Chimney and vacuum pump: what they have in common

1. Step 1. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.
2. Step 2. Steam locomotive — has part — Watt steam engine. A steam locomotive is driven by a steam engine.
3. Step 3. Watt steam engine — evolved from — Piston pump. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.
4. Step 4. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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