GB464809A - Improvements in or relating to electric discharge devices - Google Patents
Improvements in or relating to electric discharge devicesInfo
- Publication number
- GB464809A GB464809A GB3081135A GB3081135A GB464809A GB 464809 A GB464809 A GB 464809A GB 3081135 A GB3081135 A GB 3081135A GB 3081135 A GB3081135 A GB 3081135A GB 464809 A GB464809 A GB 464809A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- discharge
- heated
- alkaline earth
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
- H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel
Landscapes
- Discharge Lamp (AREA)
Abstract
464,809. Discharge apparatus. GENERAL ELECTRIC CO., Ltd., and FRANCIS, V. J. Nov. 7, 1935, No. 30811. [Class 39 (i)] A high-pressure metal-vapour discharge device, e.g. a doublewalled mercury lamp, has at least one main thermionic electrode 4, which is heated by the discharge only and consists of, or is coated with, an electronemitting material such as an alkaline earth compound, and has also an auxiliary electrode 7 of refractory metal which is arranged near the main electrode so that some portion, preferably its end, is substantially in the centre of the discharge column whereby it is heated by the discharge, and the tendency of the starting voltage to increase materially during life is abolished or substantially reduced. The electrode 4 consists of a rod of alkaline earth oxide enclosed by a tungsten spiral which may be used to heat the electrode during manufacture. The tungsten electrode 7 is arranged at a distance of 2 mms. from the electrode 4 and comprises a coil 8 to minimize conduction of heat to the seal. Specification 412,031 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3081135A GB464809A (en) | 1935-11-07 | 1935-11-07 | Improvements in or relating to electric discharge devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3081135A GB464809A (en) | 1935-11-07 | 1935-11-07 | Improvements in or relating to electric discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB464809A true GB464809A (en) | 1937-04-26 |
Family
ID=10313496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3081135A Expired GB464809A (en) | 1935-11-07 | 1935-11-07 | Improvements in or relating to electric discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB464809A (en) |
-
1935
- 1935-11-07 GB GB3081135A patent/GB464809A/en not_active Expired
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