The _Outer Ward_ is nearly semicircular, the inner ward being built upon the middle of its chord. Its parts are the great and lesser gatehouses, the curtains, the mural towers, and the offices. The inner ward has no ditch, and the space between the walls of the two wards is on the north side, 90 feet; on the west side, 60 feet; and on the south side, 80 feet. The great gatehouse is a fine pile of building. It is an oblong mass, 80 feet broad by 50 feet deep, and 62 feet high. The gateway is 11 feet high, and 8 feet broad, and has a high drop arch. It is placed in a very flat, segmental, arched recess, 20 feet high. The sill of the doorway is 12 feet above the bottom of the ditch, and on either side it is flanked by a conical round tower, 24 feet in diameter below, and 20 feet above. Above the gateway, between and on a level with the top of the towers, runs a bold machicolation of three flat arches upon two corbels. The gatehouse has a circular projection eastward towards the river; and at its north-west angle a square turret terminates in a watch-tower, which rises 93 feet above the court, and is known as “Pigin Tower” [Pigwn, Beacon]. The portals, both towards the field and towards the court, have plain chamfered ribs in ashlar; the portal vault is turned in rubble, with a portcullis groove at either end. The gates open inwards, so that the gatehouse could be defended on either side. There are also three chases in the vault, intended for the passage of gratings. The middle one appears to have been long closed up. The drawbridge dropped across the moat, here reduced 16 feet, upon a pier connected with the barbican. Entering by the great gate, on the right and left are dungeons and guard chambers, with loops commanding the approach. The doorways are small, with arches nearly half round, or very slightly pointed. One chamber on the right contains a large domed water-tank below the floor, two singular recesses in the wall, and a garderobe. A well-stair at the north-west angle leads to the first floor, which is also reached by an exterior and state staircase from the court, under which is a porter’s lodge. The subterranean chambers and those on the ground floor are vaulted.