Mortar baseplate and rolling mill: what they have in common

1. Step 1. Mortar baseplate — is part of — Mortar (weapon). It transfers the recoil to the ground.
2. Step 2. Mortar (weapon) — uses — Gunpowder. A propellant charge launches the bomb.
3. Step 3. Gunpowder — is used in — Gunpowder mill. Production.
4. Step 4. Gunpowder mill — has part — Water wheel. The drive.
5. Step 5. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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