摘要:

AbstractIt is shown experimentally that if a minute area of a large piece of glass is tested for tensile strength, the stress supported is comparable with that of fine glass fibers and is some fifty or one hundred times the “strength” of the large piece tested in any of the ordinary ways. The experiment consists in pressing a small steel ball upon the glass surface, and so stressing, in tension, a minute annular zone around the circle of cont

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1945.tb14527.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

摘要:

AbstractEnergies of dissociation into the component ions have been computed for many simple and complex oxides. From these, 51 energy constants have been obtained, which may be used to compute approximate ionic dissociation energies in crystals and glasses in which each “metallic” atom is surrounded by oxygens. The relation of these constants to the Periodic Table is shown and briefly discussed. Slight deviations from additivity in silicates and phosphates are related to the dependence of the energy on the number of oxygens in SiO4and PO4groups which are shared with other&or P at

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1945.tb14528.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

摘要:

AbstractThe quality of glass obtainable from a continuous glassmelting furnace is dependent on raw materials, fuels, furnace design and operation, and skill in the art of gathering and manipulating molten glass. Of these requirements, the content of the present paper is limited to information on furnace design and construction and its effect on the ultimate quality of the glass that can be produced when proper fuels, raw materials, and labor are employed.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1945.tb14529.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

摘要:

AbstractThe method described is based on a study to discover, collect, and classify the geometrical figures and ideas of value to artists and designers in the field of geometric or abstract art. The program includes modeling and sculpture and drawing and painting, with their applications to pottery design and decoration, and also abstract “movies.” The basis of the method is the concept of structure introduced into geometry in 1847. This geometrical structure is similar to the anatomical structure of the human hand in that one structure is capable of assuming a great variety of forms. In making a surface design, for example, the designer selects a line structure that seems to be suitable. This consists of a definite number of lines connected in definite ways but is otherwise free to take any form. The designer endeavors to throw the selected structure into a satisfactory form. To assist him are types of curves and angles suggestive of what is possible. Having a given number of lines and their connections, specific form, to be determined by the designer, is stimulative of creative activity. If variations of color over domains (areas) are to be employed, they can be designed as accurately as any other feat

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1945.tb14530.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

摘要:

AbstractDifferent glazes have been applied on steatite tubes and the influence on impact and flexural strength has been investigated. Glazes applied on tubes with very thin walls affect the thermal expansion of the ceramic body. This fact has been used to test the glaze fit.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1945.tb14531.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY

摘要:

AbstractRelief enamels must remain in relief and not flow down during maturing fire. They must also have adequate acid and abrasion resistance; they should not craze and they should accommodate as wide a color range as possible. The relief enamel developed in this study satisfies these various qualifications.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1945.tb14532.x

出版商:Blackwell Publishing Ltd    

年代:1945

数据来源: WILEY