ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15728.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

AbstractA machine was designed to place tensile loads on glass fibers having diameters from 0.6 to 0.8 millimeter (0.024 to 0.032 inch). The results of tests on twelve glasses of known chemical compositions are given. The fractured surfaces exhibited characteristic smooth and rippled areas which were measured and correlated with the breaking loads. In order to compare the various glasses, it is convenient to use that value of the load per unit area which exists in a fiber whose fractured surface shows a smooth area that is 1% of the section. For the twelve glasses tested, these values ranged from 23.0 to 33.0 kg. per mm.2(32,500 to 47,000 1b. per sq. in.) when the load on the fiber was increased at the rate of 1 pound per minute.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15729.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

AbstractThe surface tensions of liquids of widely differing viscosities have been measured by the maximum bubble‐pressure method. With liquids whose viscosities are greater than about five poises, a modification of the customary technique is employed, which consists in observing the maximum pressure at which a bubble is stable. This is the same procedure which Parmelee used. The applicability of this method for viscous liquids has been tested by measuring the surface tensions at 25° C of a series of solutions of rosin in benzyl‐benzoate whose viscosities varied from about 100 to 2500 poises. The values obtained are within 1 % of those observed by the method of capillary rise. The method has been applied to the measurement of the surface tensions of molten glasses whose viscosities varied from 50 to 2500 poises. The precision obtained is about 1%. A technique for the approximate measurement of surface tension of glasses by means of sessile drops is descr

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15730.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

AbstractIt has been observed in the manufacture of bottles of the same size and shape from various colored glasses, such as emerald green and amber and the so‐called flint bottle glass, that higher machine speeds are usually obtained in the case of the colored glasses. A laboratory test has been devised to measure the cooling rates of several colored and colorless glasses throughout their respective working ranges, which gives results paralleling the speeds obtained in actual bottle manufactur

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15731.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

AbstractAn attempt to determine the linear thermal expansion coefficient of a sample of “beta‐alumina” containing 4.47% K2O and 1.03% Na2O was unsuccessful because the expansion was irregular and not reproducible. On successive heatings, the expansion approached more and more closely that of alpha‐alumina (corundum). This observation, together with the fact that the fused‐silica parts of the expansion apparatus were badly etched during the measurements, apparently by alkali given off by the sample, gives further support to the view that “beta‐alumina” is not an allotropic form of pure alumina but is an a

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15732.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

AbstractThe failure of coke‐oven walls by slagging is described and data are presented which trace the source of the damaging material to the coal. Mechanism of failure is explained with the help of phase‐rule diagrams for the systems FeO‐SiO2and Fe a

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15733.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

AbstractThe principles of the process of fusing ceramic materials for abrasives and refractories are now rather generally known. The benefits to be derived from the additions of fused materials to a refractory are likely to be (1) an increase of chemical resistance owing to the greater density and lower permeability, (2) an increase of load‐bearing value of the product, and (3) a control of the kind and number of crystalline materials present in the grain as well as the proportion of glass contained. The term “flux” is not necessarily correctly used in connection with such fused materials, because it often applies only to a constituent which changes the proportions of the crystalline phases and does not affect the refractoriness or glass co

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15734.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

AbstractThe advantages of studying a clay by dividing it into a series of nearly nionodispersed systems are brought out. A method for carrying this out is described, using a Florida kaolin as an example. The size distribution in each fraction is measured by settling methods, and good agreement is indicated between these sizes and the microscopically measured sizes.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1938.tb15735.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY