Arm and leg armor and shaduf: what they have in common

1. Step 1. Arm and leg armor — is part of — Plate armour. Protection for the limbs.
2. Step 2. Plate armour — has part — Rivet. Movable plates on rivets.
3. Step 3. Rivet — is part of — Eiffel Tower. 2.5 million rivets.
4. Step 4. Eiffel Tower — has part — Elevator. Lifts.
5. Step 5. Elevator — uses — Counterweight. A counterweight balances the car.
6. Step 6. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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