Ratchet and telescope: what they have in common

1. Step 1. Ratchet — is part of — Anchor windlass. A stopper.
2. Step 2. Anchor windlass — uses — Anchor. It raises the anchor.
3. Step 3. Anchor — is part of — Sailing ship. An anchor.
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 — Telescope. An objective and an eyepiece.

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