ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18303.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

摘要:

AbstractMany attempts have been made to account for the plasticity of clay on the basis of colloidal content. If these are warranted then one should find characteristic differences in the colloidal fractions of clay suspensions, when examined ultramicroscopically. Furthermore these differences should serve as an indication of the plasticity. Ultramicroscopic motion pictures were taken of the colloidal fractions of the aqueous suspensions of four clays having different plasticities. Marked differences were found in each instance, which indicated the relative order of the decreasing plasticity of the clays examined to be: English china clay; South Carolina kaolin; North Carolina kaolin; and fireclay semi‐flint. These results tend to support the idea that a definite relation exists between the colloidal content of a clay and its plasticity. Suggestions with reference to the extension of this work are mad

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18304.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

摘要:

AbstractBentonite is a very widely distributed clay material that is the result of the devitrification and chemical alteration of glassy volcanic ash or tuff. Bentonite should be used as the name of a rock derived from volcanic glass and it is commonly composed of the mineral montmorillonite but less often of beidellite. Its characteristic minerals are completely crystalline and have a micaceous habit, high birefringence and facile cleavage. It contains no gel colloids, and few of its crystal particles are so small as to reach “colloidal size.” It shows high adsorptive powers and this property is more dependent upon physical form than upon chemical composition. That is upon the micaceous structure and easy cleavage which give very great surface area and the‘felt‐like texture which facilitates permeability.The clay minerals of the type here described resemble the micas in many ways, but do not seem to possess the marked chemical variability of that group. A large number of analyses of the clay minerals from bentonite indicates that the most widespread of these is montmorillonite with the formula (Mg, Ca)O A12035SiO2, nH20.A reanalysis of the type montmorillonite from Montmorillon, France, gives the same formula, and the mineral has also been recognized in lithium‐bearing pegmatites and in fullers' earth.A few bentonites are composed of beidellite, a mineral first identified from the gouge clay of ore veins. It has the formula A12O3·3SiO2·nH2O wheren= about 4, and A1203may be partly replaced by Fe203.A third micaceous clay mineral has the composition of halloysite Al2O3· 2SiO2· nH2O, but it is completely and visibly crystalline and has a high

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18305.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18306.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

摘要:

AbstractA. Introduction1Beginnings and progress.2Advantages.3Location of plants.4Development of terra cotta surfaces.5Classification.B. Terra Cotta Body I. Body requisites. II. Body mixture.1Terra cotta clays.2Grog and non‐plastics.3Soluble salts and the addition of barium compounds. III. Methods of mining, handling and mixing clays.1Green spots. IV. Tempering methods. V. Aging.C. Drafting and Plaster Work I. Drafting II. Modeling and mold making.1Ashlars.2Profiles.3Old molds.4Checking the warethrough the shop.D. Pressing and Finishing I. Pressing.1Powermethods.2Hand pressing.3Absorption of water by mold. II. Finishing.1With steel.2With water brush.E. Drying I. Preliminary drying. II. Final drying.1Humidity drying.F. Slips, Glazes and Spraying I. Storage, mixing and identification of raw materials. II. Preparation of slips and glazes.1Specific gravity control.2Viscosity control. III. Spraying.1Handling ware during spraying.2Spraying technique. IV. Underslips. V. V. Glazes.1High temperature. Gloss and mats.2Low temperature.3Glaze fit and defects. Staley's coefficient of expansion factors. VI. Vitrifiedslips.G. Color Work I. Common colors.1White.2Cream.3Gray.4Tan and brown. II. Polychrome colors.1Blue.2Green.3Pink.4Black.5Low heat overglaze. III Granite Finishes. IV Pulsichrome applications. V Polychrome decoration.1Painting.2Spraying with masks.3High temperature overglaze.4Painting soluble metallic salts.H. Kilns and Firing. I. Kiln construction.1Flue arrangement.2Fire boxes. II. Setting. III. Firing. IV. Cooling and dunting. V. Composition and dunting. VI. Pacific Northwest Clayworkers' Kiln Data.I. Fitting DepartmentJ. Terra Cotta in the Wall I. Elasticity. I. Thermal coefficient of expansion. II. Thermal conductivity. III. Porosity and absorption. VI. Crysta

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18307.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

摘要:

AbstractAn effort to produce a higher quality of true porcelain at cones 10 to 12. Physical properties of body and glaze and their workabilities are observed. Tested for shrinkage, warpage, translucency, absorption and modulus of rupture.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18308.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

摘要:

AbstractIn this thesis, the effect of small additions of TiO2and Fe2O3on the fusion temperature of kaolin and fire clay is investigated.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18309.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

摘要:

AbstractA successfully tried method of stone elimination is described.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18310.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

摘要:

AbstractDescription and results of insulation are given.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18311.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1926.tb18312.x

出版商:Blackwell Publishing Ltd    

年代:1926

数据来源: WILEY