SEPARATION OF INHOMOGENEITIES IN BOTTLE GLASS BY DENSITY DIFFERENCES*

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Abstract
Cordy glass consisting of a mixture of fibers or laminations of various glasses of slightly differing compositions is separated in the form of powder by differences of density. These differences in general run parallel with differences of thermal expansion which produce the polariscopic appearance of cordiness. The separated fractions can be analyzed chemically, and therefore, perhaps, for the first time an estimate can be made of the chemical errors involved in the cords of the old polariscopic gradings, A, B, C. The most important features of the technique are (1) the elimination of moisture from the glass and the suspending liquid and (2) the use of a special centrifuge with accurate control of temperature.

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