Tungsten Filament Production
Coolidge-style production of ductile drawn tungsten wire for incandescent lamp filaments and related vacuum devices.
Core metadata
- ID: tungsten_filament_production
- Era: Modern
- First known date: 1909 (exact)
- Region: General Electric Research Laboratory, Schenectady, New York
- Review status: source_checked
- Maturity: established
Prerequisites
- Advanced Metallurgy (Medieval) (advanced_metallurgy_medieval)
- Electricity (electricity)
- Mining (mining)
- Powder Metallurgy (powder_metallurgy)
Dependents
- None.
Fields
Field lanes
- Materials Science & Manufacturing: Metals & Alloys
Node sources
- Lighting A Revolution: William D. Coolidge (Smithsonian National Museum of American History, 2026, museum) • Supports: node, maturity
- Tungsten and method of making the same for use as filaments of incandescent electric lamps and for other purposes (Google Patents / United States Patent Office, 1913, primary_paper) • Supports: node, maturity
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 4
- Average edge confidence: 72%
- Prerequisite sources: 4
- expert_inference: 3
- review: 1
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Advanced Metallurgy (Medieval) (advanced_metallurgy_medieval) | enabling | 68% | expert_inference | Advanced Metallurgy (Medieval) provides a capability that enables this technology without being the only possible path. |
|
| Mining (mining) | enabling | 68% | expert_inference | Mining provides a capability that enables this technology without being the only possible path. |
|
| Electricity (electricity) | enabling | 68% | expert_inference | Electricity provides a capability that enables this technology without being the only possible path. |
|
| Powder Metallurgy (powder_metallurgy) | required | 84% | review | Coolidge's ductile tungsten process began from sintered tungsten and used hot swaging and drawing to make bendable wire, making powder metallurgy directly relevant to the scoped production method. |
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