Episode 1 of 2
Semaphore Demonstration
- When
- 1792
- Where
- Demonstration site
Claude Chappe demonstrated a practical semaphore system in 1792, using pivoted indicator arms to convey information visually over distance.
The demonstration involved operators moving arms to specific positions to spell out text messages in semaphore code. This apparatus was a terrestrial telegraph that conveyed information based on the direction the indicators pointed, marking a significant development in visual signaling.
Sources
- Claude Chappe Wikipedia, revision of 2026-05-16
- Semaphore Wikipedia, revision of 2026-09-15
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.