Having, in the foregoing article, described the implement employed in landing the stones on the Bell Rock during the year 1808, we are now to notice the crane employed in laying or building them. It appears from Mr Smeaton’s Narrative, that the implements chiefly used for building at the Edystone, were a pair of moveable sheer-poles and a set of triangles, most ingeniously applied to their respective purposes. But such implements must have come far short of the expedition which the writer had conceived to be necessary at the Bell Rock, both on account of the much greater extent of the building, and also from its foundation being so much lower in the water. After considering the subject, and making minute inquiries into the practice at various public works, he found no implement of the description, which he considered applicable to his purpose. The common sheer-poles, still chiefly in use, were recommended as having upon the whole been successfully employed at the Edystone. In some instances, the common crane, with the beam fixed at the top, at right angles to the shaft, was applied for laying heavy materials. The writer, however, laid it down as a proposition to himself, That a more effective mode of building must be adopted at the Bell Rock than had hitherto been in use, by which all the stones at any time likely to be landed in the course of a tide, might be built and secured before the artificers left the rock. The chief difficulties attending the application of the common crane in such a situation, consisted in the laying the stones perpendicularly into their respective places, as they were all of a dove-tail or angular form, as will be seen from Plate XIII. The fixed beam of the common crane was further objectionable, from its being more liable to interfere with the guy ropes. It would also have been difficult to have lifted it either laterally or perpendicularly upon the building, from one course to another. To these may also be added the great obstruction which the beam would have presented to the waves of the sea at high water. All these objections, however, were in a great measure got over, by substituting a moveable beam to work upon a bolt at the foot or lower end of the upright shaft, instead of a fixed beam at the top in the usual manner. But as we shall have occasion again to notice this machine in the operation of building, we shall here refer to Plate XIV. with its letter-press description. Three of these cranes, with moveable beams, were prepared for the work, in the course of the winter, one with an upright shaft of 28 feet in length, for laying the prepared stones upon the platform in the work-yard at Arbroath, and other two, with shafts of 21 feet, for building at the rock. [Sidenote: Sling Cart.]