GB434276A - Improvements in and relating to electric discharge lamps - Google Patents
Improvements in and relating to electric discharge lampsInfo
- Publication number
- GB434276A GB434276A GB298534A GB298534A GB434276A GB 434276 A GB434276 A GB 434276A GB 298534 A GB298534 A GB 298534A GB 298534 A GB298534 A GB 298534A GB 434276 A GB434276 A GB 434276A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loop
- lamp
- tungsten
- helix
- discharge lamps
- 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
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
434,276. Discharge lamps. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London, and SCOTT, W. J., 16, Oval Road, Hillmorton Paddox, Rugby. Jan. 29, 1934, No. 2985. [Class 39 (i)] In vapour discharge lamps having main electrodes operating alternately as anode and cathode, particularly double-walled high pressure mercury-vapour lamps, at least one of the electrodes consists of a wire helix of refractory material of high work-function such as tungsten, one portion of the wire being coated with oxide or other material of low work-function and an uncoated portion of the wire extending a short distance into the arc. A tungsten helix 2, Fig. 1, transverse to the axis of the lamp is coated at the parts 3 and has an enlarged uncoated turn 6. In a modification, a helix 2, Fig. 5, coaxial with the lamp has an uncoated end loop 61. This loop may contain a break 8, produced by fusing a thinned part of the loop 6<1> by a large current after exhaustion of the lamp, the lead 9, then acting as starting electrode. The turn 6 or loop 61 may carry a spike or projection of tungsten.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB298534A GB434276A (en) | 1934-01-29 | 1934-01-29 | Improvements in and relating to electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB298534A GB434276A (en) | 1934-01-29 | 1934-01-29 | Improvements in and relating to electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB434276A true GB434276A (en) | 1935-08-29 |
Family
ID=9749731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB298534A Expired GB434276A (en) | 1934-01-29 | 1934-01-29 | Improvements in and relating to electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB434276A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2774918A (en) * | 1951-10-06 | 1956-12-18 | Gen Electric | Electric discharge device |
| DE977321C (en) * | 1950-04-13 | 1965-12-16 | Gen Electric | Low-pressure gas discharge lamp and circuit arrangement for their ignition and operation |
-
1934
- 1934-01-29 GB GB298534A patent/GB434276A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE977321C (en) * | 1950-04-13 | 1965-12-16 | Gen Electric | Low-pressure gas discharge lamp and circuit arrangement for their ignition and operation |
| US2774918A (en) * | 1951-10-06 | 1956-12-18 | Gen Electric | Electric discharge device |
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