Lens replacement and hammer: what they have in common

1. Step 1. Lens replacement — uses — Lens. An artificial lens is a lens.
2. Step 2. Lens — is part of — Cinématographe. A lens.
3. Step 3. Cinématographe — was inspired by — Sewing machine. Louis Lumière said he came up with the intermittent film feed while watching the fabric feed of a sewing machine.
4. Step 4. Sewing machine — has part — Cam. Cams drive the fabric feed.
5. Step 5. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
6. Step 6. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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