It is to these large air-chambers in bow and stern, coupled with great sheer--or rise fore and aft--of gunwale, and a very heavy keel, that the boat owes its self-righting power. The two air-chambers are rounded on the top. Now, it is obvious that if you were to take a model of such a boat, turn it upside down on a table, and try to make it rest on its two _rounded_ air-chambers, you would encounter as much difficulty as did the friends of Columbus when they sought to make an egg stand on its end. The boat would infallibly fall to one side or the other. In the water the tendency is precisely the same, and that tendency is increased by the heavy iron keel, which drags the boat violently round to its right position. The self-righting principle was discovered--at all events for the first time exhibited--at the end of last century, by the Reverend James Bremner, of Orkney. He first suggested in the year 1792 that an ordinary boat might be made self-righting by placing two watertight casks in the head and sternsheets of it, and fastening three hundredweight of iron to the keel. Afterwards he tried the experiment at Leith, and with such success that in 1810 the Society of Arts voted him a silver medal and twenty guineas. But nothing further was done until half a century later, when twenty out of twenty-four pilots lost their lives by the upsetting of the non-self-righting Shields lifeboat. Then (1850) the late Duke of Northumberland offered a prize of 100 guineas for the best lifeboat that could be produced. No fewer than 280 models and drawings were sent in, and the plans, specifications, and descriptions of these formed five folio manuscript volumes! The various models were in the shape of pontoons, catamarans or rafts, north-country cobles, and ordinary boats, slightly modified. The committee appointed to decide on their respective merits had a difficult task to perform. After six months' careful, patient investigation and experiment, they awarded the prize to Mr James Beeching, of Great Yarmouth. Beeching's boat, although the best, was not, however, deemed perfect. The committee therefore set Mr James Peake, one of their number, and assistant master-shipwright at Woolwich Dockyard, to incorporate as many as possible of the good qualities of all the other models with Beeching's boat. From time to time various important improvements have been made, and the result is the present magnificent boat of the Institution, by means of which hundreds of lives are saved every year.