Thermodynamics et railway semaphore : ce qu'ils ont en commun
- Étape 1. Thermodynamics — a été inspiré par — Watt steam engine. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
- Étape 2. Watt steam engine — utilise — Charbon. Steam engines were fired with coal.
- Étape 3. Charbon — est un matériau pour — Coal gas. The gas was made by the dry distillation of coal.
- Étape 4. Coal gas — est utilisé dans — Traffic light. A gas lamp lit the signal.
- Étape 5. Traffic light — a évolué de — Railway semaphore. The first traffic light was a railway-style semaphore.