This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...with CaO, the excess CaO decreases the gloss, so that if ZnO be substituted or small amounts of BaO, the gloss is increased. If the CaO is high, then increases of ZnO up to.30 eq. increase the gloss in these experiments. But if the amount of CaO present is less than that required for maximum gloss, then additions of ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...with CaO, the excess CaO decreases the gloss, so that if ZnO be substituted or small amounts of BaO, the gloss is increased. If the CaO is high, then increases of ZnO up to.30 eq. increase the gloss in these experiments. But if the amount of CaO present is less than that required for maximum gloss, then additions of ZnO up to.10 eq. increase the gloss, but with further additions, the gloss remains about equal. Since the more complex R 0 gives the more fusible glaze, and since ZnO reacts with Si02 readily, it is evident why con siderable amounts of ZnO can replace CaO without decreasing the fusibility. From these experiments, it seems that at least half of the CaO required for maximum gloss can be replaced by ZnO. When less than the maximum amount of CaO or ZnO or mixtures of both necessary to produce the highest gloss, are present in the glaze, BaO from barium carbonate decreases the gloss. But when the CaO and ZnO are present in more than the maximum amount, substituting BaO for either CaO or ZnO will increase the gloss, since it replaces excess CaO or ZnO and since it is making the R 0 more complex. This is why we find in some CaO a of the groups that a ratio of =--gives a more glossy glaze BaO 1 CaO 1 than =--, and this holds true as ZnO replaces both in the BaO 0 CaO 1 same ratio. The gloss is less when =--, and any further BaO 1 increase of BaO rapidly decreases the gloss. When Sn02 replaces CaO or ZnO, the gloss is diminished, but when it replaces BaO, the gloss remains about the same. In these experiments, when the KNaO from feldspar is replaced by equal amounts of CaO and BaO, the gloss remains equal, or decreases only slightly. Mad KXaO been replaced by CaO alone, the gloss would probably remain the same, but if replaced by BaO the gloss would have...
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