Formerly there stood in the west ward the exchequer and the stables. The exchequer was a large rectangular building, applied to the north limb of the west gatehouse, and, like it, embattled. The two ranges of stabling stood a little within and parallel to the curtains next the Clock Tower. These buildings, shown in the survey of 1650, were removed probably about 1755. Traversing the middle gate, in front is the eastern or inner ward, and on the left the inner or gatehouse of the keep. On the right, outside the curtain, is the steward’s room, and beyond it the Warder’s Tower, mentioned in 1567, but altogether remodelled and rebuilt in 1860 upon a work of 1770. It now contains the Lion gateway, leading to the gardens. Below the gatehouse is an ale-cellar, and above one side of it, attached to the offices, the confectionary. Beyond, the line of the curtain is irregular. About the salient it is Norman, 1150, and a very good example of the rough walling of the age. Upon it is the East Garret, 1309-15, and it ends in the Ravine Tower, the most eastern work of the castle, and capping an acute angle of the _enceinte_. This is a good-sized round tower, with a well-stair at its junction with the curtain. It has been much repaired since its foundation in 1309-15. It is defended by the ravine, whence it derives its name. From hence the curtain trends to the north-west, being in great part Norman, but repaired at what is called the “Bloody Gap.” Beyond this is a garret bartizan, called Hotspur’s Chair. It was the gorge of a half-round tower, now removed, but shown in the plan of 1650. Beyond this the curtain is again mixed Norman and Decorated of 1312-15, to the Constable’s Tower. This is a strong half-round tower, capping a flattish salient to the north-east; it has an exterior entrance by stairs to each of its three floors. From this a short curtain, 1150, leads to the Postern Tower, 1312-15, rectangular, pierced below by the vaulted and portcullised passage of the postern, and vaulted also on the first floor. This tower is a fine example of a Northumbrian military building of the Decorated period. The arches are round-headed or segmental, and it has in its rear wall a remarkable two-light window with a transom, and in the head a foliated circle. There is also a very perfect garderobe with external shoot. From this tower a curtain, now removed, ran upwards to the bow of the hall tower of the keep, and thus completed the defences of this ward. The original postern passage is filled up, or nearly so, with earth, but by the side of the tower a way leads to a terrace walk between the keep and the river, and extending to Falconer’s Tower.