GB374126A - Improvements in and relating to thermionic devices - Google Patents

Improvements in and relating to thermionic devices

Info

Publication number
GB374126A
GB374126A GB680731A GB680731A GB374126A GB 374126 A GB374126 A GB 374126A GB 680731 A GB680731 A GB 680731A GB 680731 A GB680731 A GB 680731A GB 374126 A GB374126 A GB 374126A
Authority
GB
United Kingdom
Prior art keywords
resistance
refractory
bands
class
shields
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
GB680731A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB680731A priority Critical patent/GB374126A/en
Publication of GB374126A publication Critical patent/GB374126A/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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/22—Heaters

Landscapes

  • Electric Stoves And Ranges (AREA)

Abstract

374,126. Thermionic cathodes. FREEDMAN, P., 70, Durley Road, London. March 5, 1931, No. 6807. [Class 39 (i).] In an equipotential cathode having a resistance mounted on or embedded in a refractory insulating body such as magnesia, alumina or porcelain, deleterious effects of electrolytic action within the refractory body upon its resistance are minimized by means of a refractory conducting element or shield arranged in the region of the maximum electrolytic effect, and of such dimensions as not to cool the insulating material to such an extent as to displace the region of maximum electrolysis. The shields may consist of bands, discs or rods in contact with the resistance and the refractory body. They may be placed at the ends of the resistance, or preferably, as shown, bands 12 are arranged at points of the refractory body 7 near the ends of the resistance 6, and are connected with the ends. The shield is arranged so as not to short-circuit the resistance. The resistance may be of tungsten, or tungsten carbide orsilicide. In another heater a crinkled wire is mounted on a flat insulating plate by means of hooks or pins, and the shields consist of discs embedded in the plate. The cathode may be used in valves or in metallic vapour lamps as described in Specification 329,627, (Class 39 (i), Electric lamps, Arc &c.]. Specification 367,825 also is referred to.
GB680731A 1931-03-05 1931-03-05 Improvements in and relating to thermionic devices Expired GB374126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB680731A GB374126A (en) 1931-03-05 1931-03-05 Improvements in and relating to thermionic devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB680731A GB374126A (en) 1931-03-05 1931-03-05 Improvements in and relating to thermionic devices

Publications (1)

Publication Number Publication Date
GB374126A true GB374126A (en) 1932-06-06

Family

ID=9821113

Family Applications (1)

Application Number Title Priority Date Filing Date
GB680731A Expired GB374126A (en) 1931-03-05 1931-03-05 Improvements in and relating to thermionic devices

Country Status (1)

Country Link
GB (1) GB374126A (en)

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