[Sidenote: Difficulties of this work compared with those of the Bell Rock.] But, to enable the reader to form a comparative estimate of the difficulties attending the early stages of the Carr Rock Beacon, with those of the Bell Rock Light-house, it may be noticed, that the period which the artificers were actually at work upon the Carr Rock, as ascertained by the foreman during the first season, or the summer of 1813, was 41 hours; and in 1814, after the experience of one year’s work, these were only extended to 53 hours. Now, if we compare 1807 and 1808, the two first years’ work at the Bell Rock, we find the artificers were respectively about 180 and 265 hours upon that rock. The first two years at the Carr Rock were entirely occupied in excavating and preparing the foundation, and in laying 10 stones, or the half-course of masonry, which brings the foundation to a uniform level, for the first entire course of the building, as shewn in Plate II.; while, at the Bell Rock, in the two first seasons three courses were erected, as represented in Plate IX., of a building situate 12 miles from the shore, and measuring 42 feet in diameter at the base, besides the erection of a Beacon-house or Barrack for the workmen. The establishment for the works at the Bell Rock was of course on a much larger scale than that of the Carr Rock; but still the latter was equally effective, and the same apparatus, artificers and seamen, were employed at both. [Sidenote: Third year’s work at the Carr Rock.] During the third year’s work, or 1815, the second course of the masonry was completed upon the Carr, and nine stones of the third course had been got laid by the 3d of October, when a heavy ground-swell obliged the artificers precipitately to leave the rock and take to their boats. This swell was immediately accompanied by a gale of easterly wind, and before the cement had taken bond or firmness, the surge of the sea washed it out; when the oaken trenails, used as a temporary fixture during the progress of the work, were wrenched off, and the stone-joggles broken asunder. The whole of the nine blocks of stone were thus swept off the rock and lost in deep water, though they had been completely dove-tailed, and fitted on the same principles as the masonry of the Bell Rock Light-house, where not a single stone was lost during the whole progress of the work. [Sidenote: Fourth year’s work.]