The Scotts rendered similar service in the development of the mail route between Holyhead and Dublin. The first vessel built by them for this service was the _Ivanhoe_, constructed in 1820. The steam service had been opened between these two ports in 1819 by the _Talbot_, the first steamer fitted with feathering floats.[29] The _Ivanhoe_,[30] a larger steamer than the _Talbot_, was of 170 tons burden, her length between perpendiculars being 97 ft. 4 in., beam 19 ft., and depth, moulded, 14 ft. 6 in. She had various improvements in her machinery, which was of 60 nominal horse-power. She left Scotts' yard in May, 1820, and made the voyage to Howth (200 miles), in 26-1/2 hours. [Illustration: Plate IX. _From "The Life of Robert Napier."_ THE "CITY OF GLASGOW." ] Thus the Scotts continued to improve on each successive ship, and to widen the area of their influence. The Clyde continued to largely monopolise the industry of steam shipbuilding, and it was not until the summer of 1822 that a steamer--not built in Scotland--appeared on the Clyde. This was the _Saint George_, from Liverpool, and the _City of Glasgow_, already referred to, her competitor in the Liverpool trade, raced her and greatly excelled. One of the first steamers to trade in the Mediterranean was the _Superb_, sent thither in 1824, and the _Trinacria_, also built by the Scotts, followed in 1825. These ran between Naples and Palermo. The last-named vessel was 135 ft. long over-all, and 113 ft. 6 in. between perpendiculars, 39 ft. 6 in. broad over the paddle-box, and 21 ft. 10 in. net beam, 14 ft. deep (moulded), and of 300 tons burden. The vessel was especially well-equipped, and cost £15,000. The engines, the first manufactured by the Scotts at their Greenock foundry, were of 80 nominal horse-power, and the boilers, which were of copper, weighed 40 tons. The speed was 10 miles per hour. Later this steamer became the _Hylton Joliffe_, and was employed by the General Steam Navigation Company on their London and Hamburg service. As to the yard in which these several vessels were built, suggestion is afforded of the state of efficiency by the following quotation from a history published in 1829.[31] "The building yard of Messrs. Scott and Sons is allowed to be the most complete in Britain, excepting those which belong to the Crown. It has a fine extent of front from the West Quay to the termination of the West Burn, and has a large dry dock, which was altered lately to the plan of the new dock. All the stores and lofts are entirely walled in, and, independently of the building premises, they have an extensive manufactory of chain cables."