Hierapolis sawmill and incandescent light bulb: what they have in common

1. Step 1. Hierapolis sawmill — has part — Crank. A crank and connecting rod mechanism.
2. Step 2. Crank — is part of — Cinématographe. The film was advanced by turning a handle.
3. Step 3. Cinématographe — uses — Photographic film. Perforated film.
4. Step 4. Photographic film — is used in — Film projector. It shows film.
5. Step 5. Film projector — has part — Incandescent light bulb. The light source (formerly an arc).

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