Electrocardiograph and davy lamp: what they have in common

1. Step 1. Electrocardiograph — has part — Amplifier. Biosignal amplifiers.
2. Step 2. Amplifier — includes — Hi-fi amplifier. An amplifier.
3. Step 3. Hi-fi amplifier — has part — Heat sink. Radiators carry away heat.
4. Step 4. Heat sink — uses — Heat transfer. Heat dissipation.
5. Step 5. Heat transfer — is used in — Davy lamp. The gauze draws off heat and stops the flame.

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