Rotation mechanism and telescope: what they have in common

1. Step 1. Rotation mechanism — is part of — Lighthouse. It rotates the optics, setting the flash pattern.
2. Step 2. Lighthouse — is part of — Seaport. A lighthouse.
3. Step 3. Seaport — uses — Sailing ship. A port receives ships.
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.

Open Evothings