Telephone
A telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
Core metadata
- ID: telephone
- Era: Industrial
- First known date: 1876 (exact)
- Region: United States
- Review status: source_checked
- Maturity: established
Prerequisites
- Electricity (electricity)
- Early Electromagnetism (electromagnetism_early_discoveries)
- Scientific Method (scientific_method)
- Telegraph (telegraph)
Dependents
- Telecommunications (telecommunications)
- Telephone Exchange (telephone_exchange)
- Telephone Switchboards (telephone_switchboards)
- Voice over IP (voice_over_ip)
Fields
Field lanes
- Telecommunications & Networking: Foundations & Switching
Node sources
- Alexander Graham Bell and the Telephone (Library of Congress, 2026, official_agency) • Supports: node, maturity
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 4
- Average edge confidence: 70%
- Prerequisite sources: 4
- expert_inference: 4
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Electricity (electricity) | enabling | 68% | expert_inference | Electricity provides a capability that enables this technology without being the only possible path. |
|
| Telegraph (telegraph) | enabling | 68% | expert_inference | Telegraph provides a capability that enables this technology without being the only possible path. |
|
| Scientific Method (scientific_method) | enabling | 68% | expert_inference | Scientific Method provides a capability that enables this technology without being the only possible path. |
|
| Early Electromagnetism (electromagnetism_early_discoveries) | historical_predecessor | 75% | expert_inference | Early Electromagnetism is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
This page is generated from canonical era JSON and is indexable by URL.