Pressure fuze and piston pump: what they have in common

1. Step 1. Pressure fuze — is part of — Landmine. Triggered by pressure.
2. Step 2. Landmine — uses — Gunpowder. Chinese mines of the 13th century were filled with gunpowder.
3. Step 3. Gunpowder — is used in — Cannon. A gunpowder charge.
4. Step 4. Cannon — is part of — Ironclad. Artillery.
5. Step 5. Ironclad — has part — Watt steam engine. Steam engines.
6. Step 6. Watt steam engine — evolved from — Piston pump. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.

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