Iron-capped battering log and autoclave: what they have in common

1. Step 1. Iron-capped battering log — is part of — Battering ram. A heavy log with a metal-clad head.
2. Step 2. Battering ram — works like — Pile driver. A battering ram and a pile driver both strike with a heavy weight: one breaks gates, the other drives piles.
3. Step 3. Pile driver — uses — Pile. It drives piles.
4. Step 4. Pile — is part of — Foundation. A pile foundation.
5. Step 5. Foundation — uses — Pressure. A wide base reduces the pressure on the ground.
6. Step 6. Pressure — is used in — Autoclave. Steam under pressure.

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