 | Pennsylvania. Topographic and Geological Survey Commission - 1913 - 196 Seiten
...leaching with sul phuric acid, and many other purposes. Simple Tests Useful in Prospeeting for Clayi. "1. A small lump of clay may be roasted in a blue...the clay, the percentage of iron is high, probably 4 per cent. or more. Fire clays are low in iron. "2. By tasting a bit of the clay, bitter salts, alum... | |
 | 1913 - 198 Seiten
...leaching with sulphuric acid, and many other purposes. Simple Tests Useful in Prospecting for Clayi. "1. A small lump of clay may be roasted in a blue...the clay, the percentage of iron is high, probably 4 per cent. or more. Fire clays are low in iron. "2. By tasting a bit of the clay, bitter salts, alum... | |
 | West Virginia Geological and Economic Survey, George Perry Grimsley - 1916 - 756 Seiten
...determined by very careful prospecting. A few simple tests may prove valuable in this prospecting work. 1. A small lump of clay may be roasted in a blue gas...of iron is high, probably four per cent, or more. 2. By tasting the clay, bitter salts may be detected, or they may occur as white coatings on the outcrop... | |
 | West Virginia Geological and Economic Survey, George Perry Grimsley - 1916 - 756 Seiten
...determined by very careful prospecting. A few simple tests may prove valuable in this prospecting work. 1. A small lump of clay may be roasted in a blue gas...of iron is high, probably four per cent, or more. 2. By tasting the clay, bitter salts may be detected, or they may occur as white coatings on the outcrop... | |
 | 1916 - 758 Seiten
...determined by very careful prospecting. A few simple tests may prove valuable in this prospecting work. 1. A small lump of clay may be roasted in a blue gas...of iron is high, probably four per cent. or more. 2. By tasting the clay, bitter salts may be detected, or they may occur as white coatings on the outcrop... | |
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A few simple tests will be given to aid in this preliminary prospecting work. 1. A small lump of clay may be roasted in a blue gas flame, as in a gas stove ; if a red or brown color be given to the clay, the percentage of iron is high, probably four per... 