The Philippine Journal of Science, Band 2

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National Science Development Board., 1907
 

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Seite 183 - 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 42 - Page 704. tnination should be made in a place free from drafts. The upper surface of the cover should burn clear, but the under surface should remain covered with carbon...
Seite 42 - Place 1 gram of pure bitumen in a "platinum crucible weighing 20 or 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 cm. above the top of the burner. The flame should be fully 20 cm.
Seite 411 - The term clay is applied to a natural substance or rock which, when finely ground and mixed with water, forms a pasty, moldable mass that preserves its shape when air-dried and when burned, changes to a hard, rock-like substance by the coalescence of its particles through softening under the action of heat.
Seite 57 - It might perhaps be said that the more lignitic the character of the coal, the greater the possibility of its including a large percentage of water, but in general the percentage varies with the exposure of the coal, the season of the year, and the state of the weather. It...
Seite 46 - ... determination of magnesia, as large variations could be obtained by exposing the crystalized double phosphate to varied conditions ; and yet this determination, properly executed, is one of the most accurate known in analysis. It is easily seen that the following elements will modify the result of the amount of volatile matter driven off from a sample of coal contained in a covered platinum crucible : weight of coal and of crucible; degree and duration of heat; condition of coal. I hope to show...
Seite 416 - ... and there is no excess of lime. The above conditions will be affected by a reducing atmosphere in burning, or the presence of sulphur in the fire gases. 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.
Seite 426 - 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 416 - 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 426 - ... limited extent only, but one pit on the west side of the arroyo furnishes a pure white clay highly prized by the workmen, which is much more plastic. Sample No. 6, taken from the largest pit on the east side of the arroyo, represents the first class, while No. 7 is a sample of the more plastic clay. It was impossible for me to determine the extent of this bed of clay owing partly to the limited time at my disposal and partly to want of exposures or extensive development work. But from surface...

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