The "Luck of Eden Hall," which has been celebrated in a ballad by the duke of Wharton, and in a second ballad written by Uhland, the German poet, and translated by Longfellow, is an enamelled goblet, kept in a leathern case dating from the times of Henry IV.
Brazil's chief industrial importance is due to its situation in the heart of the "Brazil block" coal (so named because it naturally breaks into almost perfect rectangular blocks) and clay and shale region; among its manufactures are mining machinery and tools, boilers, paving and enamelled building bricks, hollow bricks, tiles, conduits, sewer-pipe and pottery.
The vats for depositing may be of enamelled iron, slate, glazed earthenware, glass, lead-lined wood, &c. The current densities and potential differences frequently used for some of the commoner metals are given in the following table, taken from M ` Millan's Treatise on Electrometallurgy.
We have in the work of the monk Theophilus, Diversarum artium schedula, and in the probably earlier work of Eraclius, about the iith century, instructions as to the art of glass-making in general, and also as to the production of coloured and enamelled vessels, which these writers speak of as being practised by the Greeks.
The only entire enamelled vessel which we can confidently attribute to Byzantine art is a small vase preserved in the treasury of St Mark's at Venice.
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