GB478208A - Improvements in and relating to electric discharge devices - Google Patents

Improvements in and relating to electric discharge devices

Info

Publication number
GB478208A
GB478208A GB19422/36A GB1942236A GB478208A GB 478208 A GB478208 A GB 478208A GB 19422/36 A GB19422/36 A GB 19422/36A GB 1942236 A GB1942236 A GB 1942236A GB 478208 A GB478208 A GB 478208A
Authority
GB
United Kingdom
Prior art keywords
arc
magnetic field
relating
electric discharge
electrodes
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
GB19422/36A
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
Priority to GB19422/36A priority Critical patent/GB478208A/en
Priority to US152816A priority patent/US2177690A/en
Priority to FR824238D priority patent/FR824238A/en
Priority to DEP75529D priority patent/DE671795C/en
Publication of GB478208A publication Critical patent/GB478208A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/14—Magnetic means for controlling the discharge

Abstract

478,208. Discharge lamps. BRITISH THOMSON - HOUSTON CO., Ltd., and DAVIES, L. J. July 13, 1936, No. 19422. [Class 39 (i)] A high-pressure mercury-vapour discharge lamp is provided with a pair of elongated electrodes 2, 3 at least one of which is thermionic, in the form of a truncated-V, the arc being swept to and fro along their length by a magnetic field. An extended light source of high brilliancy is obtained. If the arc current is direct, the magnetic field should be alternating, and vice versa. Preferably the narrow end of the V is at the top, where the arc is naturally driven by convective forces. As shown in Fig. 3 the electrodes may be made of tungsten sheet 5 enclosing electron-emissive material 6, except for a narrow slit at the tip. The lamp may be externally heated to maintain the vapour pressure,
GB19422/36A 1936-07-13 1936-07-13 Improvements in and relating to electric discharge devices Expired GB478208A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB19422/36A GB478208A (en) 1936-07-13 1936-07-13 Improvements in and relating to electric discharge devices
US152816A US2177690A (en) 1936-07-13 1937-07-09 Electric discharge device
FR824238D FR824238A (en) 1936-07-13 1937-07-12 Improvements to discharge tubes
DEP75529D DE671795C (en) 1936-07-13 1937-07-14 Electric high-pressure discharge lamp with a constricted arc running between fixed electrodes, which is influenced by a magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19422/36A GB478208A (en) 1936-07-13 1936-07-13 Improvements in and relating to electric discharge devices

Publications (1)

Publication Number Publication Date
GB478208A true GB478208A (en) 1938-01-13

Family

ID=10129099

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19422/36A Expired GB478208A (en) 1936-07-13 1936-07-13 Improvements in and relating to electric discharge devices

Country Status (4)

Country Link
US (1) US2177690A (en)
DE (1) DE671795C (en)
FR (1) FR824238A (en)
GB (1) GB478208A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499506A (en) * 1944-09-11 1950-03-07 Gen Electric Electric discharge device and electrode therefor
US2460739A (en) * 1946-04-17 1949-02-01 Gen Electric Electrode construction
US2670451A (en) * 1950-01-12 1954-02-23 Westinghouse Electric Corp Short arc high-pressure vapor discharge lamp
US4037266A (en) * 1975-12-29 1977-07-19 Bell Telephone Laboratories, Incorporated Voltage surge protector
DE19610387A1 (en) * 1996-03-16 1997-09-18 Bosch Gmbh Robert Gas discharge lamp, in particular for motor vehicle headlights

Also Published As

Publication number Publication date
DE671795C (en) 1939-02-14
US2177690A (en) 1939-10-31
FR824238A (en) 1938-02-04

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