Lighter and electrical telegraph: what they have in common

1. Step 1. Lighter — uses — Piezoelectric effect. Piezo lighters.
2. Step 2. Piezoelectric effect — is used in — Microphone. Piezo microphones turn sound pressure into voltage.
3. Step 3. Microphone — is part of — Telephone. The handset microphone turns the voice into an electrical signal.
4. Step 4. Telephone — evolved from — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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