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Scientific American, Vol. 32, No. 13 (1875) (1875)

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An illustration from Scientific American, Vol. 32, No. 13 (1875), 1875, leaf 0
he next process, iron. The seggars and their contents glow with an intense the moisture in the material deposited upon it, leaving the which is white radiance, and this continues until vitrification ensues. powder in an almost dry state, adhering to the surface. CONVERTING THE WARE INTO BISCUIT, It… … ing separated by The colors used are formed by the combination of certain metallic oxides and rings of soft clay, which form a tight joint. As many as salts, with certain fluxes, which enables them to fuse into 30,000 pieces of ware may be included in one baking. The colored glasses. The oxides are…

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