Coordenadas cartesianas e telephone: o que têm em comum

1. Passo 1. Coordenadas cartesianas — utiliza — Euclidean geometry. Analytic geometry.
2. Passo 2. Euclidean geometry — é utilizado em — Weather station. Instruments are set up on a site according to a standard.
3. Passo 3. Weather station — é utilizado em — Weather forecast. Observations.
4. Passo 4. Weather forecast — utiliza — Electrical telegraph. Collecting reports by telegraph.
5. Passo 5. 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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