GB416388A - Improvements in and relating to electric discharge tubes and lamps - Google Patents
Improvements in and relating to electric discharge tubes and lampsInfo
- Publication number
- GB416388A GB416388A GB740833A GB740833A GB416388A GB 416388 A GB416388 A GB 416388A GB 740833 A GB740833 A GB 740833A GB 740833 A GB740833 A GB 740833A GB 416388 A GB416388 A GB 416388A
- Authority
- GB
- United Kingdom
- Prior art keywords
- choke
- tubes
- lamps
- relating
- electric discharge
- 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
- H05B41/36—Controlling
- H05B41/44—Controlling for providing special optical effects, e.g. progressive motion of light
Landscapes
- Adjustable Resistors (AREA)
Abstract
416,388. Supplying discharge lamps. BRACKENSEY, A. H., and FRANCOBRITISH ELECTRICAL CO., Ltd., 25, Oxford Street, London. March 11, 1933, No. 7408. [Class 38 (iv).] The luminosity of a sign comprising one or more tubes is automatically varied by varying the impedance of a choke in the primary circuit without interrupting the illumination. In one form a choke is periodically short-circuited by means of a camoperated switch. In another form, a choke 1 has tapping 1<a> connected to brushes 1<b> bearing on a rotating cylinder 9 with a contact ring 11 and contact strip 10. A set of four tubes may be operated in two groups so as to produce animated or running effects without extinguishing any tube, each group comprising two tubes with their transformer primaries in parallel and a variable choke in series in the primary supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB740833A GB416388A (en) | 1933-03-11 | 1933-03-11 | Improvements in and relating to electric discharge tubes and lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB740833A GB416388A (en) | 1933-03-11 | 1933-03-11 | Improvements in and relating to electric discharge tubes and lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB416388A true GB416388A (en) | 1934-09-11 |
Family
ID=9832536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB740833A Expired GB416388A (en) | 1933-03-11 | 1933-03-11 | Improvements in and relating to electric discharge tubes and lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB416388A (en) |
-
1933
- 1933-03-11 GB GB740833A patent/GB416388A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB416388A (en) | Improvements in and relating to electric discharge tubes and lamps | |
| GB511199A (en) | Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with it | |
| GB349243A (en) | Illuminated signs | |
| GB421618A (en) | Improvements in display signs composed of electron discharge tubes | |
| GB423362A (en) | Improvements in or relating to luminous tube signs or designs operated by high frequency currents | |
| GB370107A (en) | A device for the progressive segmentary illumination of luminous electric discharge tubes | |
| GB551487A (en) | Improvements in circuit arrangements for operating electric discharge lamps | |
| GB453014A (en) | Improvements in decorative artificial lighting | |
| GB391242A (en) | Improvements to neon signs and the like | |
| GB415236A (en) | Protective arrangements for luminous discharge tube signs | |
| GB465616A (en) | Improvements in supporting means for luminous electric discharge tubes | |
| GB557301A (en) | Improvements in and relating to electric lamp sockets | |
| GB641339A (en) | Electric lighting units of the lay-light type | |
| GB395574A (en) | Luminous signs | |
| GB432726A (en) | Apparatus for the supply of electric current to neon and like luminous discharge tubes | |
| GB235690A (en) | Improvements in the control arrangements for electric lighting | |
| GB524874A (en) | Improvements in electric discharge lamps | |
| GB737938A (en) | Improvements in or relating to lighting systems embodying electric discharge tubes | |
| GB427415A (en) | Improvements in or relating to display or advertising devices | |
| GB476094A (en) | Apparatus for obtaining the appearance of handwriting or the like by means of electrical discharge luminous tubes and like devices | |
| GB463232A (en) | Improvements in and relating to signalling and like electric lamps | |
| GB419173A (en) | An improved switching arrangement for lighting installations | |
| GB494045A (en) | Improvements in and relating to animated electric discharge lamps | |
| GB683780A (en) | Improvements in and relating to lighting control systems | |
| GB268932A (en) | Improvements in or relating to signs |