Kartesisches Koordinatensystem und telephone: was sie gemeinsam haben

1. Schritt 1. Kartesisches Koordinatensystem — nutzt — Euclidean geometry. Analytic geometry.
2. Schritt 2. Euclidean geometry — wird verwendet in — Weather station. Instruments are set up on a site according to a standard.
3. Schritt 3. Weather station — wird verwendet in — Weather forecast. Observations.
4. Schritt 4. Weather forecast — nutzt — Electrical telegraph. Collecting reports by telegraph.
5. Schritt 5. Electrical telegraph — entwickelte sich zu — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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