摘要:

ABSTRACTCrystalline habits of the4 alpha and beta forms of alumina are discussed. A new form designated as zeta‐alumina, which has been found only in melts containing Lic, is described. Its optical properties and X‐ray diffraction pattern are inclu

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13944.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTA possible connection between the temperature coefficient of viscosity (not the viscosity itself), the latent heat of fusion or some similar work‐function, and the absorption spectrum of liquids and glasses is discussed. The three things seem to be connected in a fairly clear and simple manner.It is shown, for instance, that from viscosity data alone it is possible to predict the position of the ultra‐violet absorption band in glasses, and the black color of pitch. Also, that at high temperatures the ultra‐violet absorption band invades the visible spectrum and migrates down into the infra‐red, and that at room temperature the viscosity of typical soda‐lime‐silica glasses is of the order 1070 poises. A meaning is attached to the term “viscosity” at temperatures at which it can not be measured mechanically, and a means of tracing it optically down to absolute ze

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13945.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTA series of experiments was made to modify the formula for light green (Victoria green) underglaze color recommended by Seger and to simplify the preparation of the stain in large quantities for terra cotta production. Four compositions were found which could be used as a substitute for Seger's underglaze green.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13946.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTThe following points are discussed in this paper: (1) green scumming, (2) black ash as a substitute for barium carbonate, and (3) colemanite overglazes for polychrcnne.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13947.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTThis paper deals with a peculiar discoloration of a typical terra cotta glaze. The method of solving the problem is outlined, and conclusions are reached which point out methods of prevention of similar defects.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13948.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTThe polishing equipment and the technique of polishing specimens of vitreous enameled metal are described. A discussion is given of the characteristics of various enamel defects which are illustrated by photomicrographs.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13949.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTThe Clarion clay in the Hope field of Vinton county is persistent over a large area, has excellent thickness, and has good mining conditions. It is a high‐grade clay approaching semiflint in character and has special adaptation for dry‐press stiff‐mud fire brick of cone 31 qu

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13950.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY