Cone-shaped paper filter e electrical telegraph: o que têm em comum

1. Passo 1. Cone-shaped paper filter — faz parte de — Filtro de café. Pleats shaped like a funnel.
2. Passo 2. Filtro de café — funciona como — Water filter. Filtering a liquid through a porous medium.
3. Passo 3. Water filter — é feito de — Silica (sand). Slow filters are layers of sand and gravel.
4. Passo 4. Silica (sand) — é material para — Internet. The backbones are silica optical fibre.
5. Passo 5. Internet — utiliza — Packet switching. Data is sent in packets.
6. Passo 6. Packet switching — funciona como — Electrical telegraph. An analogy: telegraph messages were passed from station to station with intermediate storage — a “store and forward” principle similar to packet transmission.

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