Tall wooden churn e internet: o que têm em comum

1. Passo 1. Tall wooden churn — faz parte de — Batedeira de manteiga. A tall narrow container.
2. Passo 2. Batedeira de manteiga — utiliza — Lever. A dasher.
3. Passo 3. Lever — é utilizado em — Optical telegraph. The arms were moved by a system of levers and rods.
4. Passo 4. Optical telegraph — evoluiu para — Electrical telegraph. The electrical telegraph replaced semaphore lines.
5. Passo 5. Electrical telegraph — funciona como — Packet switching. An analogy: telegraph messages were passed from station to station with intermediate storage — a “store and forward” principle similar to packet transmission.
6. Passo 6. Packet switching — é utilizado em — Internet. Data is sent in packets.

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