GB449862A - Improvements in and relating to electric arc lamps - Google Patents

Improvements in and relating to electric arc lamps

Info

Publication number
GB449862A
GB449862A GB5648/36A GB564836A GB449862A GB 449862 A GB449862 A GB 449862A GB 5648/36 A GB5648/36 A GB 5648/36A GB 564836 A GB564836 A GB 564836A GB 449862 A GB449862 A GB 449862A
Authority
GB
United Kingdom
Prior art keywords
pressure
feb
envelope
class
relating
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
GB5648/36A
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
Publication of GB449862A publication Critical patent/GB449862A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/822—High-pressure mercury lamps

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Powder Metallurgy (AREA)

Abstract

449,862. Discharge lamps. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London. Feb. 25, 1936, No. 5648. Convention date, Feb. 26, 1935. [Class 39 (i)] A high-pressure metalvapour lamp has an envelope of increasing diameter towards the upper end and the upper electrode 12 farther from the top of the envelope than the bottom electrode 13 is from the bottom. The filling consists of argon at 8 mm. pressure and a small amount of mercury, the pressure during working being at least one atmosphere. The electrodes are held on tungsten supports 14 by wires 15, 17 and consist of blocks of tungsten impregnated with barium or strontium oxide or a mixture thereof. Specification 158,488, [Class 39 (i)], is referred to.
GB5648/36A 1935-02-26 1936-02-25 Improvements in and relating to electric arc lamps Expired GB449862A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8286A US2093892A (en) 1935-02-26 1935-02-26 Enclosed electric arc lamp

Publications (1)

Publication Number Publication Date
GB449862A true GB449862A (en) 1936-07-06

Family

ID=21730787

Family Applications (2)

Application Number Title Priority Date Filing Date
GB5648/36A Expired GB449862A (en) 1935-02-26 1936-02-25 Improvements in and relating to electric arc lamps
GB10747/36A Expired GB462500A (en) 1935-02-26 1936-04-14 Improvements in and relating to electric discharge devices

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB10747/36A Expired GB462500A (en) 1935-02-26 1936-04-14 Improvements in and relating to electric discharge devices

Country Status (3)

Country Link
US (2) US2093892A (en)
FR (2) FR802417A (en)
GB (2) GB449862A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213317A (en) * 1980-04-07 1989-08-09 Gen Electric Envelope for high-intensity-discharge electrodeless arc lamp

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517223A (en) * 1948-08-23 1950-08-01 Allied Chem & Dye Corp Preparation of internally oxidized catalysts
US2965790A (en) * 1949-08-20 1960-12-20 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High pressure gas lamp
US2969294A (en) * 1954-03-18 1961-01-24 James J Shyne Method of impregnating uranium in graphite
US2914402A (en) * 1957-02-26 1959-11-24 Bell Telephone Labor Inc Method of making sintered cathodes
US3271619A (en) * 1963-07-26 1966-09-06 Gen Electric Triggered vacuum discharge device
US3489602A (en) * 1965-05-25 1970-01-13 Hughes Aircraft Co Method of impregnating porous tungsten and resulting article
US3883766A (en) * 1973-07-19 1975-05-13 Gte Sylvania Inc Method of operating high-intensity arc discharge lamp
GB2173944A (en) * 1985-04-18 1986-10-22 Noblelight Limited Construction of porous impregnated cathodes for discharge tubes
GB2173943A (en) * 1985-04-18 1986-10-22 Noblelight Limited Improvements in and relating to cathodes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213317A (en) * 1980-04-07 1989-08-09 Gen Electric Envelope for high-intensity-discharge electrodeless arc lamp

Also Published As

Publication number Publication date
GB462500A (en) 1937-03-10
US2121637A (en) 1938-06-21
FR47264E (en) 1937-03-05
US2093892A (en) 1937-09-21
FR802417A (en) 1936-09-04

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