Bulletin of the United States Geological SurveyThe Survey., 1907 |
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1.35 specific gravity 4-INCH WATCH GLASS air drying Air of laboratory amount of moisture ash and sulphur ball mill bucking board Bunsen burner calcium chloride Calories Carl Barus Changes in moisture changes in weight Chemistry and Physics coal boiler-test sample coal samples variously coarse sample decanted Determinations of ash Division of Chemistry Earthquakes in California entire sample Estimated from results F. W. Clarke Field number fixed carbon fuel-testing plant full flame Gain in weight Geological Survey gram grinding Heavier than 1.65 hour's heating humidity inch and finer inch to inch Indiana J. A. Holmes Lighter than 1.35 lignite loosely held moisture Louisiana Purchase Exposition mechanical loss modified method moisture content Moisture determinations moisture loss official method Ohio Pennsylvania percentage portion preliminary heating Remainder results obtained sample of coal samples ground selected lumps Stirred with spoon tests Total loss United States Geological Unwashed coal boiler-test volatile matter Washed at 14-inch West Virginia Wyoming
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Seite 36 - 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 36 - 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. To find Volatile Combustible Matter, subtract the per cent.
Seite 37 - Society, but the results of their experiments are negative. (2) A different breaking down of the hydrocarbon compounds when expelled under different conditions and in the presence of variable amounts of moisture. The results of Mr. NM...
Seite 38 - 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.