Electrical telegraph e needle: o que têm em comum

1. Passo 1. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.
2. Passo 2. Optical telegraph — utiliza — Lens. Signals were read through telescopes.
3. Passo 3. Lens — faz parte de — Cinematógrafo. A lens.
4. Passo 4. Cinematógrafo — foi inspirado por — Sewing machine. Louis Lumière said he came up with the intermittent film feed while watching the fabric feed of a sewing machine.
5. Passo 5. Sewing machine — tem como parte — Needle. A needle with the eye near its point.

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