Roller mill and telescope: what they have in common

1. Step 1. Roller mill — uses — Belt drive. A belt drive to the roller mills.
2. Step 2. Belt drive — is part of — Spinning wheel. The wheel is linked to the spindle by a cord.
3. Step 3. Spinning wheel — has part — Crank. A foot drive through a crank.
4. Step 4. Crank — is part of — Cinématographe. The film was advanced by turning a handle.
5. Step 5. Cinématographe — has part — Lens. A lens.
6. Step 6. Lens — is part of — Telescope. An objective and an eyepiece.

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