Bowyer Tower caps the salient of 160 degrees which breaks the north front of this ward. It is in plan half-round, flat-sided, of 45 feet diameter, 28 feet projection from the exterior of the curtain, and ranging with its interior face, here thickened by the addition of modern casemates. It had in 1597 one circular turret at its junction with its east curtain. The basement is original, and only altered by the substitution of windows for loops. In plan it is rectangular, with a bow of three faces, in each a recess for a loop, the walls being 10 feet thick. There is also a blank recess in the west wall. The entrance door is in the south side, and close east of it is a smaller door, communicating with a chamber in the east wall. Above the entrance door is a trace of a large closed-up arch in the wall. The arches are all drop pointed. The chamber is vaulted, and from its angles, without piers or corbels, spring four plain, heavy, chamfered hip-ribs, which meet, without boss or ornament, in the crown. They are of the pattern of those in Devereux Tower, and no doubt of rather early Decorated date, and probably of the reign of Edward III. The upper floor is wholly new, as is the whole casing of the exterior. Bowyer Tower was, from an early date, the residence and probably workshop of the royal maker of bows. In 1223, Grillot was making “balistas corneas”; and, for his encouragement, he had, in 1224, a robe for his wife. Soon afterwards the Archbishop of York had orders to send up Roger Balistarius, with all his implements, to the Tower, paying his expenses. Bayley gives a good perspective drawing of the interior. From Bowyer to Brick Tower, 62 feet, the curtain is lined with modern casemates, but seems in substance original, though capped with a new parapet, and cased at its exterior base. Brick Tower, in 1532 Burbidge Tower, was, in 1597, shown as a half-round, with a circular turret upon its eastern flank, in the base of which was a mural chamber, and no doubt a staircase. It appears to have been recently rebuilt from the foundation, and is now a horseshoe tower, of 44 feet diameter, and 42 feet at the gorge, applied to very ignoble purposes. Its projection from the curtain is 36 feet. The curtain from hence to Martin’s Tower, 65 feet, seems to have been rebuilt. It is casemated, and, close to the latter tower, is pierced for a staircase of twenty-seven steps, which ascends from the outer to the inner ward, and shows the point of greatest difference of level between them.