Millstone and glasses: what they have in common

1. Step 1. Millstone — is part of — Windmill. A windmill turns the millstones.
2. Step 2. Windmill — has part — Sail. A windmill’s sails are cloths on rotating arms.
3. Step 3. Sail — is part of — Sailing ship. Sails drive the ship.
4. Step 4. Sailing ship — has part — Sextant. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
5. Step 5. Sextant — has part — Lens. The sextant’s telescope.
6. Step 6. Lens — is part of — Glasses. Lenses.

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