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amount analysis August Austinville average bank beds Bertha blende brick bridge carbonate cent changes character chemical clay cºa cºa Coastal Plain color common cone consists contains Daily gage height December deposits depth developed Discharge drying elevation entirely Estimated fall February feet Fire shrinkage formation furnace gage height galenite heat inches indicates iron James January July June kiln latter lead lead and zinc less light lime limestone located lower machine manufacture March mark material Mean measurements metallic method miles mineral mines mold Month North November occur October openings original oxide passes Pleistocene present probably quantity region reported River Roanoke rock sand second-feet September shale Shenandoah shown side Silica South station stream sulphide surface temperature usually Valley Virginia weathering Wythe yard zinc
Seite 4 - ... 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 4 - ... 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 46 - ... 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 76 - ... 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 76 - ... 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 193 - 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 47 - 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 74 - 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 90 - 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.