The Northmen were excellent navigators. They were, moreover, it has been claimed, the first to learn the art of sailing on the wind. They had good sea-going vessels, some of which were of large size. We have an account in the Saga of Olaf Tryggvesson of one that in some respects was remarkable. It is said that "the winter after King Olaf Tryggvesson came from Halogeland. He had a great ship built at Ledehammer,[52] which was larger than any ship in the country, and of which the beam-knees are still to be seen. The length of the keel that rested upon the grass was seventy-four ells. Thorberg Skafting was the man's name who was the master builder of the ship, but there were many others besides; some to fell the wood, some to shape it, some to make nails, some to carry timber, and all that was used was the best. The ship was both long and broad and high sided, and strongly timbered.... The ship was a dragon, built after the one that the king had captured in Halogaland, but it was far longer and more carefully put together in all her parts. The Long Serpent [her name] had thirty-four benches for rowers. The head and arched tail were both gilt, and the bulwarks were as high as in sea-going ships. This ship was the best and most costly ever built in Norway."[53] Laing computes the tonnage of this ship at about nine hundred and forty-two tons, thus giving a length of about one hundred feet, which is nearly the size of a forty-two gun ship. By steam tonnage it would give a capacity of a little less than three hundred tons, and one hundred and twenty horse power. We apprehend, however, that the estimate is sufficiently large; yet we are not concerned to show any great capacity for the Icelandic ships. All the vessels employed in the early times on the American coasts were small. Cabot sailed in Baffins Bay with a vessel of thirty tons; and the Anna Pink, the craft that accompanied Lord Anson in his expedition around the world, was only sixteen tons.[54] The vessels possessed by the Northmen were everyway adapted for an ocean voyage. In nautical knowledge, also, they were not behind the age. The importance of cultivating the study of navigation was fully understood. The Raudulf of Oesterdal, in Norway, taught his son to calculate the course of the sun and moon, and how to measure time by the stars. In 1520 Olaus Magnus complained that the knowledge of the people in this respect had been diminished. In that noble work called _Speculum Regale_ the Icelander is taught to make an especial study of commerce and navigation, of the divisions of time and the movements of the heavenly bodies, together with arithmetic, the rigging of vessels and _morals_.[55] Without a high degree of knowledge they could never have achieved their eastern voyages. THE DISCOVERY OF AMERICA.