 | Pennsylvania. Topographic and Geological Survey Commission - 1913 - 196 Seiten
...burn red of buff. Dark or black clays are usually high in organic matter and may burn red or buff. "6. The slaking of clays or the crumbling down in...only after a long time and require fine grinding." ANALYSIS OF CLAY. X There are two ways of expressing the composition of a clay from the exact chemical... | |
 | 1913 - 198 Seiten
...burn red of buff. Dark or black clays are usually high in organic matter and may burn red or buff. "6. The slaking of clays or the crumbling down in...only after a long time and require fine grinding." ANALYSIS OF CLAY. There are two ways of expressing the composition of a clay from the exact chemical... | |
 | West Virginia Geological and Economic Survey, George Perry Grimsley - 1916 - 756 Seiten
...tempered with water and dried slowly. 6. The slaking of clays or the crumbling down in the process of tempering is tested by dropping a lump of clay in...very few minutes, and so are easily tempered. Shales usually slake only after a long time, and require fine grinding. These various tests can be made by... | |
 | West Virginia Geological and Economic Survey, George Perry Grimsley - 1916 - 756 Seiten
...out and the ware may be red or buff. 6. The slaking of clays or the crumbling down in the process of tempering is tested by dropping a lump of clay in...very few minutes, and so are easily tempered. Shales usually slake only after a long time, and require fine grinding. These various tests can be made by... | |
 | 1916 - 758 Seiten
...out and the ware may be red or buff. 6. The slaking of clays or the crumbling down in the process of tempering is tested by dropping a lump of clay in...very few minutes, and so are easily tempered. Shales usually slake only after a long time, and require fine grinding. These various tests can be made by... | |
 | California. Division of Mines and Geology, California. Division of Mines - 1928 - 418 Seiten
...percentages of lime are apt to ruin the clay. Good fire bricks are made of clay low in lime content. 6. The slaking of clays, or the crumbling down in...in a very few minutes, and so are easily tempered. 7. The color of a finished clay product is largely determined by the amount of iron present. It is... | |
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Very high percentages of lime are apt to ruin the clay. It is not always possible to predict the color of the burned ware from the color of the clay. Red clays will usually burn red, blue clays may burn red or buff. Dark or black clays are usually high... 