GB525772A - Improvements in thermionic electrodes - Google Patents
Improvements in thermionic electrodesInfo
- Publication number
- GB525772A GB525772A GB659239A GB659239A GB525772A GB 525772 A GB525772 A GB 525772A GB 659239 A GB659239 A GB 659239A GB 659239 A GB659239 A GB 659239A GB 525772 A GB525772 A GB 525772A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diameter
- helix
- wire
- pitch
- wound
- 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
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
Abstract
525,772. Discharge apparatus. GENERAL ELECTRIC CO., Ltd., and FRANCIS, V. J. Feb. 28, 1939, No. 6592. [Class 39 (i)] A thermionic electrode, particularly for highpressure metal vapour discharge devices, of the type in which activating material, such as alkaline earth silicates, is contained in a perforated thick-walled canister of refractory metal, part at least of the wall of the canister is a helix of wire, not less than 15 m.m. thick wound with a pitch not exceeding 150 per cent on a mandrel whose diameter is less than twice the diameter of the wire. The pitch is preferably as near 100 per cent as possible and the diameter of the wire greater than 5 m.m. In the example shown a stick 7 of alkaline earth silicate is surrounded by a helix 1 consisting of seven turns of tungsten wire .9 m.m. in diameter close-wound on a mandrel 1 m.m. in diameter. The helix is closed at one end by a plug 8 consisting of a helix of tungsten wire .35 m.m. in diameter wound on a .5 m.m. mandrel with a pitch of 150 per cent The other end of the helix is closed by a rod 2 of tungsten, 4 m.m. long, welded to molybdenum strips 3, 4 and lead 5.. Quartz 6 is collapsed on to the parts 2 .. 5 so as to form the seal. Additional helices may be disposed outside or inside or both.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB659239A GB525772A (en) | 1939-02-28 | 1939-02-28 | Improvements in thermionic electrodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB659239A GB525772A (en) | 1939-02-28 | 1939-02-28 | Improvements in thermionic electrodes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB525772A true GB525772A (en) | 1940-09-04 |
Family
ID=9817286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB659239A Expired GB525772A (en) | 1939-02-28 | 1939-02-28 | Improvements in thermionic electrodes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB525772A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2659183A (en) * | 1950-11-13 | 1953-11-17 | Hanovia Chemical & Mfg Co | Electrical conductor for discharge devices |
-
1939
- 1939-02-28 GB GB659239A patent/GB525772A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2659183A (en) * | 1950-11-13 | 1953-11-17 | Hanovia Chemical & Mfg Co | Electrical conductor for discharge devices |
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