Pocket watch and refrigerator: what they have in common

1. Step 1. Pocket watch — evolved into — Marine chronometer. Harrison moved from large clocks to the pocket-sized H4.
2. Step 2. Marine chronometer — has part — Bimetallic strip. Harrison invented the bimetal strip to compensate for temperature.
3. Step 3. Bimetallic strip — is part of — Thermostat. A classic thermostat is bimetallic.
4. Step 4. Thermostat — is part of — Refrigerator. A thermostat.

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