GB421705A - Improvements in or relating to luminous electric discharge tubes - Google Patents
Improvements in or relating to luminous electric discharge tubesInfo
- Publication number
- GB421705A GB421705A GB9477/34A GB947734A GB421705A GB 421705 A GB421705 A GB 421705A GB 9477/34 A GB9477/34 A GB 9477/34A GB 947734 A GB947734 A GB 947734A GB 421705 A GB421705 A GB 421705A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- parts
- rods
- cathode
- anode
- 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
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42F—SHEETS TEMPORARILY ATTACHED TOGETHER; FILING APPLIANCES; FILE CARDS; INDEXING
- B42F13/00—Filing appliances with means for engaging perforations or slots
- B42F13/16—Filing appliances with means for engaging perforations or slots with claws or rings
- B42F13/20—Filing appliances with means for engaging perforations or slots with claws or rings pivotable about an axis or axes parallel to binding edges
- B42F13/28—Filing appliances with means for engaging perforations or slots with claws or rings pivotable about an axis or axes parallel to binding edges in two staggered sections
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
421,705. Discharge lamps. WESTING- HOUSE LAMP CO., Bloomfield, New Jersey, U.S.A.-(Assignees of Marden, J. W. ; 19, Laurel Avenue, East Orange, New Jersey, U.S.A.) March 26, 1934, No. 9477. Convention date, April 29, 1933. [Class 39 (i)] A gas- or vapourfilled discharge lamp comprises a thermionic cathode and two anodes, each of which is subdivided into two or more parts, the parts of each anode being so arranged that the discharge with each half-cycle of alternating current is divided into two or more paths. A lamp 1, Fig. 1, is surrounded by a double walled envelope 18, the space between the walls of which is exhausted, and comprises a cathode 8 and two pairs of concentric anode parts 13-16. The anode parts 13, 14 and the parts 15, 16 respectively are connected together by, and mounted on, rods 11, 12 which are connected to the leading-in wires through rods 9, 10. The connecting wires are covered with sleeves of alundum, magnesia or glass. Starting electrodes may be formed by bared parts of the wire or by the rods 9, 10. An insulating member 17 joins the wires 11, 12 together, and the air space between the lamp and the envelope is sealed by the packing 19. The lamp is connected up as shown, the cathode .being energized through a winding 24 and connected to the centre tapping of the winding 27 through a choke 30 or an auto transformer. A nickel sleeve 31 reduces the thermal radiation to the press. The filling consists of a vapour, e.g. sodium, potassium, caesium, or rubidium and a rare gas such as argon or neon at a pressure of 1-4 mms. The cathode may consist of a six mil nickel wire wound on a sixteen mil tungsten wire, which is coiled into a helix having an internal diameter of 3 mms., and the ends of which form connecting terminals. It may be sprayed with a mixture of carbonates in a binder of nitrocellulose amyl acetate. Alternatively, it may consist of a tube provided with an internal heater. In a modification, anode parts 17, 18, Fig. 4, and 19, 20, are mounted respectively on leads 21, 25. Condensation of vapour in the cool portion 11 is prevented by a metal partition 29 which is sealed therein by a cement of sodium silicate and Kaolin, and is provided with a tube 31 to enable both portions of the lamp to be evacuated simultaneously through the exhaust tube 13. The lamp is connected up as shown, a smoothing choke being connected between the centre tappings of the winding 41 and of the heater winding 35. The anode parts may be constructed of bands or rods, which may be corrugated, and may have any of the forms shown in Figs. 5-7. To improve the distribution of the discharge, the electrodes 18, 20, may be connected respectively to the wires 25, 21, by means of rods and insulations. In a further modification, a spherical bulb 55, Fig. 12, comprises a number of spherical anode parts mounted through rods 63 on the head 58 of a pedestal 57. The cathode consists of a helix 59 encircling the head. Dimensions determining the size and the position of the electrodes are given in the Specification. The lamp is baked and evacuated, the carbonates or azides on the cathode being converted into oxides. The filling may be introduced through the glass container by means of electrolysis or by enclosing within the lamp a bottle containing the vapour source. After sealing, the lamp is seasoned by operating it at a current value which is greater than its rating.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US668506A US2084772A (en) | 1933-04-29 | 1933-04-29 | Sodium vapor lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
GB421705A true GB421705A (en) | 1934-12-28 |
Family
ID=24682569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9477/34A Expired GB421705A (en) | 1933-04-29 | 1934-03-26 | Improvements in or relating to luminous electric discharge tubes |
Country Status (5)
Country | Link |
---|---|
US (1) | US2084772A (en) |
BE (1) | BE421705A (en) |
FR (1) | FR771823A (en) |
GB (1) | GB421705A (en) |
NL (1) | NL38561C (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2687471A (en) * | 1948-05-01 | 1954-08-24 | Western Union Telegraph Co | Concentrated arc discharge device |
US4691169A (en) * | 1979-03-15 | 1987-09-01 | Baum Robert A | Electrode assembly especially adapted to utilizing a magnetic field for measuring electric conductivity of treated non-polar liquids |
EP0440300B1 (en) * | 1990-02-02 | 1995-04-26 | Koninklijke Philips Electronics N.V. | Electrodeless low-pressure discharge lamp |
DE29924000U1 (en) * | 1999-09-28 | 2002-01-03 | Pharmaserv Marburg Gmbh & Co K | conductivity sensor |
-
0
- BE BE421705D patent/BE421705A/xx unknown
- NL NL38561D patent/NL38561C/xx active
-
1933
- 1933-04-29 US US668506A patent/US2084772A/en not_active Expired - Lifetime
-
1934
- 1934-03-26 GB GB9477/34A patent/GB421705A/en not_active Expired
- 1934-04-13 FR FR771823D patent/FR771823A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE421705A (en) | |
US2084772A (en) | 1937-06-22 |
FR771823A (en) | 1934-10-18 |
NL38561C (en) |
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