Sailing ship and air conditioner: what they have in common

1. Step 1. Sailing ship — has part — Compass. A magnetic compass.
2. Step 2. Compass — works like — Hall sensor. Both sense the Earth’s magnetic field.
3. Step 3. Hall sensor — is part of — Anti-lock braking system (ABS). Sensors measure the wheel speed.
4. Step 4. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
5. Step 5. Air brake — has part — Compressor. A compressor pumps the air.
6. Step 6. Compressor — is part of — Air conditioner. A compressor.

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