Tear de cintura e optical telegraph: o que têm em comum

1. Passo 1. Tear de cintura — utiliza — Plant fibre. Cloth is woven from threads spun from fibres.
2. Passo 2. Plant fibre — é material para — Hygrometer. Humidity was shown by a fibre that changed length.
3. Passo 3. Hygrometer — faz parte de — Weather station. A hygrometer.
4. Passo 4. Weather station — é utilizado em — Weather forecast. Observations.
5. Passo 5. Weather forecast — utiliza — Electrical telegraph. Collecting reports by telegraph.
6. Passo 6. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.

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