ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18941.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractThe glass‐formation region has been determined for the PbO–WO3–P2O5system ‡ and certain physical properties of representative glasses have been measured. Glasses of the system show an unusually high X‐ray and gamma‐ray absorption and are not readily discolored when exposed to X rays. Equations have been developed from which specific volumes and lead equivalents may be calculated from composition. Because of their high index of refraction and relatively low dispersion these glasses are also useful for optic

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18942.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

Cordierite bodies having virtually zero porosity when fired between 1285° and 1325°C. were obtained by using calcined blends of MgCO3, talc, and clay; the calcine was combined with raw clay to form the body. These bodies were characterized by low thermal expansion, good mechanical strength, and excellent thermal‐shock resista

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18943.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractReflectance measurements are used to evaluate the adherence of blue ground coats on sheet‐iron plates which have been tested by the drop‐hammer impact machine. The values obtained show good correlation with visual estimations of adherence of enamel on steel with and without nickel flash

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18944.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractA technique for making ethyl cellulose replicas of enameled and other surfaces is described. Photographic prints of a number of replicas made without the use of negatives are shown, and methods of analyzing the replicas are discussed.The haze of rep1icas was used to evaluate 25 enamels abraded in the standard P.E.I. surface‐abrasion test. Graphs are shown comparing these ratings with those obtained by (1) the standard method, (2) visual estimates of the abrasion as seen on the enameled specimens, and (3) visual estimates of the abrasion as seen in the replicas. The haze‐of‐replica method appears to offer advantages for evaluating the amount of abr

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18945.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractThe X‐ray diffraction technique presents a simple method for the quantitative analysis of mixtures of polymorphic forms of the same substance. The X‐ray spectrometer provides a rapid means for such work. In the case of zirconia, the relative intensities of the cubic (111) reflection and the monoclinic (111) and (111) reflections are related to the proportions of each form present. Details of the specimen preparation technique, instrument operation, and specific calibration curves are inclu

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18946.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18947.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18948.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY