Historedia
Episode 3 of 3

Practical Semaphore System Demonstrated, 1792

When
1792
Where
Paris–Lille line and national network
Part of
Demonstration of the Mechanical Telegraph by Claude Chappe

In 1792 Chappe demonstrated a practical semaphore system that eventually spanned all of France.

In 1792 Claude Chappe demonstrated a practical semaphore system that eventually spanned all of France. Credit for the first successful optical telegraph goes to Chappe and his brothers, who succeeded in covering France with a network of 556 stations stretching 4,800 kilometres (3,000 mi). In the summer of 1792 Claude was appointed Ingénieur-Télégraphiste and charged with establishing a line of stations between Paris and Lille, a distance of 230 kilometres (140 mi).

Sources

  1. Claude Chappe Wikipedia, revision of 2026-05-16
  2. Optical telegraph Wikipedia, revision of 2026-06-11

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.