GB267142A - Improvements in thermionic electrodes - Google Patents

Improvements in thermionic electrodes

Info

Publication number
GB267142A
GB267142A GB6117/27A GB611727A GB267142A GB 267142 A GB267142 A GB 267142A GB 6117/27 A GB6117/27 A GB 6117/27A GB 611727 A GB611727 A GB 611727A GB 267142 A GB267142 A GB 267142A
Authority
GB
United Kingdom
Prior art keywords
filament
mixture
cathode
container
tube
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
GB6117/27A
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 GB267142A publication Critical patent/GB267142A/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
    • H01J1/14—Solid thermionic cathodes characterised by the material

Landscapes

  • Discharge Lamp (AREA)

Abstract

267,142. British Thomson-Houston Co., Ltd., (Assignees of Mackay, G. M. T.). March 6, 1926, [Convention date]. Vacuum tubes.-A thermionic electrode for use as a cathode or anode comprises a metal tube or container enclosing a substance which has a materially lower electron affinity than the container, and is diffusible through the wall of the container under the action of heat so as to'form a film emitting electrons or positive ions. The tube may consist of nickel, iron .or similar metal having a high work function, and the active material may consist of caesium, rubidium, barium, calcium, thorium, or cerium, or a mixture of these metals, or a mixture of compounds of the metals with a reducing agent, for instance, a mixture of caesium chloride and powdered magnesium or calcium. The tube containing the material is closed by a screw and is swaged and drawn to a small diameter. The filament thus formed mav be used as the cathode of a two- or three-electrode valve, or, as shown, a short length of filament 14 for generating positive ions may be connected with a contact device 16, the valve comprising also a filament cathode 11, a grid 13, and an anode 12. Specifications 208,728 and 208,729 are referred to.
GB6117/27A 1926-03-06 1927-03-04 Improvements in thermionic electrodes Expired GB267142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US267142XA 1926-03-06 1926-03-06

Publications (1)

Publication Number Publication Date
GB267142A true GB267142A (en) 1927-03-21

Family

ID=21833403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6117/27A Expired GB267142A (en) 1926-03-06 1927-03-04 Improvements in thermionic electrodes

Country Status (2)

Country Link
DE (1) DE521049C (en)
GB (1) GB267142A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1073637B (en) * 1960-01-21 Philips Patentverwaltung G.M.B.H., Hamburg Grid controlled electron tube
DE949361C (en) * 1951-04-18 1956-09-20 Siemens Ag Cathode for electrical discharge vessels
DE966243C (en) * 1952-03-24 1957-07-18 Siemens Ag Cathode for electrical discharge vessels in which thorium is used as an emission substance

Also Published As

Publication number Publication date
DE521049C (en) 1931-03-23

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