Draft tube e telephone: o que têm em comum

1. Passo 1. Draft tube — faz parte de — Water turbine. It carries away water and recovers some of the energy.
2. Passo 2. Water turbine — faz parte de — Hydroelectric power station. Water turbines.
3. Passo 3. Hydroelectric power station — tem como parte — Electric generator. Generators.
4. Passo 4. Electric generator — tem como parte — Fio de cobre. Windings.
5. Passo 5. Fio de cobre — faz parte de — Electrical telegraph. Communication lines.
6. Passo 6. Electrical telegraph — evoluiu para — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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