Bowl of pressed mosaic glass, believed to be from Alexandria, Egypt, 1st century, Portland Vase, Roman cameo glass, 1st century. Glass has been made into practical and decorative objects since ancient times, and it is still very important in applications as disparate as building construction, housewares, and telecommunications. This was a simple example of the old rule of “getting what you measure;” for example, dilatometry data came before shrinkage models. One other assumption we made in these computations is that all the iron in the glass is present in the ferrous (Fe2 +) state. For example, in optical glasses, a wide range of compositions is required to obtain the variety of refractive index and dispersion needed if the lens designer is to produce multicomponent lenses that are free from the various faults associated with a single lens, such as chromatic aberration. The various ways in which a flame retardant can act do not occur singly but should be considered as complex processes in which many individual stages occur simultaneously, with one dominating (e.g. If contamination from the crucible material is to be minimized, then one may find pure Pt, Pt-5%Au, Pt-20%Rh crucibles quite useful. (Its optical properties, however, vary greatly, depending on the light wavelengths employed.) Eventually, by the end of the 18th century, when the technique was further developed in Ireland, the whole surface of glass was being deeply cut to reflect light. [11], Journalist Andy Beta noted a "intensifying sense of unease it evolves," elaborating that "When Noto and Sakamoto introduce an even higher sound it evokes a physical sensation akin to freezing rain suddenly turning to ice, brittle and crystalline," but also analyzed it was "infused with a warmth that slowly permeates the final moments of the piece. The mixture ignites, yielding a flame, when its composition and temperature are favorable. As a result, the composition of basalt glass varies significantly from one geographical region to another. Rough grinding is customarily performed using abrasive paper or, preferably, slurry of successively increasing grit size (generally 240, 320, 400, or 600 grit are adequate) on a rotating wheel. [13] Sputnikmusic honored it as "austere as it is brimming with creativity; an anomaly that beckons its willing listeners into immersing themselves into the chilling aura the composition will undoubtedly evoke. The Steuben Glass Company of New York produced clear glass objects, often with engraved or incised designs. The second development wave recognized sintering as a fabrication process important in special applications. Silicon dioxide (SiO2) is a common fundamental constituent of glass. Sintering: from Empirical Observations to Scientific Principles, Applications of Nonwovens in Technical Textiles, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Progress in Natural Science: Materials International, Microline (composition is of typical commercial spar).

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