Escapement and electric fan: what they have in common

1. Step 1. Escapement — is part of — Pocket watch. The lever escapement links the balance and the wheel train.
2. Step 2. Pocket watch — evolved into — Marine chronometer. Harrison moved from large clocks to the pocket-sized H4.
3. Step 3. Marine chronometer — has part — Bimetallic strip. Harrison invented the bimetal strip to compensate for temperature.
4. Step 4. Bimetallic strip — is part of — Hair dryer. Overheating protection: when hot, a bimetallic strip bends and breaks the circuit.
5. Step 5. Hair dryer — has part — Impeller. An impeller on the motor shaft pushes air through the heater.
6. Step 6. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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