Stethoscope und watt steam engine: was sie gemeinsam haben

1. Schritt 1. Stethoscope — wird verwendet in — Blood pressure monitor. Listening for the Korotkov sounds.
2. Schritt 2. Blood pressure monitor — entwickelte sich aus — Manometer. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
3. Schritt 3. Manometer — ist Teil von — Dampfkessel. The gauge on a boiler shows the steam pressure — without it the boiler could explode.
4. Schritt 4. Dampfkessel — ist Teil von — Watt steam engine. The boiler supplies steam.

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