Davy lamp and monitor: what they have in common

1. Step 1. Davy lamp — has part — Wick. A wick.
2. Step 2. Wick — is part of — Lighter. Petrol lighters have a wick.
3. Step 3. Lighter — uses — Piezoelectric effect. Piezo lighters.
4. Step 4. Piezoelectric effect — is used in — Ultrasound scanner. A piezo transducer.
5. Step 5. Ultrasound scanner — has part — Monitor. A screen.

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