Magnetic minesweeping cable and rolling mill: what they have in common

1. Step 1. Magnetic minesweeping cable — is part of — Minesweeper. It simulates the ship’s field.
2. Step 2. Minesweeper — uses — Landmine. Against sea mines.
3. Step 3. Landmine — uses — Gunpowder. Chinese mines of the 13th century were filled with gunpowder.
4. Step 4. Gunpowder — is used in — Gunpowder mill. Production.
5. Step 5. Gunpowder mill — has part — Water wheel. The drive.
6. Step 6. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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