Sewing machine and optical telegraph: what they have in common

1. Step 1. Sewing machine — inspired — Cinématographe. Louis Lumière said he came up with the intermittent film feed while watching the fabric feed of a sewing machine.
2. Step 2. Cinématographe — has part — Lens. A lens.
3. Step 3. Lens — is used in — Optical telegraph. Signals were read through telescopes.

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