Drais’s running machine and optical telegraph: what they have in common

1. Step 1. Drais’s running machine — evolved into — Michaux velocipede. Michaux added pedals to the front wheel.
2. Step 2. Michaux velocipede — has part — Crank. Cranks on the wheel axle.
3. Step 3. Crank — is part of — Cinématographe. The film was advanced by turning a handle.
4. Step 4. Cinématographe — has part — Lens. A lens.
5. Step 5. Lens — is used in — Optical telegraph. Signals were read through telescopes.

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