摘要:

ABSTRACTCrucibles were formed from spinel raw materials and commercial spinel grains, with and without admixtures of other chemicals. Bottle glass was melted in these and the behavior was compared with similar containers made from fueclay grog and mullite (Corhart).The tests consisted of heating bottle glass in the crucibles at 1400°C for four hours and noting the appearance of the crucibles after the treatment. The results indicated that. under the conditions used, magnesia spinel is not suited for glass refractory material

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19410.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTThis investigation pertains to the detailed study of two methods used to determine alkalis in silicates. The work was prompted through the difficulty of obtaining complete decomposition of high‐alumina refractory materials by the usual procedure.It was found that high‐alumina materials may be decomposed by the J. Lawrence Smith procedure with a single fusion, provided this is conducted at approximately 1200°C.The second procedure has to do with the decomposition of the sample with a mixture of nitric, sulfuric, and hydrofluoric acids. In this method, magnesia is eliminated by precipitation with 8‐hydroxyquinoline and the alkalis are weighed as sulfates. Experimental data are given pertaining to these procedures when used for the analysis of several types of mat

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19411.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTA practical method of making screen analyses and of expressing the results is described. By the use of a second accumulation the analyses may be expressed numerically. Plotting the second accumulation data on a functional scale will allow checking the analyses for satisfactory grain‐size distributio

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19412.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTA ceramic nonplastic (specific gravity 3.01) was wet‐ground with solid‐liquid ratios of 2.7 to 1 and 1 to 15 for various lengths of time. Grain‐size distribution and surface area, as measured by the Wagner turbidimeter method, were compared. The material ground with the least water gave a lower percentage retained on a 325‐mesh screen, fewer particles between 10 and 60 microns, and more between 0 and 10

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19413.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTA method of measuring the plasticity of clays and mixtures of clays is presented. An apparatus is described by which the penetration of a constantly loaded hemisphere into a plastic clay mass during a definite time period is measured. The data indicate that the formula,d= atP, expresses the relationship betweent, the amount of penetration, during t, the time periods studied for any clay. Undoubtedly α is related to the load used, the diameter of the hemisphere, and some of the properties of the clay;P, in the formula, is a measure of the plastic properties of the clay. The data also show, through the variations in the value ofP, the marked change in plasticity of a clay caused by changes in grinding, aging, and de‐airing of a cl

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19414.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19415.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTColors may be referred to by names or by systematic symbols. Of the latter, a number of systems has been proposed during the course of years, but none has ever found general or lasting acceptance. The reasons for this are brought out in an outline of the development of such systems and in an analysis and comparison of the whole group. A history of this kind has never been drawn up before and, without it as a background, the standardization of colors and of an accepted nomenclature can not be understood. The custom of referring to colors by names is examined in detail to determine whether a more systematic and standardized usage of names is not possible.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19416.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19417.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY