Carved stone cylinder e electrical telegraph: o que têm em comum

1. Passo 1. Carved stone cylinder — faz parte de — Selo cilíndrico. A stone with a carved image.
2. Passo 2. Selo cilíndrico — funciona como — Gutenberg printing press. An analogy: both a seal and a press reproduce a pre-carved pattern.
3. Passo 3. Gutenberg printing press — utiliza — Paper. The impression is made on paper.
4. Passo 4. Paper — é material para — Loudspeaker. The cone is paper.
5. Passo 5. Loudspeaker — faz parte de — Telephone. The earpiece reproduces the other person’s voice.
6. Passo 6. Telephone — evoluiu de — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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