The striking feature of the castle was a tall square tower, which might be anything from seventy to a hundred feet in height; and connected with it were several stone buildings, some two stories and some three stories high. Round the castle, in a wide, irregular circle, had been built a stout stone wall, perhaps twenty feet high, wide enough on the top for half a dozen men to walk abreast. The space enclosed was tolerably flat, and large enough for a small army to exercise in. Leaning against the inside of this wall was an array of sheds, which provided stabling for the horses, and numerous stalls in which many cattle were lowing. The contour of the wall was broken by a gateway, through which the troop and their captives had entered. The inlet could be closed by a massive gate, which now stood open, and by a stout portcullis that hung ready to drop when a lever was pulled. But the most gruesome feature of this robber’s lair was a stout beam of timber, which projected horizontally from the highest open window of the square tower. Attached to the further end of the beam was a thick rope, the looped end of which encircled the drawn neck of a man, whose lifeless body swayed like a leaden pendulum, helpless in the strong breeze. Seeing the eyes of the three directed to this pitiful object, Armstrong said to one of his men,—

“Just slip that fellow’s head from the noose, Peter; we may need the rope again to-night.” Then turning to his prisoners, Armstrong spoke like a courteous host anxious to exhibit to a welcome guest the striking features of his domain.

“That’s but a grisly sight, gentlemen, to contemplate on a lowering evening.”

The day was darkening to its close, and a storm, coming up out of the west, was bringing the night quicker than the hour sanctioned.

“But here is an ingenious contrivance,” continued the freebooter, cheerfully, “which has commanded the admiration of many a man we were compelled to hang. You see there are so many meddlesome bodies in this world that a person like myself, who wishes to live in peace with all his fellows, must sometimes give the interferers a sharp bit lesson.”

“I can well believe it,” answered the king.

“An Englishman of great ingenuity had a plan for capturing us, but, as it stands, we captured him; and being a merciful man, always loth to hang, when anything else can be done, I set him at work here, and this is one of his constructions. As it’s growing dark, come nearer that you may see how it works.”

At the bottom of the tower, and close to it, there lay a wooden platform which afforded standing room for six or seven men. Peter got up on this platform and pulled a cord, which opened a concealed sluice-gate and resulted in a roar of pouring water. Gradually the platform lifted, and the king saw that it was placed on top of a tall pine-tree that had been cut in the form of a screw, the gigantic threads of which were well oiled. A whirling horizontal water-wheel, through the centre of which the big screw came slowly upwards, with Peter on the gradually elevating platform, formed the motive power of the contrivance.

“You understand the mechanism?” said Armstrong. “By pulling one cord, the water comes in on this side of the wheel and the platform ascends. Another cord closes the sluice and everything is stationary. A third cord opens the gate which lets the water drive the wheel in the opposite direction and then the platform descends. You see, I have taken away the old lower stairway that was originally built for the tower, and this is the only means of getting up and down from the top story. It does not, if you will notice, go entirely to the top, but stops at that door, fifty feet from the rock, into which Peter is now entering.”

“It is a most ingenious invention,” admitted the king. “I never saw anything like it before.”