Professional Paper - United States Geological Survey, Ausgabe 48,Teil 1The Survey, 1906 |
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100.00 Calorific value air drying air-dried sample Analysis corrected Analysis of air-dried Appanoose County Arkansas bituminous coals boiler test briquettes Brown lignite calculated from ultimate Calorific value calculated Calorific value determined Car sample carload sample cent Character of car chemical analysis chemical laboratory coal bed Coal Company coal nut coal was loaded Coke sample coke test Combustible corrected to sample County electrical horsepower feet field Fixed carbon Ash Graphic log sheet Henryetta Hydrogen Illinois Indian Territory Iowa Kansas Kentucky Laboratory sample number lignite Loss of moisture Marion County matter Fixed carbon measured Missouri moisture on air Moisture Volatile matter Nitrogen Oxygen point where section Railroad Refuse from boiler roof to floor run-of-mine coal sample as received Sample of coal Sample Sample Samples for chemical screen Sections of coal Shale short tons specific gravity Steam sample Sulphur thickness tons of coal ultimate analysis Volatile matter Fixed Warrick County West Virginia
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Seite 56 - Equivalent evaporation from and at 212° F. per pound of dry coal
Seite 24 - ... coal or powder smoke, a cut was made across the face of the coal from roof to floor, including all of the benches of coal mined and such impurities as were not removed in ordinary work. This cut was about 3 inches wide and 1 inch deep. The coal obtained from it, amounting to 25...
Seite 13 - For analyzing and testing at the Louisiana Purchase Exposition the coals and lignites of the United States, in order to determine their fuel values and the most economic method for their utilization for different purposes, under the supervision of the Director of the United States Geological Survey...
Seite 24 - The sample was placed in an air-tight galvanized iron can, having a screw top, and the can was hermetically sealed by screwing the top down tight and covering the joint with adhesive tape. The can containing the sample was then mailed to the testing plant. When it reached the chemical laboratory, the sample was at once transferred to a glass jar, in which it was sealed until the time arrived for making a chemical analysis. By being sealed at the mine the sample reached the chemical laboratory with...
Seite 158 - The increase in the value of coal from the grade of brown lignite to that of anthracite involves both carbon and hydrogen; it depends upon an increase (or at least no diminution) in the amount of the former and a direct loss of the latter. For this reason the ideal classification should take account of both elements. "Since the percentage of hydrogen decreases as the percentage of carbon increases the two elements should not be combined by addition or by multiplication, for both of these processes...
Seite 147 - This scheme worked very satisfactorily for the Pennsylvania coals, but the selection of the name semibituminous was unfortunate, since its application is directly at variance with the true meaning of the word. The great advantage of...
Seite 177 - This end of the tube being kept cool by the protection of the circular shield and by the passage of cool air and oxygen, there is very little danger of volatile products being given off by the rubber. The other end of the tube is closed by a well-rolled cork of specially selected quality, the danger from overheating at this end of the tube being too great to permit of the use of the more convenient rubber stopper. The rear end of the tube for a distance of...
Seite 145 - ... of such a size as to yield at least 5 pounds of coal per foot of thickness of coal bed — that is, 5 pounds for a bed 1 foot thick, 10 pounds for a bed 2 feet thick, 20 pounds for a bed 4 feet thick, etc. 4. All material encountered in such a cut should be included in the sample, except partings or binders more than three-eighths inch in thickness and lenses or concretions of sulphur or other impurities greater than 2 inches in maximum diameter and one-half inch in thickness.
Seite 91 - ... prospecting for tin was carried on near the head of this canyon, but little was found. In the last 10 years some mining has been done at a mine west of this canyon and about 200 feet above the creek bed. A good small mill was on the property when it was visited in 1938. The ore is quartz with much pyrite. The mine was not in operation at the time it was visited. The area south of Silverado has some prospects, and in Santiago Canyon, just below the sharp turn in the canyon, prospecting was being...
Seite 24 - ... reduced to a size not much greater than one-half inch in diameter. The sample was placed in an air-tight galvanized-iron can, having a screw top, and the can was hermetically sealed by screwing the top down tight and covering the joint with adhesive tape.