Thermodynamics und railway semaphore: was sie gemeinsam haben

1. Schritt 1. Thermodynamics — wurde inspiriert von — Watt steam engine. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
2. Schritt 2. Watt steam engine — nutzt — Kohle. Steam engines were fired with coal.
3. Schritt 3. Kohle — ist Material für — Coal gas. The gas was made by the dry distillation of coal.
4. Schritt 4. Coal gas — wird verwendet in — Traffic light. A gas lamp lit the signal.
5. Schritt 5. Traffic light — entwickelte sich aus — Railway semaphore. The first traffic light was a railway-style semaphore.

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