The Broch of Kintradwell, three miles north of Brora, excavated by Rev. Dr. J. M. Joass,[81] was situated on a natural terrace close to the edge of the declivity which marks the old sea-margin of the east coast of Sutherlandshire. Previous to its excavation it was a rounded grass-covered knoll. Within this mound, formed of the debris of the structure, the basement of the broch was found entire to the height of about 14 feet. The circular wall, 18 feet in thickness, enclosed a central space 31 feet in diameter. The doorway was 7 feet high, with inclined instead of perpendicular sides, so that the width was 3½ feet at the bottom and 3 feet at the top. The entrance passage went straight through the wall, and was provided with checks for two doors, the first at 6 feet within the outer face of the wall, and the second 8 feet farther in. These checks were formed by wall-fast slabs whose edges projected, the wall being also slightly set back at their inner faces, and a corresponding slab on edge projected a few inches above the floor across the passage-way to check the bottom of the door. Between the two doors a guard-chamber opens on the right of the passage. The sill of its doorway is 2 feet above the floor, the opening 4 feet high by 2 feet wide, and the passage into the chamber 4½ feet in length. The guard-room itself is circular in form on the ground-plan, 7 feet in diameter, and 11 feet high, and roofed in the usual way by overlapping stones (Fig. 190). The whole length of the passage leading through the wall into the central area is 18 feet, and the lintels covering it are 8 inches apart. This feature is frequently seen, and as there is often a vacant space which may have formed an apartment over the lintels of the passage, the openings left between them may have had a special purpose in connection with the defence of the doorway. To the left of the main entrance was an oval-shaped chamber 11 feet long and 10 feet high, constructed in the thickness of the wall; and, still farther to the left, were the remains of the staircase, also constructed in the interior of the wall, with an oblong chamber at the stair-foot. Thirteen steps of the stair remained, but the galleries above were gone. In one side of the area was a well 7 feet deep, with steps leading down to a point 3 feet from the bottom. A stone cup (Fig. 191), presumably the common drinking-cup of the establishment, lay near the steps of the well. In its constructive features and arrangements this Broch is similar to all the others that have been described. But it also presents some features which have not hitherto been noticed, because they have either been wanting or only obscurely presented in previous examples. The inner wall of the court or central area was faced by a roughly-built wall about a foot in thickness, rising to a height of about 8 feet, and there terminating and forming a scarcement projecting from the main wall. This inner shell or