It has even been suggested that the magnets might be employed to salvage many of the German submarines which we have sunk, more particularly the coastal type of craft. These were relatively small, and for the most part were sunk in comparatively shallow water. In the water-logged condition the dead load to be handled is approximately 800 tons. If desired these craft could be lifted to the surface intact, or, if in pieces, retrieved in sections for sale as scrap. The inventor has elaborated his plans, which involve the suitable disposition of a certain number of magnets over the sunken submarines. He suggests that eight magnets would be adequate for the task. Seeing that each magnet has a pulling power of 250 pounds per square inch of its surface, the aggregate haul which could be brought to bear upon the submerged craft simultaneously by the eight magnets would be at least 1,920 tons, or twice the total weight of the submarine. With such a lifting effort available it should be possible to drag the wreck from even the extremely tenacious North Sea mud. The question arises, although recovery of such waste is admitted to offer every attraction, as to whether the German submarines are worth the trouble, even if they be sold as scrap. In view of the price which the surrendered boats realized this is extremely doubtful, although experienced salvage engineers admit that even if prevailing scrap prices were obtained the venture would prove profitable, that is in the strict commercial sense. As a scavenger for magnetic metals the lifting-magnet cannot be excelled. It is far more thorough than hand-labour, and will fulfil its mission more completely than any other mechanically-operated device to this end. Lowered to twenty-four inches of the ground it may be swept, or swung, to and fro in the certain knowledge that any stray scraps of iron and steel will readily jump the intervening space in response to the strong magnetic influence exerted. In this manner a wide area can be completely cleaned of all stray iron and steel fragments, much of which would otherwise be lost within a few moments. The recognition of the peculiar qualities of magnetic attraction has led to an interesting development which should prove capable of extensive application and to distinct commercial advantage in our steel-works. As is well known, the slag is run off separately to be dumped. But this slag often carries an appreciable quantity of metal in a divided state. Hitherto this has been wasted, but it has been found that, if the slag be broken up, by the aid of a magnet and “skull-cracker” ball, and the magnet be swept over the mass, that the fugitive metal can be retrieved and in sufficient quantities as to render the operation profitable.