Gauge needle and dial und telephone: was sie gemeinsam haben

1. Schritt 1. Gauge needle and dial — ist Teil von — Hygrometer. It shows the humidity.
2. Schritt 2. Hygrometer — ist Teil von — Weather station. A hygrometer.
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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