Gristmill and cannon: what they have in common

1. Step 1. Gristmill — has part — Millstone. Grain is ground by millstones.
2. Step 2. Millstone — is part of — Windmill. A windmill turns the millstones.
3. Step 3. Windmill — has part — Sail. A windmill’s sails are cloths on rotating arms.
4. Step 4. Sail — is part of — Clipper. A huge area of sail.
5. Step 5. Clipper — evolved from — Galleon. The sailing fleet developed towards speed.
6. Step 6. Galleon — has part — Cannon. Cannons on the decks.

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