Electrical telegraph and needle: what they have in common

1. Step 1. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.
2. Step 2. Optical telegraph — uses — Lens. Signals were read through telescopes.
3. Step 3. Lens — is part of — Cinématographe. A lens.
4. Step 4. 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.
5. Step 5. Sewing machine — has part — Needle. A needle with the eye near its point.

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