ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18679.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTThe achievements of the past owed their beauty to the artist. The excellent technique of the present is due to the efforts of the manufacturer and scientist. The latter quality has now almost superseded the former; yet the esthetic needs are eternal and can not be denied. The efforts of solitary artists are unavailing in a modern world of vast undertakings. It is for the modern factory to reintroduce the artistic spirit.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18680.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTTwenty frits were made covering the field 10–50% fused borax, 20–90% feldspar, and 0–30% calcium oxide. (1). Thesolubilitiesof the entire field were found to be less than 1.5% showing that the variations in composition in this field had less effect on the resulting solubility than the degree of smelting, and that all of the kits were sufficiently insoluble for use in glazes. The inclusion of CaO in the frit had a beneficial effect in decreasing the solubility. (2). Thefusibilitieswere found to vary from 660° to 1050°C. Substitution of CaO for feldspar up to 10%, maintaining the borax constant, increased the deformation point, but further substitution in this direction had little effect. Substitution of either CaO or feldspar for borax appeared to raise the deformation temperature about the same in either case. A large part of the field was sufficiently fusible for easy working in the fr

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18681.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTFaulty methods of adding cobalt.—Cobalt oxide or directly added cobalt sulphate frequently causes a blue‐gray cast when the body is hard fired.Correct preparations of stain from cobalt sulphate.—To 750 ounces of pure water add 15 ounces pure cobalt sulphate (CoSO4+ 7H2O) and stir until dissolved. Then add 7.5 ounces of carbonate of soda (Na2CO3) and stir thoroughly.Adding stain to body.—Ball clay must be thoroughly blunged with body before adding stain. If used in a casting slip, add the stain as a part of the casting solution.Proportions stain to body.—For a body containing 10 per cent ball clay add 75 ounces stain solution to each 1500 pounds body,i. e., ½ ounce stain for each 10 pounds body. For bodies with higher ball clay content increase the stain addition in the same ratio up to 15% ball clay.Stain in glazes.—Add 10 ounces stain to each 100 pounds dry glaze batch when same is thoroughly wet in mill. For glaze high in lead, the amount of of stain required

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18682.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTIt is shown that the terra cotta body when aged for a period of twelve days improves in plasticity, workability and strength. If the body is aged and subsequently repugged, still greater improvement is noted. This process is recommended as developing to the fullest extent the latent qualities of the body. The theory of this action seems to be a softening of the clay grains which with the retempering process results in a finer subdivision of the particles and a more intimate combmation of the clay and grog.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18683.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTBetter mixture of ingredients.—Saggers can be improved in quality by installing a mixing machine immediately following the dry pan. Thesoaking pitmay then be eliminated and the clay and water fed directly to the pug mill. This process permits oflarge tonnageand is of course also applicable to other bodie

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18684.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTA two‐compartment open‐chamber furnace with separating door operated from the outside is described. The source of heat is an electric current passed through a nichrome resistor ribbon wound over refractory supports arranged along the sides of the furnace. The front or preheating compartment is operated at 300°C and the back or finishing compartment at 900°C, with automatic control. The advantages, compared with oil heating, are: rejections reduced from 25 per cent to zero; 50 per cent increase in output for same floor space; 47.4 per cent lower fuel cost; improved quality and uniformity; lower maintenance cost and greater ease of oper

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18685.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTAmounts of NaOH absorbed by kaolins.—The amounts of sodium hydroxide completely absorbed by North Carolina, Georgia and Florida kaolins, without showing the presence of free alkali sufficient to color phenolphthalein are, respectively: 0.125%; between 0.100% and 0.125%; and between 0.225% and 0.250% of the dry weight of the clay.Effect of time and temperature on absorption.—The absorption appears to be largely independent of time but increases with temperature.Nature of the absorption process.—The experimental data can be expressed by the Freundlich adsorption isotherm thus indicating that the adsorption process belongs to the category of adsorption phen

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18686.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

摘要:

ABSTRACTGeneral Reluirementsare stated for mat, bench walls, checker work, regenerator korbels, main flues, division walls, oven chambers and jamb blocks. The followingTestsare described:—inspection, reheating tests on three qualities, bending test.Requirements and specificationsare discussed. The latter part ofthe paper deals withApparent densityandPermanent expansion.It is shown that the relation between them is a linear one and a chart is given. The average of thirty‐nine determinations gives an apparent density, for Western brick, 0.016 higher than for Pennsylvania brick, due to the fact that the Western ganister is slower to transform than the East

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18687.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1921.tb18688.x

出版商:Blackwell Publishing Ltd    

年代:1921

数据来源: WILEY