| 摘要 |
634,684. Glass manufacture. KODAK, Ltd. Aug. 8, 1947, No. 21970. Convention date, Aug. 9, 1946. [Class 56] An optical glass consists entirely of the following ingredients, the figures being respectively those of the preferred minima (cationic), and of two examples (wt. per cent): BeO 10, 9, 6.7; CaO 10, 19, 15.1; La 2 O 3 5, 19, 43.8; B 2 O 3 50, 53, 34.4. Optical properties of the examples are given; the glasses may be coupled optically with certain of those described in Specification 606,509. |
