Thermodynamics e railway semaphore: o que têm em comum

1. Passo 1. Thermodynamics — foi inspirado por — Watt steam engine. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
2. Passo 2. Watt steam engine — utiliza — Carvão mineral. Steam engines were fired with coal.
3. Passo 3. Carvão mineral — é material para — Coal gas. The gas was made by the dry distillation of coal.
4. Passo 4. Coal gas — é utilizado em — Traffic light. A gas lamp lit the signal.
5. Passo 5. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.

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