GB447395A - Improvements in and relating to electric lamps - Google Patents
Improvements in and relating to electric lampsInfo
- Publication number
- GB447395A GB447395A GB2355434A GB2355434A GB447395A GB 447395 A GB447395 A GB 447395A GB 2355434 A GB2355434 A GB 2355434A GB 2355434 A GB2355434 A GB 2355434A GB 447395 A GB447395 A GB 447395A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- discharge
- auxiliary
- lamp
- sodium
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
- H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
- H05B41/22—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps having an auxiliary starting electrode
Landscapes
- Discharge Lamp (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
447,395. Discharge lamps. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London. Aug. 15, 1934, No. 23554. Void [Abridged as open to inspection under Sect. 91 of the Acts, Feb. 18, 1935]. Drawings to Specification. [Class 39 (i)] The cathode drop of a lamp is lowered by producing positive ions by an independent means, which may be an auxiliary discharge at a higher voltage than the main discharge and maintained between a thermionic or other cathode and an auxiliary anode or either of the main electrodes. In a lamp having a sodium and neon or sodium and mercury filling, the colour of the light emitted may be modified by varying the strength of the auxiliary discharge current relatively to that of the main discharge. The auxiliary cathode may be a filament surrounding the main cathode, or a ring in front of it. Two such units may be used for fullwave alternating-current operation. The lamp may be filled with inert gas, carbon dioxide, nitrogen or titanium tetra-chloride, or mercury, sodium, thallium, or cadmium vapour, or mixtures thereof, for example neon at a pressure of from 0À1 mm. to 10 mms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2355434A GB447395A (en) | 1934-08-15 | 1934-08-15 | Improvements in and relating to electric lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2355434A GB447395A (en) | 1934-08-15 | 1934-08-15 | Improvements in and relating to electric lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB447395A true GB447395A (en) | 1935-02-18 |
Family
ID=10197532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2355434A Expired GB447395A (en) | 1934-08-15 | 1934-08-15 | Improvements in and relating to electric lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB447395A (en) |
-
1934
- 1934-08-15 GB GB2355434A patent/GB447395A/en not_active Expired
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