A bstract The measurement of glass viscosities at elevated temperatures with an oscillating cylinder‐type viscometer is described. Viscosity data are presented covering those compositions in the CaO–MgO–Al 2 O 3 –SiO 2 system which contain 40% SiO 2 and which are liquid at 1500°C. The pattern of the system of isokoms presented indicates that viscosity is closely related to the ratio of basic to acidic components. Theoretical aspects of the variation of viscosity with composition in silicate‐aluminate systems are discussed in terms of silica‐alumina polymers.
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Machin et al. (1945) studied this question.
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