Sawmill and oil lamp: what they have in common

1. Step 1. Sawmill — has part — Crank. A crank turns the wheel’s rotation into the stroke of the saw.
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 — evolved from — Magic lantern. Projecting images from a transparent medium.
6. Step 6. Magic lantern — uses — Oil lamp. The light source is an oil lamp.

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