GB359389A - - Google Patents
Info
- Publication number
- GB359389A GB359389A GB38303/30A GB3830330A GB359389A GB 359389 A GB359389 A GB 359389A GB 38303/30 A GB38303/30 A GB 38303/30A GB 3830330 A GB3830330 A GB 3830330A GB 359389 A GB359389 A GB 359389A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speed
- metres per
- tungsten wire
- drawn
- contacts
- 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
- H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
- H01K3/02—Manufacture of incandescent bodies
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
In the manufacture of tungsten wire consisting of long crystals, drawn tungsten wire is passed continuously through a single heating zone of a temperature exceeding 2000 DEG C. in order to effect crystal transformation at a speed that is several times the speed of crystal growth, i.e. at a speed greater than 10 metres per hour. For ordinary filament wires, the speed is usually 100-300 metres per hour. In an example a tungsten wire of 0,17 mm. diameter is drawn at a speed of 2 metres per minute over two tungsten contacts which serve to supply the heating current and which are arranged at a distance of 30 cm. apart in an atmosphere consisting of three parts of nitrogen and one of hydrogen. The part of the filament between the contacts is heated to 2400-2600 DEG C. Specifications 16620/14, 155,851, 174,714, and 181,703, [all in Class 39 (ii), Electric Lamps, Incandescent], are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE359389T | 1930-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB359389A true GB359389A (en) | 1931-10-29 |
Family
ID=31895378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38303/30A Expired GB359389A (en) | 1930-01-30 | 1930-12-19 |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB359389A (en) |
| NL (1) | NL31983C (en) |
-
0
- NL NL31983D patent/NL31983C/xx active
-
1930
- 1930-12-19 GB GB38303/30A patent/GB359389A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL31983C (en) |
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