An investigation is made of the effect, on the elasticity and expansion behavior of a base glass containing 60%, SiO 2 and 40% Na 2 O, of replacing Na 2 O in this glass by ZnO and BaO, respectively. The elasticity and expansion factors of the two oxides, ZnO and BaO, are determined and compared with published results. Elasticity factors of 80 for ZnO, 35 for Na 2 O, and 55 for BaO are proposed. Cubical coefficient of expansion factors of 12.5 Na 2 O, 5.7 for BaO, and 1.85 for ZnO are also proposed. Neither the factors of Winkelmann and Schott nor those of English and Turner fit very well the results reported in this paper.
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Fetterolf et al. (1929) studied this question.