GB507519A - Improvements in activated electrodes in discharge devices - Google Patents

Improvements in activated electrodes in discharge devices

Info

Publication number
GB507519A
GB507519A GB957138A GB957138A GB507519A GB 507519 A GB507519 A GB 507519A GB 957138 A GB957138 A GB 957138A GB 957138 A GB957138 A GB 957138A GB 507519 A GB507519 A GB 507519A
Authority
GB
United Kingdom
Prior art keywords
helices
diameter
electrodes
lead
tungsten wire
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
GB957138A
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 GB957138A priority Critical patent/GB507519A/en
Publication of GB507519A publication Critical patent/GB507519A/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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

507,519. Discharge lamps. GENERAL ELECTRIC CO., Ltd., and CLACK, B. N. March 29, 1938, No. 9571. [Class 39 (i)] In a sodium vapour discharge lamp the electrodes are formed from a tungsten wire of 1 mm. diameter wound upon a mandrel of À2 mm. diameter tungsten wire, the whole being made into two concentric helices 1, 2 of 3 and 4 turns and 5 mm. and 3 mm. diameter respectively ; the helices are coated with a suspension of barium and strontium carbonates. The electrode is mounted on lead-in wires secured to the free ends of the helices in a U-tube of 16 mm. bore and 430 mm. length, which is evacuated (during which process the lead-in wires carry a heating current) and then filled with sodium and a rare gas; the leads are then joined, and the electrodes heated solely by the discharge current. Specification 467,432 is referred to.
GB957138A 1938-03-29 1938-03-29 Improvements in activated electrodes in discharge devices Expired GB507519A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB957138A GB507519A (en) 1938-03-29 1938-03-29 Improvements in activated electrodes in discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB957138A GB507519A (en) 1938-03-29 1938-03-29 Improvements in activated electrodes in discharge devices

Publications (1)

Publication Number Publication Date
GB507519A true GB507519A (en) 1939-06-16

Family

ID=9874545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB957138A Expired GB507519A (en) 1938-03-29 1938-03-29 Improvements in activated electrodes in discharge devices

Country Status (1)

Country Link
GB (1) GB507519A (en)

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