The eastern ward contained the castle chapel and the conduit, supplied with water by lead pipes from an exterior spring called Howling Well. The chapel, a considerable building, stood detached near the Bloody Gap, and was removed in 1755. The ecclesiastical establishment seems to have been on a respectable scale, and included a chantry for the performance of the obits of the family. In this quarter also stood the brew, bake, and slaughter-houses for the use of the garrison. Alnwick Castle is probably the finest extant example of a Norman castle of this type, having an open keep and a complete _enceinte_; for although most of the present buildings are either of the fourteenth or the nineteenth century, the plan is certainly Norman, and certain detached portions of the construction. It seems also that the keep was never a mere shell, like Cardiff or Arundel, but was always set about with towers and provided with a handsome gatehouse. A notable feature is the use of the round-headed and the segmental arch in the Decorated period. This is not uncommon in the North of England. The very free use of stone warriors upon the parapets, carried to an absurd extent in the repairs of the last century, is also remarkable. They are seen at Bothal, and in Edwardian works both at Caernarvon and Chepstow, but by no means so freely distributed as here. They were obviously intended for ornament only, but, of all figures, that of the eagle at Caernarvon is the only one at all appropriate. No archer would or could have stood on the crest of the parapet. Most of the later figures were very properly removed by Mr. Salvin. There is found upon the battlements of both walls and towers, in various parts of the castle, a convenient arrangement for hanging a movable wooden shutter in the embrasures, so as to defend the warders from a Scottish shaft, and from the scarcely less keen edge of the bleak winds of the Border. The shutter was suspended horizontally, like a port-lid, but from trunnions, of which one rested in a round hole in one merlon, and the other in a similar hole terminating in a groove in the other, so that the shutter hung freely, and could be lifted in and out if necessary. The arrangement is precisely that applied to the roller of a round towel. Traces of this arrangement remain in various parts of the castle. A perfect example is seen on the barbican. It may also be seen on the east wall of Goderich, at Chepstow, and elsewhere.