Calendar hanging clip e optical telegraph: o que têm em comum

1. Passo 1. Calendar hanging clip — faz parte de — Calendário de parede. A spring or a clip.
2. Passo 2. Calendário de parede — é feito de — Paper. Calendars were printed on paper.
3. Passo 3. Paper — é material para — Loudspeaker. The cone is paper.
4. Passo 4. Loudspeaker — faz parte de — Telephone. The earpiece reproduces the other person’s voice.
5. Passo 5. Telephone — evoluiu de — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
6. Passo 6. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.

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