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210 China trade. The Lord of the Isles was the only tea-clipper built of iron at that time. It was found that she sweated her tea cargoes, though otherwise they were delivered in excellent condition, and she was certainly a very fast vessel.

At this period (1853-1856) British iron ships, both sail and steam, were coming into favor for other trades, but their introduction had been slow. It is not easy at the present time to realize the difficulties attending the building of the first iron vessels. The rolling of iron plates to a uniform thickness was a matter requiring great care and skill, and a number of years elapsed before plates exceeded or even reached ten feet in length; then bending the frames and riveting the plates were difficult processes, only learned through much trial and experiment. In the early days, when an iron ship was completed, her owner's troubles had only begun. Finding a composition that would prevent fouling and at the same time not destroy the plates; the adjustment of compasses, and devising effective means of ventilation, were all matters that required years of investigation and labor, to say nothing of the prejudice against iron vessels, which time and experience alone could overcome. Yet it was the skilful use of this stubborn metal in the construction of ships, together with wise legislation, that enabled Great Britain to regain her empire upon the sea.