Well and tank: what they have in common

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

Open Evothings