Microwave cavity and gas lamp: what they have in common

1. Step 1. Microwave cavity — is part of — Atomic clock. It excites the 9.19 GHz transition.
2. Step 2. Atomic clock — evolved from — Quartz clock. The quartz oscillator is tuned to an atomic standard.
3. Step 3. Quartz clock — uses — Resonance. Resonance of the crystal.
4. Step 4. Resonance — is used in — Valve trumpet. Resonance of the tube.
5. Step 5. Valve trumpet — has part — Valve. Valves.
6. Step 6. Valve — is part of — Gas lamp. A gas supply valve.

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