Whistle edge and mechanical clock: what they have in common

1. Step 1. Whistle edge — is part of — Whistle. A sharp edge that splits the air stream.
2. Step 2. Whistle — uses — Resonance. Resonance of the chamber.
3. Step 3. Resonance — is used in — Quartz clock. Resonance of the crystal.
4. Step 4. Quartz clock — evolved from — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.

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