Hollow bronze sphere and steam locomotive: what they have in common

1. Step 1. Hollow bronze sphere — is part of — Heron’s aeolipile. It rotates on tubular axles.
2. Step 2. Heron’s aeolipile — uses — Combustion. A fire boils the water in the cauldron.
3. Step 3. Combustion — is used in — Heating stove. Burning wood.
4. Step 4. Heating stove — has part — Chimney. A chimney.
5. Step 5. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.

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