Final Report of the State Geologist, Band 6

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Seite 50 - 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. 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...
Seite 506 - Includes all products not otherwise classified, and those made by less than three producers, in order that the operations of individual establishments may not be disclosed.
Seite 213 - 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...
Seite 510 - REPORT ON THE CLAY DEPOSITS of Woodbridge, South Amboy and other places in New Jersey, together with their uses for firebrick, pottery, &c.
Seite 107 - ... 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 49 - ... 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. While the ultimate analysis, therefore, fails to indicate definitely what compounds .are present in the clay, still there are many facts to be gained from it. The ultimate analysis of a clay might be expressed as follows: Silica (SiO2) Alumina (A12O3) Ferric oxide .... (Fe2O3) Lime (CaO) Fluxing impurities Magnesia ....... (MgO) Alkalies..
Seite 365 - Atlantic County Bergen County Burlington County Camden County Cape May County Cumberland County Essex County Gloucester County Hudson County Hunterdon County Mercer County...
Seite 105 - 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 93 - The cracking of some fine-grained clays in drying is due partly to the surface shrinking more rapidly than the interior, because the evaporation there is greatest. As the outer portion of the product cannot stretch, it must pull apart and crack. Fire shrinkage. — All clays shrink during some stage of the burning operation, even though they may expand slightly at certain temperatures. The fire shrinkage...
Seite 57 - Coloring act on of iron in unburned clay. — Many clays show a yellow or brown coloration due to the presence of limonite, and a red coloration due to hematite; magnetite is rarely present in sufficient quantity to color the clay; siderite or pyrite may color it gray, and it is probable that the green color of many clays is caused by the presence of silicate of iron, this being specially true of glauconitic ones.

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