Watt steam engine und gas lamp: was sie gemeinsam haben

1. Schritt 1. Watt steam engine — nutzt — Kohle. Steam engines were fired with coal.
2. Schritt 2. Kohle — ist Material für — Coal gas. The gas was made by the dry distillation of coal.
3. Schritt 3. Coal gas — wird verwendet in — Gas lamp. Coal gas.

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