GB311851A - Improvements in vacuum electric tube devices - Google Patents

Improvements in vacuum electric tube devices

Info

Publication number
GB311851A
GB311851A GB626428A GB626428A GB311851A GB 311851 A GB311851 A GB 311851A GB 626428 A GB626428 A GB 626428A GB 626428 A GB626428 A GB 626428A GB 311851 A GB311851 A GB 311851A
Authority
GB
United Kingdom
Prior art keywords
carbon
cellulose
grid
helix
electrode
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
GB626428A
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB626428A priority Critical patent/GB311851A/en
Publication of GB311851A publication Critical patent/GB311851A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/30—Non-electron-emitting electrodes; Screens characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/002—Chemical composition and manufacture chemical
    • H01J2893/0021—Chemical composition and manufacture chemical carbon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

311,851. Robinson, E. Y., and Associated Electrical Industries, Ltd. Feb. 28, 1928. Vacuum tubes.-In order to prevent the secondary emission of electrons, an electrode, other than a thermionic cathode, is formed of carbon alone or of carbon reinforced with metal; a grid may consist of solid carbon and a grid or anode of carbonized cellulose material. In one method of preparation, a cellulose base is converted to carbon by heating in a vacuum or in an inert or reducing atmosphere, the electrode being shaped while in the cellulose condition; or the electrode may be formed of metal sheet or gauze coated with a suspension, paste, or solution of cellulose such as a solution of cotton in zinc chloride, or cellulose acetate solution, and heated in an inert or reducing gas or in a vacuum to carbonize the coating. Materials suggested as suitable for carbonizing are paper, Bristol board, cloth, papier mÔchÚ, wood or paper pulp, and muslin. A grid may be formed by lashing the turns of a carbon helix to a metal support which may be grooved as described in Specification 231,225; or the helix may be secured to a straight or V- shaped support by one or more clips. The grid shown consists of a helix 7 mounted on grooved supports 8 spaced by transverse wires 11. Metal strips 13 may be welded to the outer sides of the supports. An anode may be formed by two dished plates prepared as described above and secured together by rivets. They may be fastened to supports by rivets or clips; or a tubular anode may be clipped to a support. Specifications 24850/04, 13518/08. 238,218 and 271,466 also are referred to.
GB626428A 1928-02-28 1928-02-28 Improvements in vacuum electric tube devices Expired GB311851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB626428A GB311851A (en) 1928-02-28 1928-02-28 Improvements in vacuum electric tube devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB626428A GB311851A (en) 1928-02-28 1928-02-28 Improvements in vacuum electric tube devices

Publications (1)

Publication Number Publication Date
GB311851A true GB311851A (en) 1929-05-23

Family

ID=9811352

Family Applications (1)

Application Number Title Priority Date Filing Date
GB626428A Expired GB311851A (en) 1928-02-28 1928-02-28 Improvements in vacuum electric tube devices

Country Status (1)

Country Link
GB (1) GB311851A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744014C (en) * 1936-08-25 1944-01-07 Aeg Process for the production of structural parts made of carbon or graphite for electrical discharge vessels, in particular short-wave tubes
US2513387A (en) * 1947-08-26 1950-07-04 Standard Telephones Cables Ltd Grid electrode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744014C (en) * 1936-08-25 1944-01-07 Aeg Process for the production of structural parts made of carbon or graphite for electrical discharge vessels, in particular short-wave tubes
US2513387A (en) * 1947-08-26 1950-07-04 Standard Telephones Cables Ltd Grid electrode

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