Supplément to the Treatise on ship-building. Containing extracts translated from M. Bouguer's "Traité du navire". Together with M. Duhamel's Method of finding the center of gravity. And some occasional remarks. Also an account of several experiments, made to ascertain the form of a solid that will move with the greatest velocity through the water. Likwise a method to determine the thicknefs of the plank, in the direction of planes of the timbers. With the proportions for masts, yards, caps, &c. / By Mungo Murray