Abstract
AbstractA careful study of the viscosities of glasses composed of silica and between 22 and 40% soda shows that viscosity‐composition isotherms are smooth curves. The sharp minima at about 34% Na2O (and possibly at about 26% Na2O) observed by Preston1 are found to be entirely absent. Neither time nor shearing stress has any effect upon observed viscosities in the region investigated as long as temperature constancy has been established. A study of deviations, i.e., of individual points from the smooth isotherms, shows that these are all within the expected limits of experimental error.
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