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The surfacE' tension of a series of compositions ranging from 0 to 100 percent of PbO i.n the system PbO-B20 3 and of compositions ranging from 0 to 35 percent of SiOa in the system PbO-Si02 was measured by a modification of the anchor ring method. The volatility and changes in composition of members of each system upon heating wcre found to be related to the surface tension and its change with composition. Some correlation between the tem perature coefficient of surface tension and expansivi ty was not.ed.

Surface tension of compositions in the systems PbO-B2O3 and PbO-SiO2