Wooden bucket and tank: what they have in common

1. Step 1. Wooden bucket — is part of — Well. It scoops up water.
2. Step 2. Well — uses — Windlass. The bucket was raised with a windlass.
3. Step 3. Windlass — uses — Wheel. A windlass is a wheel and axle used as a simple machine.
4. Step 4. Wheel — is part of — Siege tower. On wheels.
5. Step 5. Siege tower — works like — Tank. An armoured mobile shelter and platform for attacking fortifications.

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