Glastechnische Berichte : Zeitschrift für Glaskunde
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- ItemGreat son of a great father - On the occasion of the 100th birthday of Erich Schott(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1991) Steiner, JürgenErich Schott was born 100 years ago, on March 29, 1891. He was the son of Otto Schott, the pioneer of modern glass technology, who had founded in 1884 in Jena, together with Ernst Abbe, Carl and Roderich Zeiss, the later-to-be Jenaer Glaswerk Schott & Gen. Erich Schott grew from early on into the tradition of glass making and, in 1927, he succeeded his father in the glassworks. For more than half a century, he controlled decisively the fortunes of the company in eventful times [1 to 4]. After World War II and the loss of the factory in Jena, Erich Schott conducted the "trek of the 41 glass makers" to the western part of Germany. The crowning event of his life's work was the reconstruction of the present Schott Glaswerke in Mainz. He laid the foundations for the development of the company into Europe's leading special-glass manufacturer. The stock of ideas of the Carl-Zeiss-Stiftung has always been the guideline of his scientific, entrepreneurial and social activities. In 1956, he was awarded the Otto-Schott-Denkmünze by the Deutsche Glastechnische Gesellschaft that, in 1971, elected Erich Schott its honorary member.
- ItemContribution to basicity of technical glass melts in relation to redox equilibria and gas solubilities(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1991) Krämer, Fritz W.To use the gas solubilities reported in the literature for binary or ternary silicate or borate melts to predict values for industrial glass melts, a basicity number concept was developed. Acidic values derived by cation-oxygen bond strengths multiplied by the mole fractions of the glass oxides were used to form a scale of basicity numbers for glass melts. The origin of this scale is the basicity number of boron oxide. This basicity number concept was successfully applied to gas solubility values for H2O, CO2, and SO2 in binary and ternary glass melts and to the solubility of oxygen in glass melts with multivalent ions, such as iron, arsenic, antimony, cerium, chromium and manganese.
- ItemInfluence of heat treatment on the crystallization process during melting and drawing of continuous basalt fibres(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1991) Lyubtchev, Lyubtcho; Liptchev, Zhivko; Davarska, Ginka[no abstract available]
- ItemSensor for oxygen activity measurements in glass melts(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1991) Müller-Simon, Hayo; Mergler, Kurt W.Traditional oxygen activity measurement in glass melts is based on Y2O3-stabilized ZrO2 which, in continuous use in the glassworks, is subjected to considerable wear. The present paper describes an oxygen sensor that is not equipped with wear parts. The new sensor is far less sensitive to temperature gradients in the surrounding area than ZrO2 sensors; the oxygen measurement, however, is greatly disturbed at direct flame irradiation.
- ItemGlass bowls made on the potter's wheel A new approach to ancient glass technology(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1991) Lierke, RosemarieEarly glass vessels were made by winding a glass thread onto a core which was fixed to a metal rod. This core-forming technique could not be used for the manufacturing of bowls, but a related procedure seems to have been employed. The investigation of spirally wound reticella bowls (3rd century BC to first half 1st century AD) has shown that they probably were made by spinning a reticella thread onto a mold on a potter's wheel. This manufacturing technique was experimentally reproduced. It is a fast and easy method, permitting a continuous production. No finishing by grinding or polishing is required. It is possible that certain other types of glass bowls, today claimed to be "cast and lathe cut" or "molded", have actually also been made on the potter's wheel. This is especially true for the so-called ribbed bowls.