Crown cap and telescope: what they have in common

1. Step 1. Crown cap — is part of — Glass bottle. A cap.
2. Step 2. Glass bottle — has part — Cork. A cork.
3. Step 3. Cork — is used in — Corkscrew. It pulls out the cork.
4. Step 4. Corkscrew — uses — Lever. Lever corkscrews.
5. Step 5. Lever — is used in — Optical telegraph. The arms were moved by a system of levers and rods.
6. Step 6. Optical telegraph — uses — Telescope. Signals were read through a telescope.

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