The six principal beams of the beacon were thus secured, at least in a temporary manner, in the course of two tides, or in the short space of about eleven hours and a half. The only inconveniency attending this operation, arose from the derrick for raising the first beam being rather too short. It was only thirty feet in height, whereas it was found that it would have answered better had it been about forty-five feet. We were also a good deal troubled and perplexed with the logs afloat, from having the six principal beams in two rafts: it would have been more convenient had they been lashed together in pairs, and then rafted in one lot. The writer concludes, upon the whole, that about eight hours only were actually employed in raising the beams of the beacon, and fixing them in a temporary manner. Such is the progress that may be made, when active hands and willing minds set properly to work in operations of this kind. [Sidenote: Tuesday, 22d.] [Sidenote: Four of the supporting beams set up.] Having now got the weighty part of this work over, and being thereby relieved of the difficulty both of landing and victualling such a number of men, the Smeaton could now be spared, and she was accordingly dispatched to Arbroath, for a supply of water and provisions, and carried with her six of the artificers who could best be spared. The wind to-day was due west, and blowing so fresh, that the boats had some difficulty in landing the remaining thirty-six persons at 8 A. M. who continued on the rock till half-past 12, having had four and a half hours work. During this tide four of the struts, or supporting beams, were set up, butting against the inside of four of the principal beams. These supports were each about twenty feet in length, varying somewhat according to the inequalities of the rock. At the foot they were fixed to the rock with stanchions, similar to those of the principal beams, and at the top they were connected with pieces of oak, strongly strapped with iron, collapsing around the principal beams to which they were bolted. [Sidenote: Wednesday, 23d.] [Sidenote: The boats have some difficulty in leaving the rock to-day.]