A good deal of time was also spent in fixing a great many ring-bolts on various parts of the Rock and its _outlyers_, for the use of the shipping, which we expected to carry stones to the Rock the next season and in clearing a line for a permanent iron railway, about 50 yards long, from the landing wharf to the Tower, the position of which is shewn in Plate III. The railway was used for the conveyance of materials from the stone-lighters to the building, and is now the _highway_ for all the stores which pass from the wharf to the Tower. Means were also taken for laying down two cast-iron water-tanks on the Rock in tolerably sheltered positions, as shewn in Plate III. One of those tanks was completed and filled with water, but the sole-plate only of the other was fixed, as unfortunately one of the plates dropped from the vessel’s side into the water, while the seamen were lowering it into one of the boats, a loss which prevented the second tank from being finished till the next year. Those tanks, together, held about 900 gallons, and contained our chief supply of water during the whole subsequent progress of the works, when there were often about fifty men on the Rock. ~Incidents of the Season.~ I shall conclude this Chapter, by noticing a few incidents which occurred during the season of 1839, serving, in some degree to throw light upon the peculiar difficulties we had to encounter, or tending to shew the importance of the work in which the Commissioners had engaged. ~Effects of a gale from the S.W.~