Bulletin, Ausgabe 11University of Minnesota, 1914 - 175 Seiten |
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acres air shrinkage alluvium Archean blue clay brick and tile brick per day Buff Buff Burning tests Cent Absorption cent of water cent on drying Cent Shrinkage clay becomes hard clay burns clay slakes Color Salmon common brick cone 02 COUNTY Types Cretaceous clay Decorah shale deposit feet thick Fillmore County fire clay formation Goodhue County gray clay gray drift Gray lake gray laminated clays hard at cone highly plastic Huronian kaolinite kiln Lake Agassiz lake clays layers lime limestone limestone pebbles loess material miles Minnesota River Morrison County outcrop oxide plant Pleistocene porosity pounds per square Railroad range of vitrification rapidly dried reaches viscosity red brick red drift Redwood County requires residual clay river clays rock Salmon sample sand sandy shows Shrinkage Per Cent Silica slakes at once square inch Stearns County stiff-mud temperature tensile strength Types of clay viscosity at cone ware water for molding
Beliebte Passagen
Seite 125 - Silurian, the top of the whole being thinly and irregularly covered over and chinked up with coarse drift. The Lower Silurian is more or less broken and tilted, at least the bedding seems to have been cut out into huge blocks by divisional planes, which, either by weathering or water-wearing, were widened, the blocks themselves being subsequently thrown to some extent from their horizontality, tipping in all directions. The opened cracks and seams were then filled with the Cretaceous clay, which...
Seite 151 - A concretionary marl, or apparently limy earth, of a white color, crumbles out under the projecting' turf. It appears in fragments of an inch or two or sometimes larger, with angular outline. The surfaces of these pieces show a great number of round or oval spots or rings, which seem to be formed by the sections of concretions inclosed in the mass. It is rather hard when dry and nearly white. It is associated with a blue clay, the relations of which can not here be made out.
Seite 152 - At a point a little farther up this creek appears a heavy deposit of concretionary, rusty marl * * * in heavy beds that fall off in large fragments like rock. The first impression is that the bluff is composed of ferruginous conglomerate, but there is not a foreign pebble in it. Every little round mass has a thin shell which is easily broken, revealing either a cavity or a loose, dry earth. These concretions are generally not more than one-fourth or onehalf inch in diameter; seen 18 feet.
Seite 17 - ... filter tubes; caster wheels; pump wheels ; electrical porcelain ; foot rules ; plaster ; alum. "Refractory wares. Crucibles and other assaying apparatus; gag retorts; fire bricks; glass pots; blocks for tank furnaces; saggers; stove 1.
Seite 17 - Domestic. Porcelain, white earthenware, stoneware, yellow ware and Rockingham ware for table service and for cooking, majolica stoves: polishing brick, bath brick, fire kindlers. "Structural. Brick: common, front, pressed, ornamental, hollow, glazed, adobe; terra cotta; roofing tile- ; glazed and encaustic tile; drain tile; paving brick; chimney flues; chimney pots; doorknobs; fireproofing; terra-cotta lumber; copings; fence posts.
Seite 17 - Urinals, closet bowls, sinks, washtubs, bath tubs, pitchers, sewer pipe, ventilating flues, foundation blocks, vitrified bricks. Decorative. — Ornamental pottery, terra cotta, majolica, garden furniture, tombstones. Minor Uses. — Food adulterant ; paint fillers ; paper filling; electric insulators ; pumps; fulling cloth ; scouring soap ; packing for horses...
Seite 125 - ... due to the greater effect of water. The rounded surface of these huge masses of Lower Silurian is coated with a thickness of about a half inch, or an inch and a half, of iron ore, which scales off easily, and is easily broken by the hammer. While this scale of iron ore is thicker near the top...
Seite 79 - Titanium oxide— -_ -.. .62 100. 33 100.0 The Cretaceous clays of Brown County vary in properties, but some of them are very promising, and well records indicate that they are present throughout most of the southern part of the county and in some places are 200 feet in thickness. Clay-bearing formations CABLTON COUNTY. Recent: Alluvium. Pleistocene: Gray laminated clay.
Seite 65 - ... Most of the pits opened are said to be pockety. Uniformity in the products manufactured is easily attained, however, by mixing clay from several parts of a fairly large exposure. A similar clay, probably of like origin, occurs in a less desirable situation in the southeastern part of Minneapolis. The clay slakes at once and is highly plastic, requiring 24 per cent of water for molding. Its tensile strength is about 200 pounds to the square inch and its air shrinkage 3.7 per cent. The United States...
Seite 125 - The clay is uniformly bedded, about horizontally, with some slope in accordance with the surface on which the sedimentation took place. But the most interesting and important feature is the condition of these old Cambrian surfaces. They are rounded by the action of the water, evidently waves. The cavities and porous spots are more deeply eroded, making little pits on the face of the rock ; or, along the lines of section of the sedimentation planes with the eroded surface, there are furrows due to...