GB464809A - Improvements in or relating to electric discharge devices - Google Patents

Improvements in or relating to electric discharge devices

Info

Publication number
GB464809A
GB464809A GB3081135A GB3081135A GB464809A GB 464809 A GB464809 A GB 464809A GB 3081135 A GB3081135 A GB 3081135A GB 3081135 A GB3081135 A GB 3081135A GB 464809 A GB464809 A GB 464809A
Authority
GB
United Kingdom
Prior art keywords
electrode
discharge
heated
alkaline earth
heat
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
GB3081135A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3081135A priority Critical patent/GB464809A/en
Publication of GB464809A publication Critical patent/GB464809A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel

Landscapes

  • Discharge Lamp (AREA)

Abstract

464,809. Discharge apparatus. GENERAL ELECTRIC CO., Ltd., and FRANCIS, V. J. Nov. 7, 1935, No. 30811. [Class 39 (i)] A high-pressure metal-vapour discharge device, e.g. a doublewalled mercury lamp, has at least one main thermionic electrode 4, which is heated by the discharge only and consists of, or is coated with, an electronemitting material such as an alkaline earth compound, and has also an auxiliary electrode 7 of refractory metal which is arranged near the main electrode so that some portion, preferably its end, is substantially in the centre of the discharge column whereby it is heated by the discharge, and the tendency of the starting voltage to increase materially during life is abolished or substantially reduced. The electrode 4 consists of a rod of alkaline earth oxide enclosed by a tungsten spiral which may be used to heat the electrode during manufacture. The tungsten electrode 7 is arranged at a distance of 2 mms. from the electrode 4 and comprises a coil 8 to minimize conduction of heat to the seal. Specification 412,031 is referred to.
GB3081135A 1935-11-07 1935-11-07 Improvements in or relating to electric discharge devices Expired GB464809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3081135A GB464809A (en) 1935-11-07 1935-11-07 Improvements in or relating to electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3081135A GB464809A (en) 1935-11-07 1935-11-07 Improvements in or relating to electric discharge devices

Publications (1)

Publication Number Publication Date
GB464809A true GB464809A (en) 1937-04-26

Family

ID=10313496

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3081135A Expired GB464809A (en) 1935-11-07 1935-11-07 Improvements in or relating to electric discharge devices

Country Status (1)

Country Link
GB (1) GB464809A (en)

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