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Seite 404 - ... 4. The quantity of water. Clays with a large amount of chemically combined water sometimes exhibit a tendency to crack in burning, and may also show high shrinkage. If kaolinite is the only mineral present containing chemically combined water, the percentage of the latter will be approximately onethird that of the percentage of alumina, but if the clay contains much limonite or hydrous silica the percentage of chemically combined water may be much higher. 5. Excess of silica. A large excess of...
Seite 412 - All of the clay contained brown iron-stained streaks, but below the first 2 feet the percentage of iron-stained material is very small. For a depth of 2 feet the clay contains some organic matter, besides a considerable percentage of iron, and is very plastic. The firm, white clay below varies greatly as regards plasticity. Most of the material exposed in the various holes possesses this valuable quality to a limited extent only, but one pit on the west side of the arroyo furnishes a pure white clay...
Seite 412 - Banos and shipped to Manila. The arroyo is quite heavily wooded with hard-wood trees of large sizes, and no clearing has been done. The method of working is to sink pits about 3 feet square and 10 feet deep and then to run out low drifts into the best clay. At...
Seite 42 - The flame should be fully 20 cm high when burning free, and the determination should be made in a place free from draughts. The upper surface of the cover should burn clear, but the under surface should remain covered with carbon.
Seite 44 - The difference in results obtained by three, four, and five minutes' preliminary treatment is small and in all subsequent experimental tests the time of the preliminary heating was four minutes.
Seite 64 - Burn the portion of powdered coal used for the determination of moisture, at first over a very low flame, with the crucible open and inclined, till free from carbon. If properly treated, this sample can be burned much more quickly than the dense carbon left from the determination of volatile matter.
Seite 392 - Camansl workings is a distance of about 8 kilometers (5 miles) with a rise of 75 meters (250 feet). There is now a tramroad over this course, an heirloom from the Spanish regime; but this will need to be replaced by new rails and more clearing will have to be done before any extensive work is undertaken. The transportation problem in the other parts of the district will not be so simple and I believe overhead cables or inclined planes will be found to be necessary. Recommendations.
Seite 181 - Roots have spread out from the Tree of the Great Peace, one to the north, one to the east, one to the south and one to the west.
Seite 404 - High-grade clays show a percentage of silica, alumina, and water, approaching quite closely to those of kaolinite. 2. The refractoriness of the clay, for, other things being equal, the greater the total sum of fluxing impurities, the more fusible the clay. 3. The color to which the clay burns. This may...
Seite 42 - Place 1 gram of fresh, undried, powdered coal in a platinum crucible weighing 20 to 30 grams and having a tightly fitting cover. Heat over the full flame of a Bunsen burner for seven minutes. The crucible should be supported on a platinum triangle with the bottom 6 to 8 centimeters above the top of the burner.