Anchor flukes and boyle’s air pump: what they have in common

1. Step 1. Anchor flukes — is part of — Anchor. They dig into the ground.
2. Step 2. Anchor — is made of — Stone. The oldest anchors were stones with a hole.
3. Step 3. Stone — is material for — Canal lock. The walls of the chamber are stone.
4. Step 4. Canal lock — has part — Valve. Sluice gates.
5. Step 5. Valve — is part of — Boyle’s air pump. Valves.

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