Ctesibius-Style Regulated Water Clocks
Regulated Hellenistic clepsydrae that used controlled water flow, floats, and calibrated displays to turn simple interval timers into more continuous clocks.
Core metadata
- ID: water_clocks_advanced_clepsydra
- Era: Classical
- First known date: -300 (century)
- Region: Ptolemaic Alexandria
- Review status: source_checked
- Maturity: N/A
Prerequisites
Dependents
- Water-Clock Feedback and Time-Reporting Mechanisms (mechanical_clocks_water_escapements)
- Mechanical Clocks (mechanical_clocks)
Fields
Field lanes
- Mechanical Engineering: Foundations & Measurement
Node sources
- Water Clocks (MacTutor History of Mathematics Archive, 2026, textbook) • Supports: node, maturity, edge
- Historical development of water-powered mechanical clocks (Mechanical Sciences, 2021, review) • Supports: node, maturity, edge
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 3
- Average edge confidence: 79%
- Prerequisite sources: 3
- review: 1
- textbook: 2
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Water Clock Timekeeping (water_clock_timekeeping) | historical_predecessor | 82% | textbook | Ctesibius-style regulated clocks extended simpler Athenian and Egyptian clepsydra timing practices by adding floats, controlled apertures, and calibrated displays. |
|
| Hydraulics (hydraulics) | required | 84% | review | The scoped technology measures time by regulating water flow; feedback and flow control are the core mechanism that distinguishes it from a simple sinking or draining bowl. |
|
| Mathematics (mathematics) | enabling | 70% | textbook | Seasonal hour scales and calibrated columns required quantitative layout and periodic adjustment, but mathematics is an enabling design practice rather than the operating mechanism. |
|
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