GB479258A - Improvements in and relating to light projecting devices - Google Patents
Improvements in and relating to light projecting devicesInfo
- Publication number
- GB479258A GB479258A GB1367337A GB1367337A GB479258A GB 479258 A GB479258 A GB 479258A GB 1367337 A GB1367337 A GB 1367337A GB 1367337 A GB1367337 A GB 1367337A GB 479258 A GB479258 A GB 479258A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relating
- light projecting
- projecting devices
- vessel
- filament
- 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
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/28—Envelopes; Vessels
Abstract
A parabolic glass body forming part of an electric incandescent lamp is provided with an internal coating of aluminium by vaporizing U-shaped loops of aluminium wire which are hung upon a heating-filament mounted on a plate which is used as a temporary closure for the open end of the vessel. The vessel is evacuated before the filament is heated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1367337A GB479258A (en) | 1937-05-14 | 1937-05-14 | Improvements in and relating to light projecting devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1367337A GB479258A (en) | 1937-05-14 | 1937-05-14 | Improvements in and relating to light projecting devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB479258A true GB479258A (en) | 1938-02-02 |
Family
ID=10027334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1367337A Expired GB479258A (en) | 1937-05-14 | 1937-05-14 | Improvements in and relating to light projecting devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB479258A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4509107A (en) * | 1983-10-27 | 1985-04-02 | General Electric Company | Sealed beam lamp unit and method for an improved sealed exhaust hole |
US4514275A (en) * | 1981-02-12 | 1985-04-30 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Apparatus for physical vapor deposition |
-
1937
- 1937-05-14 GB GB1367337A patent/GB479258A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4514275A (en) * | 1981-02-12 | 1985-04-30 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Apparatus for physical vapor deposition |
US4509107A (en) * | 1983-10-27 | 1985-04-02 | General Electric Company | Sealed beam lamp unit and method for an improved sealed exhaust hole |
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