[7]About this period (1780 to 1788) there resided in Edinburgh a banker, of aristocratic birth and connection. Patrick Miller, the banker referred to, was a man of an active and ingenious mind, and, having realised a large fortune by banking, he used it as a means of enabling him to work out schemes for the benefit of the public. Having purchased an estate in the beautiful valley of the Nith, from which he derived the title of Laird of Dalswinton, he retired thither to solve the problem of navigating a vessel by some more certain means than oars and sails. He had (prior to this)[8]“exhibited a triple vessel at Leith, having rotatory paddles in the two interspaces, driven by a crank and wrought by four men. He determined one day to try its powers against a fast sailing Customs Wherry, between Inch-colm and the harbour of Leith, a distance of six or seven miles. He beat his opponent by several minutes, and was very well satisfied with the result. His boys’ tutor, a Mr. Taylor, who had taken his turn at the crank, and realised how violent was the necessary exertion, was convinced that without a more staying power than manual labour the invention would prove practically useless. He stated his objections to Mr. Miller, and they had frequent discussions on the subject. At length, one day, Taylor said ‘Mr. Miller, I can suggest no power equal to the steam engine, or so applicable to your purpose.’ The result of this suggestion was that Mr. Miller decided to fit up a new double boat, which he had recently placed on the lake at Dalswinton for the amusement of his family. Taylor made the necessary arrangements under the direction of an ingenious mechanic named William Symington. The engine was a very small one, having four-inch brass cylinders, made by George Watt, brassfounder, Edinburgh. On the 14th October, 1788, several hundreds of people assembled on the banks of Dalswinton Loch to witness the trial trip of the twin steamboat, which was entirely successful. Mr. Miller was so pleased with the success of the experiment that he resolved to repeat it on a larger scale. The following year he fitted a twin vessel 60 feet long, belonging to himself, with an engine of 18in. cylinders. This vessel steamed at the rate of seven miles an hour on the Forth and Clyde Canal, in the presence of a vast multitude of spectators. It had been Mr. Miller’s wish to try a third experiment with a third vessel, in which he should venture out on to the ocean, and attempt a passage from Leith to London. Unfortunately, he became dissatisfied with Symington, and, being vexed at the cost of fitting up the second vessel, which was much greater than he anticipated, as well as by a miscalculation, through which the machinery was made too heavy for the hulls, he hesitated to make further trial.”