion has two sides of the interior polygon unequal, which makes the gorges unequal. A demibastion is composed of one face only, which makes the gorges unequal. A demibastion is composed of one face only, with one flank and a demigorge. A double bastion is one raised on the plane of another. |
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