GB499540A - Improvements in combinations of electric discharge devices with incandescent filaments in series with them - Google Patents
Improvements in combinations of electric discharge devices with incandescent filaments in series with themInfo
- Publication number
- GB499540A GB499540A GB41838A GB41838A GB499540A GB 499540 A GB499540 A GB 499540A GB 41838 A GB41838 A GB 41838A GB 41838 A GB41838 A GB 41838A GB 499540 A GB499540 A GB 499540A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- lamp
- series
- voltage
- devices
- 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
- H01J61/96—Lamps with light-emitting discharge path and separately-heated incandescent body within a common envelope, e.g. for simulating daylight
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
499,540. Supply systems for discharge lamps. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand-Ges. f³r Elektrische Gl³hlampen) Jan. 6, 1938, No. 418. [Class 38 (iv)] Emergency systems.-An electric discharge lamp is connected in series and structurally combined with a filament which is rendered incandescent by the discharge current and serves, at least in part, as a stabilizing resistance. The filament runs fully loaded or slightly over-loaded and means are provided whereby when the filament burns out it may be replaced,' preferably automatically. In the arrangement described, a substitute filament 8, in combination with devices 9 and 10 which break down under excess voltage, is connected in parallel with a filament 6 which normally functions in series with a H.P.M.V. lamp 1 across the supply terminals 7, 7<1>. The centre points of the filaments 6 and 8 are connected by a conductor 11 so that, as long as filament 6 remains intact, the maximum voltage across either of the devices 9 and 10 is a little less than half the mains voltage and is insufficient to cause their breakdown. A high impedance 5 is connected across electrodes 2, 2<1> of. the lamp 1 so that when, say, the half of filament 6 nearer to 7 burns out, the device 9 is connected across the supply terminals by way of the impedance 5, the intact half of filament 6 and the half of filament 8 nearer to 9. The device 9 then breaks down under full mains voltage and operating conditions are restored with half of filament 8 replacing the broken half of filament 6. If the remaining half of filament 6 breaks, the device 10 will be broken down and the whole of filament 8 brought into operation. The devices 9 and 10 are composed of oxide film which breaks down at a critical voltage. Alternatively any known means of automatically replacing a damaged filament by a sound one may be employed. If the lamp 1 is one in which an outer jacket surrounds an envelope enclosing the discharge, the filaments and all or part of the means for substitution may be located in the space between the envelope and the jacket. More than one substitute filament may be used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB41838A GB499540A (en) | 1938-01-06 | 1938-01-06 | Improvements in combinations of electric discharge devices with incandescent filaments in series with them |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB41838A GB499540A (en) | 1938-01-06 | 1938-01-06 | Improvements in combinations of electric discharge devices with incandescent filaments in series with them |
Publications (1)
Publication Number | Publication Date |
---|---|
GB499540A true GB499540A (en) | 1939-01-25 |
Family
ID=9704011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB41838A Expired GB499540A (en) | 1938-01-06 | 1938-01-06 | Improvements in combinations of electric discharge devices with incandescent filaments in series with them |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB499540A (en) |
-
1938
- 1938-01-06 GB GB41838A patent/GB499540A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4316124A (en) | Mixed light arrangement | |
GB1199899A (en) | Discharge Lamp Ballasting | |
US2344122A (en) | Electric lighting equipment | |
GB499540A (en) | Improvements in combinations of electric discharge devices with incandescent filaments in series with them | |
GB566300A (en) | Improvements in and relating to electric discharge devices | |
US2152228A (en) | Electrical incandescent lamp for series connection | |
US2272486A (en) | Gaseous discharge device and electrode assembly for use therein | |
US2081801A (en) | Incandescent electric lamp | |
GB370338A (en) | Improvements in luminous electric discharge tubes | |
GB1080606A (en) | Improvements in or relating to arc lamps | |
US2071911A (en) | Auxiliary circuit | |
GB574070A (en) | Improvements in and relating to electric lamps | |
US2146498A (en) | Automatic circuit opening device | |
US2329455A (en) | Electric lamp with connecting device | |
US2046096A (en) | Electric light source | |
ES2030054T3 (en) | INCANDESCENT ELECTRIC LAMP CONNECTED TO THE NETWORK. | |
US2359545A (en) | Circuit for electric discharge devices | |
GB511199A (en) | Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with it | |
US2043913A (en) | Photographic lamp | |
US2317061A (en) | Electric lamp | |
GB502367A (en) | Improvements in combinations of electric discharge lamps and electric incandescent lamps | |
US2295652A (en) | Incandescent electric lamp with base fuses | |
US2668930A (en) | Protective system | |
US2656488A (en) | Electric discharge device starter | |
GB612787A (en) | Improvements in or relating to devices comprising an electric gas discharge tube |