11. He had a special bulb made with a metal plate sealed into the glass envelope . 12. Many HID lamps are designed to quickly extinguish if their outer UV-shielding glass envelope is broken. 13. Most tubes have glass envelopes , though ceramic and metal envelopes ( atop insulating bases ) have been used. 14. Another facet of the two pin design is that many new designs of lamps use baseless glass envelopes . 15. Capel Manor is a refinement of the'Miesian'box a glass envelope enclosing space with the lightest of touches. 16. The glass envelope in a halogen lamp can reach 1, 000 degrees, double the temperature in some ordinary lamps. 17. In the experiment a sample of radium was enclosed in a thin-walled glass envelope sited within an evacuated glass bulb. 18. The leads are taken out through the glass envelope and the whole device is put under vacuum and then sealed. 19. :Round screen CRTs are technically easier to build than rectangular-screen CRTs ( the mechanics of the glass envelope are simpler ). 20. The glass envelope is coated in a mixture of phosphors that are excited by the ultraviolet light and emit visible light.
