GB501920A - Improvements in or relating to luminous discharge tubes - Google Patents
Improvements in or relating to luminous discharge tubesInfo
- Publication number
- GB501920A GB501920A GB2181137A GB2181137A GB501920A GB 501920 A GB501920 A GB 501920A GB 2181137 A GB2181137 A GB 2181137A GB 2181137 A GB2181137 A GB 2181137A GB 501920 A GB501920 A GB 501920A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- coil
- electrode
- electrodes
- heating coil
- 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
- H05B41/18—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 a starting switch
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
501,920. Discharge lamps. SCOPHONY, Ltd., and BARASCH, H. P. Aug. 7, 1937, No. 21811. [Class 39 (i)] A high-pressure mercury-vapour lamp has a pair of non-thermionic main electrodes and at least one auxiliary thermionic electrode in the form of a coil attached to a shank portion of a main electrode and a current is fed to a heating coil disposed outside the tube for starting purposes. In the form shown, the D.C. tube has a coil 5 of coated tungsten or molybdenum wire secured to one electrode 3 and the tube is surrounded by a heating coil 6 on a former carried by an adjustable support 9. Current is applied to the coil 6 until the discharge chamber has reached the requisite temperature and the electrodes are connected to their supply when the heating switch is opened. The two switches may be actuated simultaneously by a dash-pot member, or the two circuits may be controlled by a thermal switch. In the case of an A.C. supply two auxiliary electrodes are provided. The pressure of the mercury is at least twenty atmospheres and a tube having a discharge space 8 mm. diameter by 20 mm. may have a heating coil rated at 300 watts. Specification 488,993, [Group XXXVI], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2181137A GB501920A (en) | 1937-08-07 | 1937-08-07 | Improvements in or relating to luminous discharge tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2181137A GB501920A (en) | 1937-08-07 | 1937-08-07 | Improvements in or relating to luminous discharge tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB501920A true GB501920A (en) | 1939-03-07 |
Family
ID=10169212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2181137A Expired GB501920A (en) | 1937-08-07 | 1937-08-07 | Improvements in or relating to luminous discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB501920A (en) |
-
1937
- 1937-08-07 GB GB2181137A patent/GB501920A/en not_active Expired
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