http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-392807-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d647e846645953f86e9ba89e7f5ead3d |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S315-02 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H01J61-067 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H01J61-92 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01J61-92 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01J61-067 |
| filingDate | 1932-09-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1933-05-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-392807-A |
| titleOfInvention | Improvements in and relating to electric discharge devices |
| abstract | 392,807. Discharge lamps. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Found, C. G. ; 1190, Phoenix Avenue, Schenectady, New York, U.S.A.) Sept. 29, 1932, No. 27066. Convention date, Sept. 30, 1931. [Class 39 (i).] A compound thermionic cathode, particularly for a lamp, consists of members arranged in heatinterchanging relation to one another, and means are provided for dividing the load current in a predetermined ratio between the members. As shown in Fig. 3, the cathode consists of an outer shell 13, provided with apertures 14, and enclosing a shell 18 having an internal heater 19 of tungsten supported on a core 20 of alumina or thoria. The inner surface of the shell 13 and the outer surface of the shell 18 are coated with barium oxide. The lamp contains neon, mercury vapour, a mixture of neon with argon or krypton, or a mixture of mercury and argon at a pressure of 1 to 10 mms. One end of the heater 19 is connected with the shell 18 and the other with a lead 49. The outer shell is connected with the lead 49, and through a winding 53 and a resistance 51 with the negative of the supply. The shell 13 is thus at a potential negative to that of the shell 18, and the division of current between the shells depends on the resistance of the heater 19. The positive of the supply is connected through a switch 56 and a resistance 57 with the shell 18. The switch 56 is connected by a link 58 with a lever 59 carrying the armature 65 of a winding 53 and a mercury switch 54, which is connected through a resonance 61 with the switch 56, and through a resistance 63, shunted by a thermal switch 62, with the winding 53. When the switch 56 is closed, current passes through the heater 19, and the concurrent closing of the switch 54 causes the thermal switch 62 to be closed after an interval by heat from the resistance 63, causing the winding 53 to be energized so as to attract the armature and open the switch 56. The de-energization of the winding 53 superposes an inductive kick on the supply voltage and starts the discharge. In the alternating current lamp shown in Fig. 1, the division of the current between the shells is determined by an adjustable resistance 26 connected between them. The starting circuit 31, 37 includes the winding 32, mercury switch 35, thermal switch 38, and heating resistance 39, and is energized from a transformer 28. When the thermal switch 38 closes, the winding attracts the armature 33 and rocks a lever 34 so as to open the switch 35 and a switch 36 in the cathode heating circuit ; or the switch 36 may be omitted, and the cathode heater energized during operation of the lamp. |
| priorityDate | 1931-09-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 29.