Máquina diferencial de Babbage e optical telegraph: o que têm em comum

1. Passo 1. Máquina diferencial de Babbage — evoluiu para — Máquina analítica de Babbage. Babbage moved on to a general-purpose machine while working on the difference engine.
2. Passo 2. Máquina analítica de Babbage — inspirou — Harvard Mark I. Howard Aiken named Babbage’s work as the source of his idea.
3. Passo 3. Harvard Mark I — tem como parte — Relay. The Mark I was electromechanical, built from relays.
4. Passo 4. Relay — faz parte de — Electrical telegraph. Relays boosted the signal on long lines.
5. Passo 5. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.

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