It was not until Monday the 13th that a landing was again effected on the rock, as the wind continued to blow strongly from the south; and the intervening four days were spent in Hynish Bay, landing in the morning, and again returning to the vessel in the evening. During this time I was engaged in making drawings of some of the lower courses of the Lighthouse Tower, with a view to fix finally upon dimensions, from which working drawings and wooden moulds for cutting the stones could be made. The only alleviation of my impatience at being detained at Hynish was the satisfaction of seeing some 20 feet of the pier founded at low water. Late in the evening of the 13th August we again landed on the Rock, when we found time, before dark, to complete the fixture of the smith’s forge, which I had been forced to leave unfinished. Even the short period of work this evening was curtailed by a very heavy shower, which drenched us to the skin--a great evil, where there are many people to be accommodated in a small vessel, without room for much spare clothing, or the means of getting any thing quickly dried. After this we had an uninterrupted tract of good weather for six days; and as we landed every morning at four o’clock, and remained on the Rock until eight, taking only half an hour for breakfast, and the same time for dinner, we had thus the work of twenty-eight persons for about ninety hours. ~Erection of the Pyramid of the wooden Barrack.~ After carefully setting out the radial directions in which the six legs, or main beams were to stand, our next step was to lay off their approximate distances from the centre of the Barrack, and to clear a space in the solid Rock of sufficient extent to admit of adjusting the exact positions of the bats before boring the holes. This operation involved the necessity of blasting parts of the Rock by very small shots, the bores being about 1¹⁄₂ inch diameter, and 15 inches in depth, and so directed as to have the effect of throwing off a thin superficial crust without shaking the solid part below. The materials thus quarried in forming the seats for each post were thrown, by means of tackle, into the deepest pools, to prevent their being driven by the sea against the timbers of the barrack, and so injuring them. [Illustration: No. 4.] [Illustration: No. 5.] ~Mode of determining the length of the Beams, and the sites for their fixtures.~