CORD ANALYSIS*

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Abstract
Results on the separation of inhomogeneities in bottle glass by density differences have been improved by changes in technique and apparatus. The accuracy of chemical analysis has been increased by taking larger samples for analysis, although they represent smaller fractions of the glass. The new centrifuge is equipped with windows and a stroboscopic light so that the movement of the suspended particles may be observed as the separation takes place. It is thus possible to obtain a curve which gives the distribution in density of the particles of the powdered glass. This curve and the analysis of the fractions of the powder of extreme densities have shown considerable value in the interpretation of the causes of cordy glass. The density distribution curves, composition differences, and case histories of several bottle glass cords are discussed.