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acid air shrinkage Alkalis alumina amount anal analysis bined Free blue clay brick clay brick yard Bros burned clay carbonate clay bank clay contains clay deposit clay substance coal color common brick composition cone Cretaceous drain tile dried dry press feet thick feldspar Ferric oxid fire brick fire clay Flint clay fluxes fusibility geol glaze grains gray hardpan heat Hudson Ibid incipient fusion iron kaolin kaolinite kiln latter layers lime Long Island Magnesia manufacture mass material method mica mile mineral mixture molded occur orthoclase overlain particles paving brick plastic clay porcelain portion pottery pounds a square pressed brick quartz railroad refractory rep't river sandy scove-kilns Seger sewer pipe shale silica soft mud machine square inch Staten Island stiff mud stoneware stratified sulfates sulfuric sulfuric acid surface temperature tempering tensile strength terra cotta underlain upper valley vitrification ware washed yellow York
Seite 558 - If .08 and 1 are bent over and 5 is not affected, the temperature of the kiln is between 1 and 5. The next time numbers 2, 3 and 4 are put in, and 2 and 3 may be fused, but 4 remains unaffected, indicating that the temperature reached the fusing point of 3.
Seite 800 - Fig. 1, is about 700 feet long, and to utilize the space thoroughly it is broken up into sections (50 feet each is a good length), these being arranged parallel and connecting at the ends, so that the water, with suspended clay, follows a zigzag course. The troughing has a slight pitch, commonly about one inch in 20 feet, but the amount depends on the kaolin and whether the contained sand is fine or coarse. If the kaolin is very fine and settles slowly, the pitch need not be so great, and vice versa....
Seite 805 - I ij ! = r ally works the mass up into the desired form. After being shaped, the object is then detached from the wheel by running a thin wire underneath it, and it is set aside to dry. Crocks, jugs, and similar articles are turned. This is the method almost invariably employed for molding earthenware and frequently employed in forming stoneware articles. An expert potter is able to turn jars of very large size.
Seite 554 - F.), and the upper member of the series is cone 36, which is composed of a very refractory clay slate, while cone 35 is composed of kaolin from Zettlitz, Bohemia.
Seite 748 - QUANTITY OF THE CHARGE. The quantity of the charge shall be estimated by its bulk and not its weight. The bulk of the standard charge shall be equal to...
Seite 544 - The amount of water required to develop the maximum plasticity varies. If too little is added, the clay cracks in molding and is stiff and hard to work. If too much water is used, the paste becomes soft and retains its shape with difficulty. Lean clays usually require less water to produce a workable paste than fat ones.
Seite 627 - ... very calcareous; those of the southwestern and western parts are moderately so, while those in the central portion are low in lime. The products at present manufactured from the Wisconsin clays consist chiefly of brick and tile, but clays suitable for other grades of ware are said to exist. WYOMING. All the clays of Wyoming that have any commercial importance occur in the sedimentary beds of the Jurassic and Cretaceous formations, but are also found to some extent in the Tertiary.
Seite 801 - ... times the width, and divided by several longitudinal partitions. The water and the clay then pass into a third section, twice as wide as the second, and divided by twice the number of longitudinal divisions. By this means the water moves only in a straight course, but as it is being continually spread out over a wider space, it flows with an ever-decreasing velocity.
Seite 802 - Such screens are barrel-shaped, and the water, with the kaolin in suspension, is discharged into the interior and passes outward through the screen cloth. As the screen revolves the dirt caught is carried upward and finally drops; but, instead of falling down on the other side of the screen, it falls on a board, which diverts it out to the ground. The settling tanks, into which the kaolin and...
Seite 802 - Two kinds of screens can be used — the first stationary, the second revolving. The stationary screen is simply a frame covered with a copper cloth and set at a slight angle. The water and suspended kaolin fall on the screen and pass through, otherwise they run off and are lost. A slight improvement is to have two or three screens overlapping one another, so that whatever does not get through the first will fall on the second. If the vegetable matter and sticks are allowed to accumulate they clog...