These floating beacons are anchored in the immediate vicinity of the numerous sand-banks which lie off the mouths of some of the principal ports of the kingdom, especially in England, and on other parts of our shores. There are numerous floating lights around our coasts, marking shoals on which lighthouses could not easily be erected. Their importance to shipping is inconceivably great. The accompanying illustration shows a vessel passing the lightship at the Nore. The impossibility of shipping getting safely into or out of the port of London without the guiding aid of lightships, as well as of buoys and beacons, may be made clear by a simple statement of the names of some of the obstructions which lie in the mouth of the Thames. There are the _Knock_ Shoals, the East and West _Barrows_, the _John_, the _Sunk_, the _Girdler_, and the _Long_ Sands, all lying like so many ground sharks waiting to arrest and swallow up passing vessels, which, unfortunately, they too often accomplish despite the numerous precautions taken to rob them of their prey. Most people know the appearance of buoys, but we dare say few have seen a buoy or beacon resembling the one in our engraving, which is a sort of cage, fastened to a buoy, with a bell inside that rings by the action of the waves. It must have been something of this sort that was used at the famous "Bell Rock" in days of yore. Lightships are usually clumsy-looking, red-painted vessels, having one strong mast amidships, with a ball at the top, about six feet in diameter, made of light laths. This ball is a very conspicuous object, and clearly indicates a lightship to the passing vessel during the day. At night a huge lantern traverses on, and is hoisted to nearly the top of, the same mast. It is lighted by a number of argand lamps with powerful reflectors. Some lightships have two masts, and some three, with a ball and a lantern on each. Some of these lanterns contain fixed, others revolving lights--these differences being for the purpose of indicating to seamen the particular light which they happen to be passing. Thus, the Goodwin Sands, which are upwards of ten miles in length, are marked by three lightships. The one on the north has three masts and three _fixed_ lights. The one on the south has two masts and two _fixed_ lights. The one that lies between the two--off Ramsgate, and named the Gull--has one mast and one _revolving_ light. The crew of a lightship consists of about nine or ten men, each of whom does duty for two months on board, and one month on shore, taking their turn by rotation; so that the number of men always on board is about seven. While on shore, they attend to the buoys, anchors, chain-cables, and other stores of the Trinity House, which has charge of all the lights, buoys, and beacons in England. They also assist in laying down new buoys and sinkers, and removing old ones, etcetera.