Reflex hammer and atomic clock: what they have in common

1. Step 1. Reflex hammer — is made of — Vulcanized rubber. A rubber head.
2. Step 2. Vulcanized rubber — is material for — Weather balloon. The envelope is rubber or latex.
3. Step 3. Weather balloon — has part — Radio. A radiosonde.
4. Step 4. Radio — has part — Oscillator. A carrier frequency oscillator.
5. Step 5. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.

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