GB421783A - Improvements in and relating to electric discharge lamps - Google Patents

Improvements in and relating to electric discharge lamps

Info

Publication number
GB421783A
GB421783A GB16711/34A GB1671134A GB421783A GB 421783 A GB421783 A GB 421783A GB 16711/34 A GB16711/34 A GB 16711/34A GB 1671134 A GB1671134 A GB 1671134A GB 421783 A GB421783 A GB 421783A
Authority
GB
United Kingdom
Prior art keywords
winding
resistance
electrodes
june
alternating
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
Application number
GB16711/34A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB421783A publication Critical patent/GB421783A/en
Expired legal-status Critical Current

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
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/391—Controlling the intensity of light continuously using saturable magnetic devices

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

421,783. Discharge lamps. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London. June 5, 1934, No. 16711. Convention date, June 7, 1933. [Class 39 (i)] A lamp having either a solid or liquid cathode has an auxiliary electrode between the main electrodes and connected to one of them through a capacitor, and means are provided, responsive to a discharge of the capacitor, for producing a voltage impulse between the electrodes. In one form, Fig. 1, a ring- shaped auxiliary electrode 12 is connected to the cathode 4 through a winding 13 and a capacity 15 which is charged from the mains 6, 7 through a resistance 14. The capacity 15 discharges between the electrodes 12 and 4 and a voltage surge is produced in winding 9 in the anode lead. The winding 9 and a resistance 10 serve as ballast impedance. Varying the resistance 14 controls the light intensity of the tube when an alternating- current supply is used. In a modification for use on alternating-current supply only the condenser 15 is charged through a phase controller which is varied to produce variations in illumination. The filling may comprise mercury or sodium or neon or krypton or mixtures thereof. Dimensions of a typical lamp are given. Specification 252,408, [Class 39 (i)], is referred to.
GB16711/34A 1933-06-07 1934-06-05 Improvements in and relating to electric discharge lamps Expired GB421783A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US421783XA 1933-06-07 1933-06-07

Publications (1)

Publication Number Publication Date
GB421783A true GB421783A (en) 1934-12-31

Family

ID=21920465

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16711/34A Expired GB421783A (en) 1933-06-07 1934-06-05 Improvements in and relating to electric discharge lamps

Country Status (1)

Country Link
GB (1) GB421783A (en)

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