Capital (fortification)
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In fortification
Fortification
Fortifications are military constructions and buildings designed for defence in warfare and military bases. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs...

, the capital of a bastion
Bastion
A bastion, or a bulwark, is a structure projecting outward from the main enclosure of a fortification, situated in both corners of a straight wall , facilitating active defence against assaulting troops...

 is a line drawn either from the angle of the polygon to the point of the bastion, or from the point of the bastion to the middle of the gorge. The capitals are from 35 to 40 fathoms long, from the point of the bastion to the point where the two demigorges meet.
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