Pliers and sonar: what they have in common

1. Step 1. Pliers — works like — Blacksmith’s tongs. Blacksmith's tongs and pliers work the same way — two levers on a hinge.
2. Step 2. Blacksmith’s tongs — is used in — Forge. The smith holds the workpiece with tongs.
3. Step 3. Forge — has part — Bellows. Bellows fan the fire of the forge.
4. Step 4. Bellows — is made of — Leather. Bellows are a leather bag.
5. Step 5. Leather — is material for — Submarine. It was covered with leather.
6. Step 6. Submarine — has part — Sonar. Underwater acoustics.

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