A frame of boards, raised to a sufficient height above the spring-tides, and rendered water-tight by pitch and oakum, was placed above the mouth of the shaft. Its sides were supported by stout props in an inclined direction. At the top of this wooden construction, which was twenty feet in height, a platform of boards was secured, on which a windlass was placed. The water was now pumped out of the mine and the machinery set to work; but the sea penetrated through the fissures of the rock, and greatly added to the labour of the workmen, while during the winter months, on account of the swell, it was impossible to convey the tin ore to the beach. Notwithstanding all these difficulties, the persevering projector was rewarded by obtaining many thousand pounds worth of tin. At length, during a gale, an American vessel broke from her moorings, and demolished the machinery by striking against the stage, when the water rushing in filled the mine. An attempt has been made of late years to again work the mine with improved machinery, but the venture not proving profitable it has been abandoned. The travellers also visited the curious Carclaze tin mine near the town of Saint Austell. It is a prodigious hollow or basin, nearly thirty fathoms in depth and a mile in circumference, and has the appearance of a natural crater rather than a hollow made by human hands. The sides are almost perpendicular, and a few footpaths alone lead down amid the rocks to the bottom. In every direction are seen the hollows made by the miners of ancient days, the white colour of the granite veined with the darker metalliferous streaks, and the curious shape of the rocks formed by the streams flowing down its sides, give it a remarkably picturesque appearance. The machinery used for crushing the rock is set in motion by these streams. On every side the men, women, and children employed on the works are seen moving about in all directions, like a busy colony of ants. The ore is obtained without much difficulty. A tunnel has been formed at the bottom of the mine through which the waters flow after they have performed their task, which also carries away the crushed granite, while the heavier metalliferous substances are precipitated into the troughs. Neither engine-house nor chimneys such as are seen in other mines are visible, while every detail of the work is exposed to view--indeed, the huge basin has the appearance of a mine completely turned inside out.