GB475183A - Improvements in or relating to electric discharge tubes - Google Patents
Improvements in or relating to electric discharge tubesInfo
- Publication number
- GB475183A GB475183A GB4267/36A GB426736A GB475183A GB 475183 A GB475183 A GB 475183A GB 4267/36 A GB4267/36 A GB 4267/36A GB 426736 A GB426736 A GB 426736A GB 475183 A GB475183 A GB 475183A
- Authority
- GB
- United Kingdom
- Prior art keywords
- molybdenum
- tungsten
- electric discharge
- micron
- employed
- 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
- 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
- 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
- Electrostatic Separation (AREA)
Abstract
To improve thermal radiation and reduce secondary emission one or more of the components of an electric discharge tube, e.g. the electrodes, electrode supports or wall of the envelope, have a dull black surface consisting of particles of a metal, the melting point of which is higher than 1200 DEG K., the dimensions of the component particles being of the order of 0,1 micron or less, preferably 0,01 micron. Metals such as tungsten or molybdenum, melting above 2000 DEG K., are preferably employed. Nickel and iron may be deposited by decomposition of their oxalates, and platinum by electrolysis. Tungsten and molybdenum may be vaporized in a gaseous atmosphere, such as argon, or in water vapour at 1 mm. pressure or more, preferably 20 mms. The oxides, halides or oxyhalides of tungsten or molybdenum may be reduced by hydrogen at low temperature. Cathodic disintegration may be employed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL475183X | 1935-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB475183A true GB475183A (en) | 1937-11-12 |
Family
ID=19786513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4267/36A Expired GB475183A (en) | 1935-04-18 | 1936-02-12 | Improvements in or relating to electric discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB475183A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2576129A (en) * | 1944-12-20 | 1951-11-27 | Levin Irvin | Nonemitting electron tube grid |
| GB2179488A (en) * | 1985-08-22 | 1987-03-04 | English Electric Valve Co Ltd | Laser apparatus |
-
1936
- 1936-02-12 GB GB4267/36A patent/GB475183A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2576129A (en) * | 1944-12-20 | 1951-11-27 | Levin Irvin | Nonemitting electron tube grid |
| GB2179488A (en) * | 1985-08-22 | 1987-03-04 | English Electric Valve Co Ltd | Laser apparatus |
| US4761792A (en) * | 1985-08-22 | 1988-08-02 | English Electric Valve Company | Laser apparatus |
| GB2179488B (en) * | 1985-08-22 | 1989-08-23 | English Electric Valve Co Ltd | Laser apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2282098A (en) | Carbon electrode | |
| GB475183A (en) | Improvements in or relating to electric discharge tubes | |
| GB483708A (en) | Improvements in or relating to electron discharge devices | |
| US2172968A (en) | Electric discharge tube | |
| GB230183A (en) | Improvements in or relating to x-ray tubes | |
| Vernon et al. | Electrolytic Polishing of Zinc | |
| GB484143A (en) | Improvements in or relating to artificially cooled high-pressure mercury-vapour discharge tubes | |
| GB271116A (en) | Improvements in or relating to photo-electric cells | |
| US1925075A (en) | Electrode elements of vacuum tubes | |
| GB616808A (en) | Improvements in or relating to electric high-pressure metal-vapour discharge tubes | |
| GB352756A (en) | Improvements in and relating to gaseous electric discharge devices | |
| GB329854A (en) | ||
| GB491176A (en) | Improvements in high-pressure metal-vapour electric discharge devices | |
| GB315094A (en) | Improvements in and relating to electric arc devices | |
| GB424322A (en) | Improvements in or relating to electric discharge tubes | |
| GB267142A (en) | Improvements in thermionic electrodes | |
| GB455548A (en) | Improvements in and relating to metal vapour rectifiers | |
| GB418027A (en) | Improvements in and relating to gaseous electric discharge devices | |
| GB360419A (en) | Improvements in and relating to electric discharge tubes | |
| DE437549C (en) | Electric discharge tubes that have a glow cathode and one or more cold electrodes and a vaporizable electropositive substance | |
| GB470234A (en) | Improvements in carbon-coated electrodes or the like in electric discharge tubes | |
| GB677856A (en) | Improvements in and relating to cathodes for ionization detection devices | |
| GB461539A (en) | Improvements relating to the electrode mounting and envelopes of electron discharge tubes | |
| GB459539A (en) | Improvements in cathodes for thermionic tubes | |
| GB995609A (en) | Improvements in or relating to the vaporization of metals |