They had considerable difficulty with the boiler. Its builder, David Napier, writes that they first tried to make the internal flues of cast iron, but finding that would not do they tried malleable iron, “and ultimately succeeded by various devices in getting the boiler fitted.” The _Comet’s_ first master was William Mackenzie, originally a schoolmaster at Helensburgh, and the engineer was Robert Robertson. The crew numbered eight, not forgetting a piper. According to an advertisement, “the elegance, safety, comfort, and speed of this vessel require only to be seen to meet the approbation of the public.”[32] But her speed was unsatisfactory and Bell arranged with Robertson to make alterations in the engine and paddle-wheels. She then made six miles an hour, but even this was not sufficient to attract passengers. The boat was not a financial success, and it is believed that neither the builders’ nor Robertson’s accounts were ever settled. The career of the _Comet_, indeed, was not a long one. On December 13, 1820, she was wrecked outside Crinan. She parted amidships, and while the stern drifted away the remainder of the vessel, with Bell, his crew, passengers, and machinery, stuck fast. All scrambled ashore, and the machinery was afterwards recovered. Her original engine was put to some strange uses. A Glasgow coachbuilder took it as payment for a vehicle he had previously supplied to Bell, and used it to drive the machinery in his coach-works. It then went to Greenock and was installed in a brewery. Another purchaser brought it back to Glasgow, and it ultimately came into the possession of Messrs. R. Napier and Sons of Glasgow, and Messrs. R. and J. Napier in 1862 presented it to the South Kensington Museum. [32] The _Glasgow Chronicle_, August 14, 1812. But the _Comet_ was not the only boat with which Robertson was concerned. Wood built the _Clyde_ for him in 1813, and she began her work in June of that year. She was 72 feet long with a beam of 14 feet and depth of 7 feet 6 inches, and regularly went from Glasgow to Gourock and back in about 3¹⁄₂ hours each way, including a few stoppages, on a coal consumption of 24 cwt. The _Tay_ was built for him at Dundee in 1814, but he had the engine built at Glasgow. She plied for some time between Perth and Dundee, and in 1818 was back at Glasgow, being then known as the _Oscar_. In 1814 Robertson had two other boats built at Dundee, for which he provided the engines. These were the _Caledonia_ and the _Humber_, and are thought to have been the first steamers sent from Scotland to England.