GB374126A - Improvements in and relating to thermionic devices - Google Patents
Improvements in and relating to thermionic devicesInfo
- 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
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.
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) |
-
1931
- 1931-03-05 GB GB680731A patent/GB374126A/en not_active Expired
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