Bøger af M.A. Popescu

The earliest experimental data on an oxygen-free glass have been published by Schulz-Sellack in 1870 [1]. In 1950 Frerichs [4] investigated the glass and published the paper: "New optical glasses transparent in infrared up to 12 . Several years later he started the study of the selenium glass and prepared several binary glasses with sulphur [5].

The earliest experimental data on an oxygen-free glass have been published by Schulz-Sellack in 1870 [1]. In 1950 Frerichs [4] investigated the glass and published the paper: "New optical glasses transparent in infrared up to 12 . Several years later he started the study of the selenium glass and prepared several binary glasses with sulphur [5].