Should, however, the necessity arise, these numerous ship-building yards and thousands of mechanics could instantly be made available for the construction of vessels of war. If, therefore, a large naval force be still unhappily necessary, [and I am far from saying that it is not], should we not take into consideration, when we frame our naval estimates, the vast resources we have at our command in our private yards,[104] (infinitely greater as these are than those of all other nations in Europe combined), for producing on an emergency, whatever extra number of vessels of war we may then require? Our private building yards are in themselves the bases of a great fleet.[105] But the Admiralty are slow to learn. At the commencement of the century they declined even to consider the benefits to be derived by the application of steam, and even forty years afterwards, when everybody except themselves had become alive to its advantages, they refused to apply this new and now mighty power to our war ships of the line. [Sidenote: Steam between Norwich and Yarmouth, 1813;] [Sidenote: Between London and Margate, 1815.] [Sidenote: The _Glasgow_.] Happily, however, the great invention made its way without Government aid. Private enterprise carried into execution what the Admiralty would not even consider. In 1813 a steam-boat was built at Leeds, and was started to run between Norwich and Yarmouth in the months of August or September of that year. This was the second steam-vessel launched in British waters. In the same year a steamer was launched at Manchester and another at Bristol. In October 1814 another steamer commenced to ply on the Humber. In December of that year the first steamer was seen on the Thames; she was put in motion on the canal at Limehouse; and, early in 1815, a vessel with a side lever engine of 14 horse-power, constructed by Cook of Glasgow, made her way from that city to Dublin, and thence round the Land’s End to London. Though encountering great opposition from the Thames watermen, from time immemorial an obstructive class of men, she, nevertheless, commenced and successfully carried on a passenger traffic between that city and Margate. Cook had, in the previous year, in association with Bell, built two other steam-vessels, one of which, named the _Glasgow_, became in power and efficiency the standard at that time for river steamers. The public now began to appreciate the value of steamers. Prejudice vanished and travellers by them increased with such rapidity that, in 1816, it was not unusual for 500 or 600 passengers to enjoy, in the course of one day, water excursions on the Clyde.[106] [Sidenote: Early opposition to the employment of steam vessels.]