GB485410A - Improvements in cathodes for electric discharge devices - Google Patents

Improvements in cathodes for electric discharge devices

Info

Publication number
GB485410A
GB485410A GB781737A GB781737A GB485410A GB 485410 A GB485410 A GB 485410A GB 781737 A GB781737 A GB 781737A GB 781737 A GB781737 A GB 781737A GB 485410 A GB485410 A GB 485410A
Authority
GB
United Kingdom
Prior art keywords
cup
hour
cathodes
rare gas
electric discharge
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
GB781737A
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 GB781737A priority Critical patent/GB485410A/en
Publication of GB485410A publication Critical patent/GB485410A/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
    • H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material

Landscapes

  • Apparatus For Radiation Diagnosis (AREA)

Abstract

485,410. Thermionic cathodes. GENERAL ELECTRIC CO., Ltd., and RANDALL, J. T. March 17, 1937, No. 7817. [Class 39 (i)] The cathode of dis charge devices of the type filled with rare gas or a mixture of a rare gas and metal vapour and adapted to operate with a discharge current of not less than 150 m.A., consists of a metal cup 1, preferably nickel or iron, containing an akaline earth silicate material 2 of the kind described in Specification 384,067 or 411,266. The material is ground, mixed with castor oil to form a thick paste and placed in the cup, being thereafter heated in stages of 700-1000‹ C. for half an hour, 1000-1300‹ C. for 10 minutes and finally to 1300‹ C. for half an hour. The material is formed with a concave surface as shown and has a central hole 5 to facilitate de-gassing. Preferably, a sheet of gauze 3 is placed in the bottom of the cup to assist adhesion.
GB781737A 1937-03-17 1937-03-17 Improvements in cathodes for electric discharge devices Expired GB485410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB781737A GB485410A (en) 1937-03-17 1937-03-17 Improvements in cathodes for electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB781737A GB485410A (en) 1937-03-17 1937-03-17 Improvements in cathodes for electric discharge devices

Publications (1)

Publication Number Publication Date
GB485410A true GB485410A (en) 1938-05-19

Family

ID=9840328

Family Applications (1)

Application Number Title Priority Date Filing Date
GB781737A Expired GB485410A (en) 1937-03-17 1937-03-17 Improvements in cathodes for electric discharge devices

Country Status (1)

Country Link
GB (1) GB485410A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973193C (en) * 1951-11-29 1959-12-17 Philips Nv Cathode for an electrical discharge tube, which is provided with a supply of alkaline earth compounds inside

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973193C (en) * 1951-11-29 1959-12-17 Philips Nv Cathode for an electrical discharge tube, which is provided with a supply of alkaline earth compounds inside

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