Geological Series, Bulletin |
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Häufige Begriffe und Wortgruppen
Absorption Albemarle Albemarle county Alumina analysis April August Austinville bank beds Bench mark Bertha blende BRICKLETS Brookneal burning calamine calcite carbonate cerussite chemical clay color common brick cone Creek D. C. Humphreys Daily gage height datum December deposits Depth cent diatomaceous earth Discharge in second-feet Discharge measurements dolomite Estimated monthly discharge February feet Fire shrinkage fluorspar formation furnace galenite Geological inches iron oxide James River January July June kaolinite kiln lead and zinc Lime CaO limestone limonite machine Magnesia Magnesia MgO March miles mineral mold November October open channel conditions plasticity Potomac Precipitation Rating table residual clays Roanoke River rock Run-off sand sandy Second-ft Sept September shales Shenandoah River Silica Silica SiO2 smithsonite South Southwest Virginia sphalerite station stiff-mud sulphide surface temperature Va.-Con Valley Virginia Coastal Plain weathering Wythe county yard Zinc and Lead Zinc Mines
Beliebte Passagen
Seite 10 - ... highest. As the gage height is the mean for the day, it does not indicate correctly the stage when the water surface was at crest height and the corresponding discharge was consequently larger than given in the maximum column. Likewise in the column headed "Minimum" the quantity given is the mean flow for the day when the mean gage height was lowest. The column headed "Mean" is the average flow in cubic feet for each second during the month.
Seite 191 - The gage is located on the downstream guard rail near the center of the first span from the left bank. The length of the chain from the end of the weight to the marker is 3.5.02 feet.
Seite 10 - ... for the day when the mean gage height was highest. As the gage height is the mean for the day, it does not indicate correctly the stage when the water surface was at crest height, and the corresponding discharge was consequently larger than given in the maximum column. Likewise, in the column of "Minimum" the quantity given is the mean flow for the day when the mean gage height was lowest. The column headed "Mean" is the average flow in cubic feet for each second during the month.
Seite 52 - ... and lime (CaO), with the percentage of each given separately. The sum of these two percentages would, however, be equal to the amount of lime carbonate present.
Seite 84 - ... of any sample that will pass through a sieve of 100 or 150 meshes to the inch, since in the preparation of clays for the market by the washing process they are not required to pass through a screen any finer than the one above mentioned.
Seite 84 - ... measured by the amount of deflection of the needle of the galvanometer. Thermoelectric pyrometers are useful for measuring the rate at which the temperature of a kiln is rising, or for detecting fluctuations in the same. It is not necessary to place the galvanometer near the kiln, for it can be kept in the office some rods away. This pyrometer is not to be used as a substitute for Seger cones but to supplement them. The more modern forms have an automatic recording device. As at present put on...
Seite 205 - The channel is straight for about 1,000 feet above and below the station. Both banks are low and liable to overflow. The bed of the stream is of gravel and sand and probably...
Seite 53 - 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 be judged approximately, for clays with several per cent or more of ferric oxide will burn red, provided the iron is evenly and finely distributed in the clay, and there is no excess of lime.
Seite 82 - While the temperature of fusion of each cone is given in the preceding table, it must not be understood that these cones are for measuring temperature, but rather for measuring pyrochemical effects. Thus if certain changes are produced in a clay at the...
Seite 98 - Food adulterant; paint fillers; paper filling; electric insulators; pumps; fulling cloth; scouring soap; packing for horses' feet; chemical apparatus; condensing worms; ink bottles : ultramarine manufacture ; emery wheels ; playing marbles ; battery cups; pins, stilts and spurs for potters' use; shuttle eyes and thread guides; smoking pipes; umbrella stands; pedestals; filter tubes ; caster wheels ; pump wheels ; electrical porcelain ; foot rules; plaster; alum.