GB501854A - Improvements in high-pressure mercury-vapour electric discharge lamps - Google Patents
Improvements in high-pressure mercury-vapour electric discharge lampsInfo
- Publication number
- GB501854A GB501854A GB3114837A GB3114837A GB501854A GB 501854 A GB501854 A GB 501854A GB 3114837 A GB3114837 A GB 3114837A GB 3114837 A GB3114837 A GB 3114837A GB 501854 A GB501854 A GB 501854A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- lamp
- pressure mercury
- discharge lamps
- terminations
- 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
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
501,854. Discharge lamps. GENERAL ELECTRIC CO., Ltd., and FRANCIS, V. J. Nov. 12, 1937, No. 31148. [Class 39 (i)] In a high-pressure mercury-vapour discharge lamp wherein L the distance between the terminations of the discharge path in full operation is less than the mean distance of either of those terminatioms from the envelope, (i) the ratio of power consumed (W) in full operation to L exceeds 1,000 watts/cm.; (ii) the refractory electrodes of material such as tungsten become incandescent; and (iii) the red ratio of total light emitted from the lamp by a filter known as Wratten No. 25 is not less than 6. If V is voltage between the terminations then V/L is 250 and 50 volts per cm. corresponding to running pressures of 50 and 10 atmospheres. Forced cooling may be applied to the lamp. Sizes of lengths of discharges and electrodes corresponding to consumptions of 250, 500 and 1,000 watts are given. In one form the running electrodes 2, 2<1> are 1À5 mm. apart and have starting electrodes 3, 3<1> behind them. The sizes of the quartz envelope are given and the red ratio is 9 with initial efficiency of 42 lumens /watt. Specifications 482,070 and 485,489 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3114837A GB501854A (en) | 1937-11-12 | 1937-11-12 | Improvements in high-pressure mercury-vapour electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3114837A GB501854A (en) | 1937-11-12 | 1937-11-12 | Improvements in high-pressure mercury-vapour electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB501854A true GB501854A (en) | 1939-03-07 |
Family
ID=10318725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3114837A Expired GB501854A (en) | 1937-11-12 | 1937-11-12 | Improvements in high-pressure mercury-vapour electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB501854A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2545884A (en) * | 1946-01-18 | 1951-03-20 | Gen Electric | High-pressure mercury vapor electric discharge lamp |
-
1937
- 1937-11-12 GB GB3114837A patent/GB501854A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2545884A (en) * | 1946-01-18 | 1951-03-20 | Gen Electric | High-pressure mercury vapor electric discharge lamp |
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