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This process is performed almost exclusively at Swansea; and hence the copper trade of the country is confined to a few individual houses, and these are in a locality alike remote and unfrequented by the everyday tourist. At the period when the first copper-work was established on the banks of the Tawy, about a century ago, Swansea was comparatively an insignificant village.
At a copper-work which receives its pigs of copper, I think, from Warrington, we saw a plate of copper put hot between steel rollers, and spread thin; I know not whether the upper roller was set to a certain distance, as I suppose, or acted only by its weight. At an iron-work I saw round bars formed by a knotched hammer and anvil.
Sulphurous acid, we may add, is the predominant smell in a copper-work; but arsenic acid, hydrofluoric acid, and even arseniuretted hydrogen, are not at all unfrequent. Melting the Calcined Ore. This is a totally different operation from the last: in place of roasting, it is one of fusion.
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