Needle and electrical telegraph: what they have in common

1. Step 1. Needle — is part of — Sewing machine. A needle with the eye near its point.
2. Step 2. Sewing machine — inspired — Cinématographe. Louis Lumière said he came up with the intermittent film feed while watching the fabric feed of a sewing machine.
3. Step 3. Cinématographe — has part — Lens. A lens.
4. Step 4. Lens — is used in — Optical telegraph. Signals were read through telescopes.
5. Step 5. Optical telegraph — evolved into — Electrical telegraph. The electrical telegraph replaced semaphore lines.

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