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A differential method with an optical lever system was used to determine the thermal expansion of the glasses based on Na 2 O-SiO 2 and containing the following oxides: Al 2 O 3 , CaO, TiO 2 , ZnO, Al 2 O 3 -TiO 2 , CaO-TiO 2 , or ZnO-TiO 2 . The determination was carried out on both as-drawn and annealed rods. The influence...